/*
- * Copyright (c) 200
6-2009, Salvatore Sanfilippo <antirez at gmail dot com>
+ * Copyright (c) 200
9-2010, Salvatore Sanfilippo <antirez at gmail dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* POSSIBILITY OF SUCH DAMAGE.
*/
-#define REDIS_VERSION "1.3.2"
+#define REDIS_VERSION "1.3.4"
#include "fmacros.h"
#include "config.h"
#include <time.h>
#include <unistd.h>
#define __USE_POSIX199309
+#define __USE_UNIX98
#include <signal.h>
#ifdef HAVE_BACKTRACE
#include "zmalloc.h" /* total memory usage aware version of malloc/free */
#include "lzf.h" /* LZF compression library */
#include "pqsort.h" /* Partial qsort for SORT+LIMIT */
+#include "zipmap.h"
/* Error codes */
#define REDIS_OK 0
#define REDIS_ZSET 3
#define REDIS_HASH 4
-/* Objects encoding */
+/* Objects encoding. Some kind of objects like Strings and Hashes can be
+ * internally represented in multiple ways. The 'encoding' field of the object
+ * is set to one of this fields for this object. */
#define REDIS_ENCODING_RAW 0 /* Raw representation */
#define REDIS_ENCODING_INT 1 /* Encoded as integer */
+#define REDIS_ENCODING_ZIPMAP 2 /* Encoded as zipmap */
+#define REDIS_ENCODING_HT 3 /* Encoded as an hash table */
/* Object types only used for dumping to disk */
#define REDIS_EXPIRETIME 253
#define REDIS_VM_MAX_NEAR_PAGES 65536
#define REDIS_VM_MAX_RANDOM_JUMP 4096
#define REDIS_VM_MAX_THREADS 32
+#define REDIS_THREAD_STACK_SIZE (1024*1024*4)
+/* The following is the *percentage* of completed I/O jobs to process when the
+ * handelr is called. While Virtual Memory I/O operations are performed by
+ * threads, this operations must be processed by the main thread when completed
+ * in order to take effect. */
+#define REDIS_MAX_COMPLETED_JOBS_PROCESSED 1
/* Client flags */
-#define REDIS_CLOSE 1 /* This client connection should be closed ASAP */
-#define REDIS_SLAVE 2 /* This client is a slave server */
-#define REDIS_MASTER 4 /* This client is a master server */
-#define REDIS_MONITOR 8 /* This client is a slave monitor, see MONITOR */
-#define REDIS_MULTI 16 /* This client is in a MULTI context */
-#define REDIS_BLOCKED 32 /* The client is waiting in a blocking operation */
-#define REDIS_IO_WAIT 64 /* The client is waiting for Virtual Memory I/O */
+#define REDIS_SLAVE 1 /* This client is a slave server */
+#define REDIS_MASTER 2 /* This client is a master server */
+#define REDIS_MONITOR 4 /* This client is a slave monitor, see MONITOR */
+#define REDIS_MULTI 8 /* This client is in a MULTI context */
+#define REDIS_BLOCKED 16 /* The client is waiting in a blocking operation */
+#define REDIS_IO_WAIT 32 /* The client is waiting for Virtual Memory I/O */
/* Slave replication state - slave side */
#define REDIS_REPL_NONE 0 /* No active replication */
#define APPENDFSYNC_EVERYSEC 2
/* We can print the stacktrace, so our assert is defined this way: */
-#define redisAssert(_e) ((_e)?(void)0 : (_redisAssert(#_e),exit(1)))
-static void _redisAssert(char *estr);
+#define redisAssert(_e) ((_e)?(void)0 : (_redisAssert(#_e,__FILE__,__LINE__),_exit(1)))
+static void _redisAssert(char *estr, char *file, int line);
/*================================= Data types ============================== */
dict *dict; /* The keyspace for this DB */
dict *expires; /* Timeout of keys with a timeout set */
dict *blockingkeys; /* Keys with clients waiting for data (BLPOP) */
+ dict *io_keys; /* Keys with clients waiting for VM I/O */
int id;
} redisDb;
list *reply;
int sentlen;
time_t lastinteraction; /* time of the last interaction, used for timeout */
- int flags; /* REDIS_CLOSE | REDIS_SLAVE | REDIS_MONITOR */
- /* REDIS_MULTI */
+ int flags; /* REDIS_SLAVE | REDIS_MONITOR | REDIS_MULTI ... */
int slaveseldb; /* slave selected db, if this client is a slave */
int authenticated; /* when requirepass is non-NULL */
int replstate; /* replication state if this is a slave */
long repldboff; /* replication DB file offset */
off_t repldbsize; /* replication DB file size */
multiState mstate; /* MULTI/EXEC state */
- robj **blockingkeys; /* The key we waiting to terminate a blocking
+ robj **blockingkeys; /* The key we are waiting to terminate a blocking
* operation such as BLPOP. Otherwise NULL. */
int blockingkeysnum; /* Number of blocking keys */
time_t blockingto; /* Blocking operation timeout. If UNIX current time
int cronloops; /* number of times the cron function run */
list *objfreelist; /* A list of freed objects to avoid malloc() */
time_t lastsave; /* Unix time of last save succeeede */
- size_t usedmemory; /* Used memory in megabytes */
/* Fields used only for stats */
time_t stat_starttime; /* server start time */
long long stat_numcommands; /* number of processed commands */
int replstate;
unsigned int maxclients;
unsigned long long maxmemory;
- unsigned int blockedclients;
+ unsigned int blpop_blocked_clients;
+ unsigned int vm_blocked_clients;
/* Sort parameters - qsort_r() is only available under BSD so we
* have to take this state global, in order to pass it to sortCompare() */
int sort_desc;
int sort_bypattern;
/* Virtual memory configuration */
int vm_enabled;
+ char *vm_swap_file;
off_t vm_page_size;
off_t vm_pages;
unsigned long long vm_max_memory;
list *io_newjobs; /* List of VM I/O jobs yet to be processed */
list *io_processing; /* List of VM I/O jobs being processed */
list *io_processed; /* List of VM I/O jobs already processed */
- list *io_clients; /* All the clients waiting for SWAP I/O operations */
+ list *io_ready_clients; /* Clients ready to be unblocked. All keys loaded */
pthread_mutex_t io_mutex; /* lock to access io_jobs/io_done/io_thread_job */
+ pthread_mutex_t obj_freelist_mutex; /* safe redis objects creation/free */
+ pthread_mutex_t io_swapfile_mutex; /* So we can lseek + write */
+ pthread_attr_t io_threads_attr; /* attributes for threads creation */
int io_active_threads; /* Number of running I/O threads */
int vm_max_threads; /* Max number of I/O threads running at the same time */
/* Our main thread is blocked on the event loop, locking for sockets ready
redisCommandProc *proc;
int arity;
int flags;
+ /* What keys should be loaded in background when calling this command? */
+ int vm_firstkey; /* The first argument that's a key (0 = no keys) */
+ int vm_lastkey; /* THe last argument that's a key */
+ int vm_keystep; /* The step between first and last key */
};
struct redisFunctionSym {
typedef struct zskiplistNode {
struct zskiplistNode **forward;
struct zskiplistNode *backward;
+ unsigned int *span;
double score;
robj *obj;
} zskiplistNode;
#define REDIS_IOJOB_LOAD 0 /* Load from disk to memory */
#define REDIS_IOJOB_PREPARE_SWAP 1 /* Compute needed pages */
#define REDIS_IOJOB_DO_SWAP 2 /* Swap from memory to disk */
-typedef struct iojon {
+typedef struct iojob {
int type; /* Request type, REDIS_IOJOB_* */
redisDb *db;/* Redis database */
robj *key; /* This I/O request is about swapping this key */
static void initClientMultiState(redisClient *c);
static void freeClientMultiState(redisClient *c);
static void queueMultiCommand(redisClient *c, struct redisCommand *cmd);
-static void unblockClient(redisClient *c);
+static void unblockClientWaitingData(redisClient *c);
static int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele);
static void vmInit(void);
static void vmMarkPagesFree(off_t page, off_t count);
static int vmSwapOneObjectBlocking(void);
static int vmSwapOneObjectThreaded(void);
static int vmCanSwapOut(void);
-static void freeOneObjectFromFreelist(void);
+static int tryFreeOneObjectFromFreelist(void);
static void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask);
static void vmThreadedIOCompletedJob(aeEventLoop *el, int fd, void *privdata, int mask);
static void vmCancelThreadedIOJob(robj *o);
static int vmSwapObjectThreaded(robj *key, robj *val, redisDb *db);
static void freeIOJob(iojob *j);
static void queueIOJob(iojob *j);
+static int vmWriteObjectOnSwap(robj *o, off_t page);
+static robj *vmReadObjectFromSwap(off_t page, int type);
+static void waitEmptyIOJobsQueue(void);
+static void vmReopenSwapFile(void);
+static int vmFreePage(off_t page);
+static int blockClientOnSwappedKeys(struct redisCommand *cmd, redisClient *c);
+static int dontWaitForSwappedKey(redisClient *c, robj *key);
+static void handleClientsBlockedOnSwappedKey(redisDb *db, robj *key);
+static void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask);
+static struct redisCommand *lookupCommand(char *name);
+static void call(redisClient *c, struct redisCommand *cmd);
+static void resetClient(redisClient *c);
static void authCommand(redisClient *c);
static void pingCommand(redisClient *c);
static void zincrbyCommand(redisClient *c);
static void zrangeCommand(redisClient *c);
static void zrangebyscoreCommand(redisClient *c);
+static void zcountCommand(redisClient *c);
static void zrevrangeCommand(redisClient *c);
static void zcardCommand(redisClient *c);
static void zremCommand(redisClient *c);
static void zremrangebyscoreCommand(redisClient *c);
static void multiCommand(redisClient *c);
static void execCommand(redisClient *c);
+static void discardCommand(redisClient *c);
static void blpopCommand(redisClient *c);
static void brpopCommand(redisClient *c);
+static void appendCommand(redisClient *c);
+static void substrCommand(redisClient *c);
+static void zrankCommand(redisClient *c);
+static void hsetCommand(redisClient *c);
+static void hgetCommand(redisClient *c);
/*================================= Globals ================================= */
/* Global vars */
static struct redisServer server; /* server global state */
static struct redisCommand cmdTable[] = {
- {"get",getCommand,2,REDIS_CMD_INLINE},
- {"set",setCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
- {"setnx",setnxCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
- {"del",delCommand,-2,REDIS_CMD_INLINE},
- {"exists",existsCommand,2,REDIS_CMD_INLINE},
- {"incr",incrCommand,2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
- {"decr",decrCommand,2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
- {"mget",mgetCommand,-2,REDIS_CMD_INLINE},
- {"rpush",rpushCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
- {"lpush",lpushCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
- {"rpop",rpopCommand,2,REDIS_CMD_INLINE},
- {"lpop",lpopCommand,2,REDIS_CMD_INLINE},
- {"brpop",brpopCommand,-3,REDIS_CMD_INLINE},
- {"blpop",blpopCommand,-3,REDIS_CMD_INLINE},
- {"llen",llenCommand,2,REDIS_CMD_INLINE},
- {"lindex",lindexCommand,3,REDIS_CMD_INLINE},
- {"lset",lsetCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
- {"lrange",lrangeCommand,4,REDIS_CMD_INLINE},
- {"ltrim",ltrimCommand,4,REDIS_CMD_INLINE},
- {"lrem",lremCommand,4,REDIS_CMD_BULK},
- {"rpoplpush",rpoplpushcommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
- {"sadd",saddCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
- {"srem",sremCommand,3,REDIS_CMD_BULK},
- {"smove",smoveCommand,4,REDIS_CMD_BULK},
- {"sismember",sismemberCommand,3,REDIS_CMD_BULK},
- {"scard",scardCommand,2,REDIS_CMD_INLINE},
- {"spop",spopCommand,2,REDIS_CMD_INLINE},
- {"srandmember",srandmemberCommand,2,REDIS_CMD_INLINE},
- {"sinter",sinterCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
- {"sinterstore",sinterstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
- {"sunion",sunionCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
- {"sunionstore",sunionstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
- {"sdiff",sdiffCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
- {"sdiffstore",sdiffstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
- {"smembers",sinterCommand,2,REDIS_CMD_INLINE},
- {"zadd",zaddCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
- {"zincrby",zincrbyCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
- {"zrem",zremCommand,3,REDIS_CMD_BULK},
- {"zremrangebyscore",zremrangebyscoreCommand,4,REDIS_CMD_INLINE},
- {"zrange",zrangeCommand,-4,REDIS_CMD_INLINE},
- {"zrangebyscore",zrangebyscoreCommand,-4,REDIS_CMD_INLINE},
- {"zrevrange",zrevrangeCommand,-4,REDIS_CMD_INLINE},
- {"zcard",zcardCommand,2,REDIS_CMD_INLINE},
- {"zscore",zscoreCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
- {"incrby",incrbyCommand,3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
- {"decrby",decrbyCommand,3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
- {"getset",getsetCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
- {"mset",msetCommand,-3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
- {"msetnx",msetnxCommand,-3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
- {"randomkey",randomkeyCommand,1,REDIS_CMD_INLINE},
- {"select",selectCommand,2,REDIS_CMD_INLINE},
- {"move",moveCommand,3,REDIS_CMD_INLINE},
- {"rename",renameCommand,3,REDIS_CMD_INLINE},
- {"renamenx",renamenxCommand,3,REDIS_CMD_INLINE},
- {"expire",expireCommand,3,REDIS_CMD_INLINE},
- {"expireat",expireatCommand,3,REDIS_CMD_INLINE},
- {"keys",keysCommand,2,REDIS_CMD_INLINE},
- {"dbsize",dbsizeCommand,1,REDIS_CMD_INLINE},
- {"auth",authCommand,2,REDIS_CMD_INLINE},
- {"ping",pingCommand,1,REDIS_CMD_INLINE},
- {"echo",echoCommand,2,REDIS_CMD_BULK},
- {"save",saveCommand,1,REDIS_CMD_INLINE},
- {"bgsave",bgsaveCommand,1,REDIS_CMD_INLINE},
- {"bgrewriteaof",bgrewriteaofCommand,1,REDIS_CMD_INLINE},
- {"shutdown",shutdownCommand,1,REDIS_CMD_INLINE},
- {"lastsave",lastsaveCommand,1,REDIS_CMD_INLINE},
- {"type",typeCommand,2,REDIS_CMD_INLINE},
- {"multi",multiCommand,1,REDIS_CMD_INLINE},
- {"exec",execCommand,1,REDIS_CMD_INLINE},
- {"sync",syncCommand,1,REDIS_CMD_INLINE},
- {"flushdb",flushdbCommand,1,REDIS_CMD_INLINE},
- {"flushall",flushallCommand,1,REDIS_CMD_INLINE},
- {"sort",sortCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
- {"info",infoCommand,1,REDIS_CMD_INLINE},
- {"monitor",monitorCommand,1,REDIS_CMD_INLINE},
- {"ttl",ttlCommand,2,REDIS_CMD_INLINE},
- {"slaveof",slaveofCommand,3,REDIS_CMD_INLINE},
- {"debug",debugCommand,-2,REDIS_CMD_INLINE},
- {NULL,NULL,0,0}
+ {"get",getCommand,2,REDIS_CMD_INLINE,1,1,1},
+ {"set",setCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,0,0,0},
+ {"setnx",setnxCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,0,0,0},
+ {"append",appendCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,1,1,1},
+ {"substr",substrCommand,4,REDIS_CMD_INLINE,1,1,1},
+ {"del",delCommand,-2,REDIS_CMD_INLINE,0,0,0},
+ {"exists",existsCommand,2,REDIS_CMD_INLINE,1,1,1},
+ {"incr",incrCommand,2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM,1,1,1},
+ {"decr",decrCommand,2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM,1,1,1},
+ {"mget",mgetCommand,-2,REDIS_CMD_INLINE,1,-1,1},
+ {"rpush",rpushCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,1,1,1},
+ {"lpush",lpushCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,1,1,1},
+ {"rpop",rpopCommand,2,REDIS_CMD_INLINE,1,1,1},
+ {"lpop",lpopCommand,2,REDIS_CMD_INLINE,1,1,1},
+ {"brpop",brpopCommand,-3,REDIS_CMD_INLINE,1,1,1},
+ {"blpop",blpopCommand,-3,REDIS_CMD_INLINE,1,1,1},
+ {"llen",llenCommand,2,REDIS_CMD_INLINE,1,1,1},
+ {"lindex",lindexCommand,3,REDIS_CMD_INLINE,1,1,1},
+ {"lset",lsetCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,1,1,1},
+ {"lrange",lrangeCommand,4,REDIS_CMD_INLINE,1,1,1},
+ {"ltrim",ltrimCommand,4,REDIS_CMD_INLINE,1,1,1},
+ {"lrem",lremCommand,4,REDIS_CMD_BULK,1,1,1},
+ {"rpoplpush",rpoplpushcommand,3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM,1,2,1},
+ {"sadd",saddCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,1,1,1},
+ {"srem",sremCommand,3,REDIS_CMD_BULK,1,1,1},
+ {"smove",smoveCommand,4,REDIS_CMD_BULK,1,2,1},
+ {"sismember",sismemberCommand,3,REDIS_CMD_BULK,1,1,1},
+ {"scard",scardCommand,2,REDIS_CMD_INLINE,1,1,1},
+ {"spop",spopCommand,2,REDIS_CMD_INLINE,1,1,1},
+ {"srandmember",srandmemberCommand,2,REDIS_CMD_INLINE,1,1,1},
+ {"sinter",sinterCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM,1,-1,1},
+ {"sinterstore",sinterstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM,2,-1,1},
+ {"sunion",sunionCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM,1,-1,1},
+ {"sunionstore",sunionstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM,2,-1,1},
+ {"sdiff",sdiffCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM,1,-1,1},
+ {"sdiffstore",sdiffstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM,2,-1,1},
+ {"smembers",sinterCommand,2,REDIS_CMD_INLINE,1,1,1},
+ {"zadd",zaddCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,1,1,1},
+ {"zincrby",zincrbyCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,1,1,1},
+ {"zrem",zremCommand,3,REDIS_CMD_BULK,1,1,1},
+ {"zremrangebyscore",zremrangebyscoreCommand,4,REDIS_CMD_INLINE,1,1,1},
+ {"zrange",zrangeCommand,-4,REDIS_CMD_INLINE,1,1,1},
+ {"zrangebyscore",zrangebyscoreCommand,-4,REDIS_CMD_INLINE,1,1,1},
+ {"zcount",zcountCommand,4,REDIS_CMD_INLINE,1,1,1},
+ {"zrevrange",zrevrangeCommand,-4,REDIS_CMD_INLINE,1,1,1},
+ {"zcard",zcardCommand,2,REDIS_CMD_INLINE,1,1,1},
+ {"zscore",zscoreCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,1,1,1},
+ {"zrank",zrankCommand,3,REDIS_CMD_INLINE,1,1,1},
+ {"hset",hsetCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,1,1,1},
+ {"hget",hgetCommand,3,REDIS_CMD_BULK,1,1,1},
+ {"incrby",incrbyCommand,3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM,1,1,1},
+ {"decrby",decrbyCommand,3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM,1,1,1},
+ {"getset",getsetCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,1,1,1},
+ {"mset",msetCommand,-3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,1,-1,2},
+ {"msetnx",msetnxCommand,-3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,1,-1,2},
+ {"randomkey",randomkeyCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"select",selectCommand,2,REDIS_CMD_INLINE,0,0,0},
+ {"move",moveCommand,3,REDIS_CMD_INLINE,1,1,1},
+ {"rename",renameCommand,3,REDIS_CMD_INLINE,1,1,1},
+ {"renamenx",renamenxCommand,3,REDIS_CMD_INLINE,1,1,1},
+ {"expire",expireCommand,3,REDIS_CMD_INLINE,0,0,0},
+ {"expireat",expireatCommand,3,REDIS_CMD_INLINE,0,0,0},
+ {"keys",keysCommand,2,REDIS_CMD_INLINE,0,0,0},
+ {"dbsize",dbsizeCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"auth",authCommand,2,REDIS_CMD_INLINE,0,0,0},
+ {"ping",pingCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"echo",echoCommand,2,REDIS_CMD_BULK,0,0,0},
+ {"save",saveCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"bgsave",bgsaveCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"bgrewriteaof",bgrewriteaofCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"shutdown",shutdownCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"lastsave",lastsaveCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"type",typeCommand,2,REDIS_CMD_INLINE,1,1,1},
+ {"multi",multiCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"exec",execCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"discard",discardCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"sync",syncCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"flushdb",flushdbCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"flushall",flushallCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"sort",sortCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM,1,1,1},
+ {"info",infoCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"monitor",monitorCommand,1,REDIS_CMD_INLINE,0,0,0},
+ {"ttl",ttlCommand,2,REDIS_CMD_INLINE,1,1,1},
+ {"slaveof",slaveofCommand,3,REDIS_CMD_INLINE,0,0,0},
+ {"debug",debugCommand,-2,REDIS_CMD_INLINE,0,0,0},
+ {NULL,NULL,0,0,0,0,0}
};
/*============================ Utility functions ============================ */
va_start(ap, fmt);
if (level >= server.verbosity) {
- char *c = ".-*";
+ char *c = ".-*#";
char buf[64];
time_t now;
now = time(NULL);
strftime(buf,64,"%d %b %H:%M:%S",localtime(&now));
- fprintf(fp,"%s %c ",buf,c[level]);
+ fprintf(fp,"[%d] %s %c ",(int)getpid(),buf,c[level]);
vfprintf(fp, fmt, ap);
fprintf(fp,"\n");
fflush(fp);
static unsigned int dictEncObjHash(const void *key) {
robj *o = (robj*) key;
- o = getDecodedObject(o);
- unsigned int hash = dictGenHashFunction(o->ptr, sdslen((sds)o->ptr));
- decrRefCount(o);
- return hash;
+ if (o->encoding == REDIS_ENCODING_RAW) {
+ return dictGenHashFunction(o->ptr, sdslen((sds)o->ptr));
+ } else {
+ if (o->encoding == REDIS_ENCODING_INT) {
+ char buf[32];
+ int len;
+
+ len = snprintf(buf,32,"%ld",(long)o->ptr);
+ return dictGenHashFunction((unsigned char*)buf, len);
+ } else {
+ unsigned int hash;
+
+ o = getDecodedObject(o);
+ hash = dictGenHashFunction(o->ptr, sdslen((sds)o->ptr));
+ decrRefCount(o);
+ return hash;
+ }
+ }
}
+/* Sets type and expires */
static dictType setDictType = {
dictEncObjHash, /* hash function */
NULL, /* key dup */
NULL /* val destructor */
};
+/* Sorted sets hash (note: a skiplist is used in addition to the hash table) */
static dictType zsetDictType = {
dictEncObjHash, /* hash function */
NULL, /* key dup */
dictVanillaFree /* val destructor of malloc(sizeof(double)) */
};
-static dictType hashDictType = {
+/* Db->dict */
+static dictType dbDictType = {
dictObjHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictRedisObjectDestructor /* val destructor */
};
+/* Db->expires */
+static dictType keyptrDictType = {
+ dictObjHash, /* hash function */
+ NULL, /* key dup */
+ NULL, /* val dup */
+ dictObjKeyCompare, /* key compare */
+ dictRedisObjectDestructor, /* key destructor */
+ NULL /* val destructor */
+};
+
+/* Hash type hash table (note that small hashes are represented with zimpaps) */
+static dictType hashDictType = {
+ dictEncObjHash, /* hash function */
+ NULL, /* key dup */
+ NULL, /* val dup */
+ dictEncObjKeyCompare, /* key compare */
+ dictRedisObjectDestructor, /* key destructor */
+ dictRedisObjectDestructor /* val destructor */
+};
+
/* Keylist hash table type has unencoded redis objects as keys and
- * lists as values. It's used for blocking operations (BLPOP) */
+ * lists as values. It's used for blocking operations (BLPOP) and to
+ * map swapped keys to a list of clients waiting for this keys to be loaded. */
static dictType keylistDictType = {
dictObjHash, /* hash function */
NULL, /* key dup */
redisClient *c;
listNode *ln;
time_t now = time(NULL);
+ listIter li;
- listRewind(server.clients);
- while ((ln = listYield(server.clients)) != NULL) {
+ listRewind(server.clients,&li);
+ while ((ln = listNext(&li)) != NULL) {
c = listNodeValue(ln);
if (server.maxidletime &&
!(c->flags & REDIS_SLAVE) && /* no timeout for slaves */
} else if (c->flags & REDIS_BLOCKED) {
if (c->blockingto != 0 && c->blockingto < now) {
addReply(c,shared.nullmultibulk);
- unblockClient(c);
+ unblockClientWaitingData(c);
}
}
}
* To access a global var is faster than calling time(NULL) */
server.unixtime = time(NULL);
- /* Update the global state with the amount of used memory */
- server.usedmemory = zmalloc_used_memory();
-
/* Show some info about non-empty databases */
for (j = 0; j < server.dbnum; j++) {
long long size, used, vkeys;
redisLog(REDIS_VERBOSE,"%d clients connected (%d slaves), %zu bytes in use, %d shared objects",
listLength(server.clients)-listLength(server.slaves),
listLength(server.slaves),
- server.usedmemory,
+ zmalloc_used_memory(),
dictSize(server.sharingpool));
}
/* Close connections of timedout clients */
- if ((server.maxidletime && !(loops % 10)) || server.blockedclients)
+ if ((server.maxidletime && !(loops % 10)) || server.blpop_blocked_clients)
closeTimedoutClients();
/* Check if a background saving or AOF rewrite in progress terminated */
while (server.vm_enabled && zmalloc_used_memory() >
server.vm_max_memory)
{
- if (listLength(server.objfreelist)) {
- freeOneObjectFromFreelist();
- } else {
- if (vmSwapOneObjectThreaded() == REDIS_ERR) {
- if ((loops % 30) == 0 && zmalloc_used_memory() >
- (server.vm_max_memory+server.vm_max_memory/10)) {
- redisLog(REDIS_WARNING,"WARNING: vm-max-memory limit exceeded by more than 10%% but unable to swap more objects out!");
- }
- }
- /* Note that we freed just one object, because anyway when
- * the I/O thread in charge to swap this object out will
- * do its work, the handler of completed jobs will try to swap
- * more objects if we are out of memory. */
- break;
+ int retval;
+
+ if (tryFreeOneObjectFromFreelist() == REDIS_OK) continue;
+ retval = (server.vm_max_threads == 0) ?
+ vmSwapOneObjectBlocking() :
+ vmSwapOneObjectThreaded();
+ if (retval == REDIS_ERR && (loops % 30) == 0 &&
+ zmalloc_used_memory() >
+ (server.vm_max_memory+server.vm_max_memory/10))
+ {
+ redisLog(REDIS_WARNING,"WARNING: vm-max-memory limit exceeded by more than 10%% but unable to swap more objects out!");
}
+ /* Note that when using threade I/O we free just one object,
+ * because anyway when the I/O thread in charge to swap this
+ * object out will finish, the handler of completed jobs
+ * will try to swap more objects if we are still out of memory. */
+ if (retval == REDIS_ERR || server.vm_max_threads > 0) break;
}
}
return 1000;
}
+/* This function gets called every time Redis is entering the
+ * main loop of the event driven library, that is, before to sleep
+ * for ready file descriptors. */
+static void beforeSleep(struct aeEventLoop *eventLoop) {
+ REDIS_NOTUSED(eventLoop);
+
+ if (server.vm_enabled && listLength(server.io_ready_clients)) {
+ listIter li;
+ listNode *ln;
+
+ listRewind(server.io_ready_clients,&li);
+ while((ln = listNext(&li))) {
+ redisClient *c = ln->value;
+ struct redisCommand *cmd;
+
+ /* Resume the client. */
+ listDelNode(server.io_ready_clients,ln);
+ c->flags &= (~REDIS_IO_WAIT);
+ server.vm_blocked_clients--;
+ aeCreateFileEvent(server.el, c->fd, AE_READABLE,
+ readQueryFromClient, c);
+ cmd = lookupCommand(c->argv[0]->ptr);
+ assert(cmd != NULL);
+ call(c,cmd);
+ resetClient(c);
+ /* There may be more data to process in the input buffer. */
+ if (c->querybuf && sdslen(c->querybuf) > 0)
+ processInputBuffer(c);
+ }
+ }
+}
+
static void createSharedObjects(void) {
shared.crlf = createObject(REDIS_STRING,sdsnew("\r\n"));
shared.ok = createObject(REDIS_STRING,sdsnew("+OK\r\n"));
server.rdbcompression = 1;
server.sharingpoolsize = 1024;
server.maxclients = 0;
- server.blockedclients = 0;
+ server.blpop_blocked_clients = 0;
server.maxmemory = 0;
server.vm_enabled = 0;
+ server.vm_swap_file = zstrdup("/tmp/redis-%p.vm");
server.vm_page_size = 256; /* 256 bytes per page */
server.vm_pages = 1024*1024*100; /* 104 millions of pages */
server.vm_max_memory = 1024LL*1024*1024*1; /* 1 GB of RAM */
server.vm_max_threads = 4;
+ server.vm_blocked_clients = 0;
resetServerSaveParams();
exit(1);
}
for (j = 0; j < server.dbnum; j++) {
- server.db[j].dict = dictCreate(&hashDictType,NULL);
- server.db[j].expires = dictCreate(&setDictType,NULL);
+ server.db[j].dict = dictCreate(&dbDictType,NULL);
+ server.db[j].expires = dictCreate(&keyptrDictType,NULL);
server.db[j].blockingkeys = dictCreate(&keylistDictType,NULL);
+ if (server.vm_enabled)
+ server.db[j].io_keys = dictCreate(&keylistDictType,NULL);
server.db[j].id = j;
}
server.cronloops = 0;
server.bgrewritebuf = sdsempty();
server.lastsave = time(NULL);
server.dirty = 0;
- server.usedmemory = 0;
server.stat_numcommands = 0;
server.stat_numconnections = 0;
server.stat_starttime = time(NULL);
goto loaderr;
}
} else if (!strcasecmp(argv[0],"requirepass") && argc == 2) {
- server.requirepass = zstrdup(argv[1]);
+ server.requirepass = zstrdup(argv[1]);
} else if (!strcasecmp(argv[0],"pidfile") && argc == 2) {
- server.pidfile = zstrdup(argv[1]);
+ server.pidfile = zstrdup(argv[1]);
} else if (!strcasecmp(argv[0],"dbfilename") && argc == 2) {
- server.dbfilename = zstrdup(argv[1]);
+ server.dbfilename = zstrdup(argv[1]);
} else if (!strcasecmp(argv[0],"vm-enabled") && argc == 2) {
if ((server.vm_enabled = yesnotoi(argv[1])) == -1) {
err = "argument must be 'yes' or 'no'"; goto loaderr;
}
+ } else if (!strcasecmp(argv[0],"vm-swap-file") && argc == 2) {
+ zfree(server.vm_swap_file);
+ server.vm_swap_file = zstrdup(argv[1]);
} else if (!strcasecmp(argv[0],"vm-max-memory") && argc == 2) {
server.vm_max_memory = strtoll(argv[1], NULL, 10);
} else if (!strcasecmp(argv[0],"vm-page-size") && argc == 2) {
listNode *ln;
/* Note that if the client we are freeing is blocked into a blocking
- * call, we have to set querybuf to NULL *before* to call unblockClient()
- * to avoid processInputBuffer() will get called. Also it is important
- * to remove the file events after this, because this call adds
- * the READABLE event. */
+ * call, we have to set querybuf to NULL *before* to call
+ * unblockClientWaitingData() to avoid processInputBuffer() will get
+ * called. Also it is important to remove the file events after
+ * this, because this call adds the READABLE event. */
sdsfree(c->querybuf);
c->querybuf = NULL;
if (c->flags & REDIS_BLOCKED)
- unblockClient(c);
+ unblockClientWaitingData(c);
aeDeleteFileEvent(server.el,c->fd,AE_READABLE);
aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
ln = listSearchKey(server.clients,c);
redisAssert(ln != NULL);
listDelNode(server.clients,ln);
- /* Remove from the list of clients waiting for VM operations */
- if (server.vm_enabled && listLength(c->io_keys)) {
- ln = listSearchKey(server.io_clients,c);
- if (ln) listDelNode(server.io_clients,ln);
- listRelease(c->io_keys);
+ /* Remove from the list of clients waiting for swapped keys */
+ if (c->flags & REDIS_IO_WAIT && listLength(c->io_keys) == 0) {
+ ln = listSearchKey(server.io_ready_clients,c);
+ if (ln) {
+ listDelNode(server.io_ready_clients,ln);
+ server.vm_blocked_clients--;
+ }
+ }
+ while (server.vm_enabled && listLength(c->io_keys)) {
+ ln = listFirst(c->io_keys);
+ dontWaitForSwappedKey(c,ln->value);
}
listRelease(c->io_keys);
/* Other cleanup */
int copylen = 0;
char buf[GLUEREPLY_UP_TO];
listNode *ln;
+ listIter li;
robj *o;
- listRewind(c->reply);
- while((ln = listYield(c->reply))) {
+ listRewind(c->reply,&li);
+ while((ln = listNext(&li))) {
int objlen;
o = ln->value;
freeClient(c);
return 0;
}
+
+ /* Now lookup the command and check ASAP about trivial error conditions
+ * such wrong arity, bad command name and so forth. */
cmd = lookupCommand(c->argv[0]->ptr);
if (!cmd) {
addReplySds(c,
resetClient(c);
return 1;
} else if (cmd->flags & REDIS_CMD_BULK && c->bulklen == -1) {
+ /* This is a bulk command, we have to read the last argument yet. */
int bulklen = atoi(c->argv[c->argc-1]->ptr);
decrRefCount(c->argv[c->argc-1]);
c->argc++;
c->querybuf = sdsrange(c->querybuf,c->bulklen,-1);
} else {
+ /* Otherwise return... there is to read the last argument
+ * from the socket. */
return 1;
}
}
}
/* Exec the command */
- if (c->flags & REDIS_MULTI && cmd->proc != execCommand) {
+ if (c->flags & REDIS_MULTI && cmd->proc != execCommand && cmd->proc != discardCommand) {
queueMultiCommand(c,cmd);
addReply(c,shared.queued);
} else {
+ if (server.vm_enabled && server.vm_max_threads > 0 &&
+ blockClientOnSwappedKeys(cmd,c)) return 1;
call(c,cmd);
}
/* Prepare the client for the next command */
- if (c->flags & REDIS_CLOSE) {
- freeClient(c);
- return 0;
- }
resetClient(c);
return 1;
}
static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int dictid, robj **argv, int argc) {
listNode *ln;
+ listIter li;
int outc = 0, j;
robj **outv;
/* (args*2)+1 is enough room for args, spaces, newlines */
* be sure to free objects if there is no slave in a replication state
* able to be feed with commands */
for (j = 0; j < outc; j++) incrRefCount(outv[j]);
- listRewind(slaves);
- while((ln = listYield(slaves))) {
+ listRewind(slaves,&li);
+ while((ln = listNext(&li))) {
redisClient *slave = ln->value;
/* Don't feed slaves that are still waiting for BGSAVE to start */
} else {
return;
}
- processInputBuffer(c);
+ if (!(c->flags & REDIS_BLOCKED))
+ processInputBuffer(c);
}
static int selectDb(redisClient *c, int id) {
static void *dupClientReplyValue(void *o) {
incrRefCount((robj*)o);
- return 0;
+ return o;
}
static redisClient *createClient(int fd) {
(unsigned long) strlen(buf),buf));
}
+static void addReplyLong(redisClient *c, long l) {
+ char buf[128];
+ size_t len;
+
+ len = snprintf(buf,sizeof(buf),":%ld\r\n",l);
+ addReplySds(c,sdsnewlen(buf,len));
+}
+
static void addReplyBulkLen(redisClient *c, robj *obj) {
size_t len;
static robj *createObject(int type, void *ptr) {
robj *o;
+ if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
if (listLength(server.objfreelist)) {
listNode *head = listFirst(server.objfreelist);
o = listNodeValue(head);
listDelNode(server.objfreelist,head);
+ if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
} else {
if (server.vm_enabled) {
+ pthread_mutex_unlock(&server.obj_freelist_mutex);
o = zmalloc(sizeof(*o));
} else {
o = zmalloc(sizeof(*o)-sizeof(struct redisObjectVM));
o->ptr = ptr;
o->refcount = 1;
if (server.vm_enabled) {
+ /* Note that this code may run in the context of an I/O thread
+ * and accessing to server.unixtime in theory is an error
+ * (no locks). But in practice this is safe, and even if we read
+ * garbage Redis will not fail, as it's just a statistical info */
o->vm.atime = server.unixtime;
o->storage = REDIS_VM_MEMORY;
}
return createObject(REDIS_SET,d);
}
+static robj *createHashObject(void) {
+ /* All the Hashes start as zipmaps. Will be automatically converted
+ * into hash tables if there are enough elements or big elements
+ * inside. */
+ unsigned char *zm = zipmapNew();
+ robj *o = createObject(REDIS_HASH,zm);
+ o->encoding = REDIS_ENCODING_ZIPMAP;
+ return o;
+}
+
static robj *createZsetObject(void) {
zset *zs = zmalloc(sizeof(*zs));
static void decrRefCount(void *obj) {
robj *o = obj;
- /* Object is swapped out, or in the process of being loaded. */
+ /* Object is a key of a swapped out value, or in the process of being
+ * loaded. */
if (server.vm_enabled &&
(o->storage == REDIS_VM_SWAPPED || o->storage == REDIS_VM_LOADING))
{
redisAssert(o->type == REDIS_STRING);
freeStringObject(o);
vmMarkPagesFree(o->vm.page,o->vm.usedpages);
+ pthread_mutex_lock(&server.obj_freelist_mutex);
if (listLength(server.objfreelist) > REDIS_OBJFREELIST_MAX ||
!listAddNodeHead(server.objfreelist,o))
zfree(o);
+ pthread_mutex_unlock(&server.obj_freelist_mutex);
server.vm_stats_swapped_objects--;
return;
}
case REDIS_HASH: freeHashObject(o); break;
default: redisAssert(0 != 0); break;
}
+ if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
if (listLength(server.objfreelist) > REDIS_OBJFREELIST_MAX ||
!listAddNodeHead(server.objfreelist,o))
zfree(o);
+ if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
}
}
/* Update the access time of the key for the aging algorithm. */
key->vm.atime = server.unixtime;
} else {
+ int notify = (key->storage == REDIS_VM_LOADING);
+
/* Our value was swapped on disk. Bring it at home. */
redisAssert(val == NULL);
val = vmLoadObject(key);
dictGetEntryVal(de) = val;
+
+ /* Clients blocked by the VM subsystem may be waiting for
+ * this key... */
+ if (notify) handleClientsBlockedOnSwappedKey(db,key);
}
}
return val;
static int rdbSaveStringObject(FILE *fp, robj *obj) {
int retval;
- if (obj->storage == REDIS_VM_MEMORY &&
- obj->encoding != REDIS_ENCODING_RAW)
- {
+ /* Avoid incr/decr ref count business when possible.
+ * This plays well with copy-on-write given that we are probably
+ * in a child process (BGSAVE). Also this makes sure key objects
+ * of swapped objects are not incRefCount-ed (an assert does not allow
+ * this in order to avoid bugs) */
+ if (obj->encoding != REDIS_ENCODING_RAW) {
obj = getDecodedObject(obj);
retval = rdbSaveStringObjectRaw(fp,obj);
decrRefCount(obj);
} else {
- /* This is a fast path when we are sure the object is not encoded.
- * Note that's any *faster* actually as we needed to add the conditional
- * but because this may happen in a background process we don't want
- * to touch the object fields with incr/decrRefCount in order to
- * preveny copy on write of pages.
- *
- * Also incrRefCount() will have a failing assert() if we try to call
- * it against an object with storage != REDIS_VM_MEMORY. */
retval = rdbSaveStringObjectRaw(fp,obj);
}
return retval;
} else if (o->type == REDIS_LIST) {
/* Save a list value */
list *list = o->ptr;
+ listIter li;
listNode *ln;
- listRewind(list);
if (rdbSaveLen(fp,listLength(list)) == -1) return -1;
- while((ln = listYield(list))) {
+ listRewind(list,&li);
+ while((ln = listNext(&li))) {
robj *eleobj = listNodeValue(ln);
if (rdbSaveStringObject(fp,eleobj) == -1) return -1;
int j;
time_t now = time(NULL);
+ /* Wait for I/O therads to terminate, just in case this is a
+ * foreground-saving, to avoid seeking the swap file descriptor at the
+ * same time. */
+ if (server.vm_enabled)
+ waitEmptyIOJobsQueue();
+
snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid());
fp = fopen(tmpfile,"w");
if (!fp) {
pid_t childpid;
if (server.bgsavechildpid != -1) return REDIS_ERR;
+ if (server.vm_enabled) waitEmptyIOJobsQueue();
if ((childpid = fork()) == 0) {
/* Child */
+ if (server.vm_enabled) vmReopenSwapFile();
close(server.fd);
if (rdbSave(filename) == REDIS_OK) {
- exit(0);
+ _exit(0);
} else {
- exit(1);
+ _exit(1);
}
} else {
/* Parent */
if ((listlen = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL;
o = (type == REDIS_LIST) ? createListObject() : createSetObject();
+ /* It's faster to expand the dict to the right size asap in order
+ * to avoid rehashing */
+ if (type == REDIS_SET && listlen > DICT_HT_INITIAL_SIZE)
+ dictExpand(o->ptr,listlen);
/* Load every single element of the list/set */
while(listlen--) {
robj *ele;
* to overwrite the old. So we delete the old key in the database.
* This will also make sure that swap pages about the old object
* will be marked as free. */
- if (deleteIfSwapped(c->db,c->argv[1]))
+ if (server.vm_enabled && deleteIfSwapped(c->db,c->argv[1]))
incrRefCount(c->argv[1]);
dictReplace(c->db->dict,c->argv[1],c->argv[2]);
incrRefCount(c->argv[2]);
incrDecrCommand(c,-incr);
}
+static void appendCommand(redisClient *c) {
+ int retval;
+ size_t totlen;
+ robj *o;
+
+ o = lookupKeyWrite(c->db,c->argv[1]);
+ if (o == NULL) {
+ /* Create the key */
+ retval = dictAdd(c->db->dict,c->argv[1],c->argv[2]);
+ incrRefCount(c->argv[1]);
+ incrRefCount(c->argv[2]);
+ totlen = stringObjectLen(c->argv[2]);
+ } else {
+ dictEntry *de;
+
+ de = dictFind(c->db->dict,c->argv[1]);
+ assert(de != NULL);
+
+ o = dictGetEntryVal(de);
+ if (o->type != REDIS_STRING) {
+ addReply(c,shared.wrongtypeerr);
+ return;
+ }
+ /* If the object is specially encoded or shared we have to make
+ * a copy */
+ if (o->refcount != 1 || o->encoding != REDIS_ENCODING_RAW) {
+ robj *decoded = getDecodedObject(o);
+
+ o = createStringObject(decoded->ptr, sdslen(decoded->ptr));
+ decrRefCount(decoded);
+ dictReplace(c->db->dict,c->argv[1],o);
+ }
+ /* APPEND! */
+ if (c->argv[2]->encoding == REDIS_ENCODING_RAW) {
+ o->ptr = sdscatlen(o->ptr,
+ c->argv[2]->ptr, sdslen(c->argv[2]->ptr));
+ } else {
+ o->ptr = sdscatprintf(o->ptr, "%ld",
+ (unsigned long) c->argv[2]->ptr);
+ }
+ totlen = sdslen(o->ptr);
+ }
+ server.dirty++;
+ addReplySds(c,sdscatprintf(sdsempty(),":%lu\r\n",(unsigned long)totlen));
+}
+
+static void substrCommand(redisClient *c) {
+ robj *o;
+ long start = atoi(c->argv[2]->ptr);
+ long end = atoi(c->argv[3]->ptr);
+
+ o = lookupKeyRead(c->db,c->argv[1]);
+ if (o == NULL) {
+ addReply(c,shared.nullbulk);
+ } else {
+ if (o->type != REDIS_STRING) {
+ addReply(c,shared.wrongtypeerr);
+ } else {
+ size_t rangelen, strlen;
+ sds range;
+
+ o = getDecodedObject(o);
+ strlen = sdslen(o->ptr);
+
+ /* convert negative indexes */
+ if (start < 0) start = strlen+start;
+ if (end < 0) end = strlen+end;
+ if (start < 0) start = 0;
+ if (end < 0) end = 0;
+
+ /* indexes sanity checks */
+ if (start > end || (size_t)start >= strlen) {
+ /* Out of range start or start > end result in null reply */
+ addReply(c,shared.nullbulk);
+ decrRefCount(o);
+ return;
+ }
+ if ((size_t)end >= strlen) end = strlen-1;
+ rangelen = (end-start)+1;
+
+ /* Return the result */
+ addReplySds(c,sdscatprintf(sdsempty(),"$%lu\r\n",rangelen));
+ range = sdsnewlen((char*)o->ptr+start,rangelen);
+ addReplySds(c,range);
+ addReply(c,shared.crlf);
+ decrRefCount(o);
+ }
+ }
+}
+
/* ========================= Type agnostic commands ========================= */
static void delCommand(redisClient *c) {
dictEntry *de;
sds pattern = c->argv[1]->ptr;
int plen = sdslen(pattern);
- unsigned long numkeys = 0, keyslen = 0;
+ unsigned long numkeys = 0;
robj *lenobj = createObject(REDIS_STRING,NULL);
di = dictGetIterator(c->db->dict);
if ((pattern[0] == '*' && pattern[1] == '\0') ||
stringmatchlen(pattern,plen,key,sdslen(key),0)) {
if (expireIfNeeded(c->db,keyobj) == 0) {
- if (numkeys != 0)
- addReply(c,shared.space);
+ addReplyBulkLen(c,keyobj);
addReply(c,keyobj);
+ addReply(c,shared.crlf);
numkeys++;
- keyslen += sdslen(key);
}
}
}
dictReleaseIterator(di);
- lenobj->ptr = sdscatprintf(sdsempty(),"$%lu\r\n",keyslen+(numkeys ? (numkeys-1) : 0));
- addReply(c,shared.crlf);
+ lenobj->ptr = sdscatprintf(sdsempty(),"*%lu\r\n",numkeys);
}
static void dbsizeCommand(redisClient *c) {
if (server.appendonly) {
/* Append only file: fsync() the AOF and exit */
fsync(server.appendfd);
+ if (server.vm_enabled) unlink(server.vm_swap_file);
exit(0);
} else {
/* Snapshotting. Perform a SYNC SAVE and exit */
unlink(server.pidfile);
redisLog(REDIS_WARNING,"%zu bytes used at exit",zmalloc_used_memory());
redisLog(REDIS_WARNING,"Server exit now, bye bye...");
+ if (server.vm_enabled) unlink(server.vm_swap_file);
exit(0);
} else {
/* Ooops.. error saving! The best we can do is to continue operating.
lobj = lookupKeyWrite(c->db,c->argv[1]);
if (lobj == NULL) {
if (handleClientsWaitingListPush(c,c->argv[1],c->argv[2])) {
- addReply(c,shared.ok);
+ addReply(c,shared.cone);
return;
}
lobj = createListObject();
return;
}
if (handleClientsWaitingListPush(c,c->argv[1],c->argv[2])) {
- addReply(c,shared.ok);
+ addReply(c,shared.cone);
return;
}
list = lobj->ptr;
incrRefCount(c->argv[2]);
}
server.dirty++;
- addReply(c,shared.ok);
+ addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",listLength(list)));
}
static void lpushCommand(redisClient *c) {
zskiplistNode *zn = zmalloc(sizeof(*zn));
zn->forward = zmalloc(sizeof(zskiplistNode*) * level);
+ if (level > 0)
+ zn->span = zmalloc(sizeof(unsigned int) * (level - 1));
zn->score = score;
zn->obj = obj;
return zn;
zsl->level = 1;
zsl->length = 0;
zsl->header = zslCreateNode(ZSKIPLIST_MAXLEVEL,0,NULL);
- for (j = 0; j < ZSKIPLIST_MAXLEVEL; j++)
+ for (j = 0; j < ZSKIPLIST_MAXLEVEL; j++) {
zsl->header->forward[j] = NULL;
+
+ /* span has space for ZSKIPLIST_MAXLEVEL-1 elements */
+ if (j < ZSKIPLIST_MAXLEVEL-1)
+ zsl->header->span[j] = 0;
+ }
zsl->header->backward = NULL;
zsl->tail = NULL;
return zsl;
static void zslFreeNode(zskiplistNode *node) {
decrRefCount(node->obj);
zfree(node->forward);
+ zfree(node->span);
zfree(node);
}
zskiplistNode *node = zsl->header->forward[0], *next;
zfree(zsl->header->forward);
+ zfree(zsl->header->span);
zfree(zsl->header);
while(node) {
next = node->forward[0];
static void zslInsert(zskiplist *zsl, double score, robj *obj) {
zskiplistNode *update[ZSKIPLIST_MAXLEVEL], *x;
+ unsigned int rank[ZSKIPLIST_MAXLEVEL];
int i, level;
x = zsl->header;
for (i = zsl->level-1; i >= 0; i--) {
+ /* store rank that is crossed to reach the insert position */
+ rank[i] = i == (zsl->level-1) ? 0 : rank[i+1];
+
while (x->forward[i] &&
(x->forward[i]->score < score ||
(x->forward[i]->score == score &&
- compareStringObjects(x->forward[i]->obj,obj) < 0)))
+ compareStringObjects(x->forward[i]->obj,obj) < 0))) {
+ rank[i] += i > 0 ? x->span[i-1] : 1;
x = x->forward[i];
+ }
update[i] = x;
}
/* we assume the key is not already inside, since we allow duplicated
* if the element is already inside or not. */
level = zslRandomLevel();
if (level > zsl->level) {
- for (i = zsl->level; i < level; i++)
+ for (i = zsl->level; i < level; i++) {
+ rank[i] = 0;
update[i] = zsl->header;
+ update[i]->span[i-1] = zsl->length;
+ }
zsl->level = level;
}
x = zslCreateNode(level,score,obj);
for (i = 0; i < level; i++) {
x->forward[i] = update[i]->forward[i];
update[i]->forward[i] = x;
+
+ /* update span covered by update[i] as x is inserted here */
+ if (i > 0) {
+ x->span[i-1] = update[i]->span[i-1] - (rank[0] - rank[i]);
+ update[i]->span[i-1] = (rank[0] - rank[i]) + 1;
+ }
}
+
+ /* increment span for untouched levels */
+ for (i = level; i < zsl->level; i++) {
+ update[i]->span[i-1]++;
+ }
+
x->backward = (update[0] == zsl->header) ? NULL : update[0];
if (x->forward[0])
x->forward[0]->backward = x;
x = x->forward[0];
if (x && score == x->score && compareStringObjects(x->obj,obj) == 0) {
for (i = 0; i < zsl->level; i++) {
- if (update[i]->forward[i] != x) break;
- update[i]->forward[i] = x->forward[i];
+ if (update[i]->forward[i] == x) {
+ if (i > 0) {
+ update[i]->span[i-1] += x->span[i-1] - 1;
+ }
+ update[i]->forward[i] = x->forward[i];
+ } else {
+ /* invariant: i > 0, because update[0]->forward[0]
+ * is always equal to x */
+ update[i]->span[i-1] -= 1;
+ }
}
if (x->forward[0]) {
- x->forward[0]->backward = (x->backward == zsl->header) ?
- NULL : x->backward;
+ x->forward[0]->backward = x->backward;
} else {
zsl->tail = x->backward;
}
zskiplistNode *next;
for (i = 0; i < zsl->level; i++) {
- if (update[i]->forward[i] != x) break;
- update[i]->forward[i] = x->forward[i];
+ if (update[i]->forward[i] == x) {
+ if (i > 0) {
+ update[i]->span[i-1] += x->span[i-1] - 1;
+ }
+ update[i]->forward[i] = x->forward[i];
+ } else {
+ /* invariant: i > 0, because update[0]->forward[0]
+ * is always equal to x */
+ update[i]->span[i-1] -= 1;
+ }
}
if (x->forward[0]) {
- x->forward[0]->backward = (x->backward == zsl->header) ?
- NULL : x->backward;
+ x->forward[0]->backward = x->backward;
} else {
zsl->tail = x->backward;
}
return x->forward[0];
}
+/* Find the rank for an element by both score and key.
+ * Returns 0 when the element cannot be found, rank otherwise.
+ * Note that the rank is 1-based due to the span of zsl->header to the
+ * first element. */
+static unsigned long zslGetRank(zskiplist *zsl, double score, robj *o) {
+ zskiplistNode *x;
+ unsigned long rank = 0;
+ int i;
+
+ x = zsl->header;
+ for (i = zsl->level-1; i >= 0; i--) {
+ while (x->forward[i] &&
+ (x->forward[i]->score < score ||
+ (x->forward[i]->score == score &&
+ compareStringObjects(x->forward[i]->obj,o) <= 0))) {
+ rank += i > 0 ? x->span[i-1] : 1;
+ x = x->forward[i];
+ }
+
+ /* x might be equal to zsl->header, so test if obj is non-NULL */
+ if (x->obj && compareStringObjects(x->obj,o) == 0) {
+ return rank;
+ }
+ }
+ return 0;
+}
+
+/* Finds an element by its rank. The rank argument needs to be 1-based. */
+zskiplistNode* zslGetElementByRank(zskiplist *zsl, unsigned long rank) {
+ zskiplistNode *x;
+ unsigned long traversed = 0;
+ int i;
+
+ x = zsl->header;
+ for (i = zsl->level-1; i >= 0; i--) {
+ while (x->forward[i] && (traversed + (i > 0 ? x->span[i-1] : 1)) <= rank) {
+ traversed += i > 0 ? x->span[i-1] : 1;
+ x = x->forward[i];
+ }
+
+ if (traversed == rank) {
+ return x;
+ }
+ }
+ return NULL;
+}
+
/* The actual Z-commands implementations */
/* This generic command implements both ZADD and ZINCRBY.
if (end >= llen) end = llen-1;
rangelen = (end-start)+1;
- /* Return the result in form of a multi-bulk reply */
+ /* check if starting point is trivial, before searching
+ * the element in log(N) time */
if (reverse) {
- ln = zsl->tail;
- while (start--)
- ln = ln->backward;
+ ln = start == 0 ? zsl->tail : zslGetElementByRank(zsl, llen - start);
} else {
- ln = zsl->header->forward[0];
- while (start--)
- ln = ln->forward[0];
+ ln = start == 0 ? zsl->header->forward[0] : zslGetElementByRank(zsl, start + 1);
}
+ /* Return the result in form of a multi-bulk reply */
addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",
withscores ? (rangelen*2) : rangelen));
for (j = 0; j < rangelen; j++) {
zrangeGenericCommand(c,1);
}
-static void zrangebyscoreCommand(redisClient *c) {
+/* This command implements both ZRANGEBYSCORE and ZCOUNT.
+ * If justcount is non-zero, just the count is returned. */
+static void genericZrangebyscoreCommand(redisClient *c, int justcount) {
robj *o;
- double min = strtod(c->argv[2]->ptr,NULL);
- double max = strtod(c->argv[3]->ptr,NULL);
+ double min, max;
+ int minex = 0, maxex = 0; /* are min or max exclusive? */
int offset = 0, limit = -1;
+ int withscores = 0;
+ int badsyntax = 0;
+
+ /* Parse the min-max interval. If one of the values is prefixed
+ * by the "(" character, it's considered "open". For instance
+ * ZRANGEBYSCORE zset (1.5 (2.5 will match min < x < max
+ * ZRANGEBYSCORE zset 1.5 2.5 will instead match min <= x <= max */
+ if (((char*)c->argv[2]->ptr)[0] == '(') {
+ min = strtod((char*)c->argv[2]->ptr+1,NULL);
+ minex = 1;
+ } else {
+ min = strtod(c->argv[2]->ptr,NULL);
+ }
+ if (((char*)c->argv[3]->ptr)[0] == '(') {
+ max = strtod((char*)c->argv[3]->ptr+1,NULL);
+ maxex = 1;
+ } else {
+ max = strtod(c->argv[3]->ptr,NULL);
+ }
- if (c->argc != 4 && c->argc != 7) {
+ /* Parse "WITHSCORES": note that if the command was called with
+ * the name ZCOUNT then we are sure that c->argc == 4, so we'll never
+ * enter the following paths to parse WITHSCORES and LIMIT. */
+ if (c->argc == 5 || c->argc == 8) {
+ if (strcasecmp(c->argv[c->argc-1]->ptr,"withscores") == 0)
+ withscores = 1;
+ else
+ badsyntax = 1;
+ }
+ if (c->argc != (4 + withscores) && c->argc != (7 + withscores))
+ badsyntax = 1;
+ if (badsyntax) {
addReplySds(c,
sdsnew("-ERR wrong number of arguments for ZRANGEBYSCORE\r\n"));
return;
- } else if (c->argc == 7 && strcasecmp(c->argv[4]->ptr,"limit")) {
+ }
+
+ /* Parse "LIMIT" */
+ if (c->argc == (7 + withscores) && strcasecmp(c->argv[4]->ptr,"limit")) {
addReply(c,shared.syntaxerr);
return;
- } else if (c->argc == 7) {
+ } else if (c->argc == (7 + withscores)) {
offset = atoi(c->argv[5]->ptr);
limit = atoi(c->argv[6]->ptr);
if (offset < 0) offset = 0;
}
+ /* Ok, lookup the key and get the range */
o = lookupKeyRead(c->db,c->argv[1]);
if (o == NULL) {
- addReply(c,shared.nullmultibulk);
+ addReply(c,justcount ? shared.czero : shared.nullmultibulk);
} else {
if (o->type != REDIS_ZSET) {
addReply(c,shared.wrongtypeerr);
zset *zsetobj = o->ptr;
zskiplist *zsl = zsetobj->zsl;
zskiplistNode *ln;
- robj *ele, *lenobj;
- unsigned int rangelen = 0;
+ robj *ele, *lenobj = NULL;
+ unsigned long rangelen = 0;
- /* Get the first node with the score >= min */
+ /* Get the first node with the score >= min, or with
+ * score > min if 'minex' is true. */
ln = zslFirstWithScore(zsl,min);
+ while (minex && ln && ln->score == min) ln = ln->forward[0];
+
if (ln == NULL) {
/* No element matching the speciifed interval */
- addReply(c,shared.emptymultibulk);
+ addReply(c,justcount ? shared.czero : shared.emptymultibulk);
return;
}
* are in the list, so we push this object that will represent
* the multi-bulk length in the output buffer, and will "fix"
* it later */
- lenobj = createObject(REDIS_STRING,NULL);
- addReply(c,lenobj);
- decrRefCount(lenobj);
+ if (!justcount) {
+ lenobj = createObject(REDIS_STRING,NULL);
+ addReply(c,lenobj);
+ decrRefCount(lenobj);
+ }
- while(ln && ln->score <= max) {
+ while(ln && (maxex ? (ln->score < max) : (ln->score <= max))) {
if (offset) {
offset--;
ln = ln->forward[0];
continue;
}
if (limit == 0) break;
- ele = ln->obj;
- addReplyBulkLen(c,ele);
- addReply(c,ele);
- addReply(c,shared.crlf);
+ if (!justcount) {
+ ele = ln->obj;
+ addReplyBulkLen(c,ele);
+ addReply(c,ele);
+ addReply(c,shared.crlf);
+ if (withscores)
+ addReplyDouble(c,ln->score);
+ }
ln = ln->forward[0];
rangelen++;
if (limit > 0) limit--;
}
- lenobj->ptr = sdscatprintf(sdsempty(),"*%d\r\n",rangelen);
+ if (justcount) {
+ addReplyLong(c,(long)rangelen);
+ } else {
+ lenobj->ptr = sdscatprintf(sdsempty(),"*%lu\r\n",
+ withscores ? (rangelen*2) : rangelen);
+ }
}
}
}
+static void zrangebyscoreCommand(redisClient *c) {
+ genericZrangebyscoreCommand(c,0);
+}
+
+static void zcountCommand(redisClient *c) {
+ genericZrangebyscoreCommand(c,1);
+}
+
static void zcardCommand(redisClient *c) {
robj *o;
zset *zs;
}
}
+static void zrankCommand(redisClient *c) {
+ robj *o;
+ o = lookupKeyRead(c->db,c->argv[1]);
+ if (o == NULL) {
+ addReply(c,shared.nullbulk);
+ return;
+ }
+ if (o->type != REDIS_ZSET) {
+ addReply(c,shared.wrongtypeerr);
+ } else {
+ zset *zs = o->ptr;
+ zskiplist *zsl = zs->zsl;
+ dictEntry *de;
+ unsigned long rank;
+
+ de = dictFind(zs->dict,c->argv[2]);
+ if (!de) {
+ addReply(c,shared.nullbulk);
+ return;
+ }
+
+ double *score = dictGetEntryVal(de);
+ rank = zslGetRank(zsl, *score, c->argv[2]);
+ if (rank) {
+ addReplyLong(c, rank-1);
+ } else {
+ addReply(c,shared.nullbulk);
+ }
+ }
+}
+
+/* ==================================== Hash ================================ */
+static void hsetCommand(redisClient *c) {
+ int update = 0;
+ robj *o = lookupKeyWrite(c->db,c->argv[1]);
+
+ if (o == NULL) {
+ o = createHashObject();
+ dictAdd(c->db->dict,c->argv[1],o);
+ incrRefCount(c->argv[1]);
+ } else {
+ if (o->type != REDIS_HASH) {
+ addReply(c,shared.wrongtypeerr);
+ return;
+ }
+ }
+ if (o->encoding == REDIS_ENCODING_ZIPMAP) {
+ unsigned char *zm = o->ptr;
+
+ zm = zipmapSet(zm,c->argv[2]->ptr,sdslen(c->argv[2]->ptr),
+ c->argv[3]->ptr,sdslen(c->argv[3]->ptr),&update);
+ } else {
+ if (dictAdd(o->ptr,c->argv[2],c->argv[3]) == DICT_OK) {
+ incrRefCount(c->argv[2]);
+ } else {
+ update = 1;
+ }
+ incrRefCount(c->argv[3]);
+ }
+ server.dirty++;
+ addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",update == 0));
+}
+
+static void hgetCommand(redisClient *c) {
+ robj *o = lookupKeyRead(c->db,c->argv[1]);
+
+ if (o == NULL) {
+ addReply(c,shared.nullbulk);
+ return;
+ } else {
+ if (o->encoding == REDIS_ENCODING_ZIPMAP) {
+ unsigned char *zm = o->ptr;
+ unsigned char *val;
+ unsigned int vlen;
+
+ if (zipmapGet(zm,c->argv[2]->ptr,sdslen(c->argv[2]->ptr), &val,&vlen)) {
+ addReplySds(c,sdscatprintf(sdsempty(),"$%u\r\n", vlen));
+ addReplySds(c,sdsnewlen(val,vlen));
+ addReply(c,shared.crlf);
+ return;
+ } else {
+ addReply(c,shared.nullbulk);
+ return;
+ }
+ } else {
+ struct dictEntry *de;
+
+ de = dictFind(o->ptr,c->argv[2]);
+ if (de == NULL) {
+ addReply(c,shared.nullbulk);
+ } else {
+ robj *e = dictGetEntryVal(de);
+
+ addReplyBulkLen(c,e);
+ addReply(c,e);
+ addReply(c,shared.crlf);
+ }
+ }
+ }
+}
+
/* ========================= Non type-specific commands ==================== */
static void flushdbCommand(redisClient *c) {
if (sortval->type == REDIS_LIST) {
list *list = sortval->ptr;
listNode *ln;
+ listIter li;
- listRewind(list);
- while((ln = listYield(list))) {
+ listRewind(list,&li);
+ while((ln = listNext(&li))) {
robj *ele = ln->value;
vector[j].obj = ele;
vector[j].u.score = 0;
addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",outputlen));
for (j = start; j <= end; j++) {
listNode *ln;
+ listIter li;
+
if (!getop) {
addReplyBulkLen(c,vector[j].obj);
addReply(c,vector[j].obj);
addReply(c,shared.crlf);
}
- listRewind(operations);
- while((ln = listYield(operations))) {
+ listRewind(operations,&li);
+ while((ln = listNext(&li))) {
redisSortOperation *sop = ln->value;
robj *val = lookupKeyByPattern(c->db,sop->pattern,
vector[j].obj);
/* STORE option specified, set the sorting result as a List object */
for (j = start; j <= end; j++) {
listNode *ln;
+ listIter li;
+
if (!getop) {
listAddNodeTail(listPtr,vector[j].obj);
incrRefCount(vector[j].obj);
}
- listRewind(operations);
- while((ln = listYield(operations))) {
+ listRewind(operations,&li);
+ while((ln = listNext(&li))) {
redisSortOperation *sop = ln->value;
robj *val = lookupKeyByPattern(c->db,sop->pattern,
vector[j].obj);
sprintf(s,"%.2fM",d);
} else if (n < (1024LL*1024*1024*1024)) {
d = (double)n/(1024LL*1024*1024);
- sprintf(s,"%.2fM",d);
+ sprintf(s,"%.2fG",d);
}
}
int j;
char hmem[64];
- bytesToHuman(hmem,server.usedmemory);
+ bytesToHuman(hmem,zmalloc_used_memory());
info = sdscatprintf(sdsempty(),
"redis_version:%s\r\n"
"arch_bits:%s\r\n"
uptime/(3600*24),
listLength(server.clients)-listLength(server.slaves),
listLength(server.slaves),
- server.blockedclients,
- server.usedmemory,
+ server.blpop_blocked_clients,
+ zmalloc_used_memory(),
hmem,
server.dirty,
server.bgsavechildpid != -1,
);
}
if (server.vm_enabled) {
+ lockThreadedIO();
info = sdscatprintf(info,
"vm_conf_max_memory:%llu\r\n"
"vm_conf_page_size:%llu\r\n"
"vm_stats_io_newjobs_len:%lu\r\n"
"vm_stats_io_processing_len:%lu\r\n"
"vm_stats_io_processed_len:%lu\r\n"
- "vm_stats_io_waiting_clients:%lu\r\n"
+ "vm_stats_io_active_threads:%lu\r\n"
+ "vm_stats_blocked_clients:%lu\r\n"
,(unsigned long long) server.vm_max_memory,
(unsigned long long) server.vm_page_size,
(unsigned long long) server.vm_pages,
(unsigned long) listLength(server.io_newjobs),
(unsigned long) listLength(server.io_processing),
(unsigned long) listLength(server.io_processed),
- (unsigned long) listLength(server.io_clients)
+ (unsigned long) server.io_active_threads,
+ (unsigned long) server.vm_blocked_clients
);
+ unlockThreadedIO();
}
for (j = 0; j < server.dbnum; j++) {
long long keys, vkeys;
addReply(c,shared.ok);
}
+static void discardCommand(redisClient *c) {
+ if (!(c->flags & REDIS_MULTI)) {
+ addReplySds(c,sdsnew("-ERR DISCARD without MULTI\r\n"));
+ return;
+ }
+
+ freeClientMultiState(c);
+ initClientMultiState(c);
+ c->flags &= (~REDIS_MULTI);
+ addReply(c,shared.ok);
+}
+
static void execCommand(redisClient *c) {
int j;
robj **orig_argv;
}
/* Mark the client as a blocked client */
c->flags |= REDIS_BLOCKED;
- aeDeleteFileEvent(server.el,c->fd,AE_READABLE);
- server.blockedclients++;
+ server.blpop_blocked_clients++;
}
/* Unblock a client that's waiting in a blocking operation such as BLPOP */
-static void unblockClient(redisClient *c) {
+static void unblockClientWaitingData(redisClient *c) {
dictEntry *de;
list *l;
int j;
zfree(c->blockingkeys);
c->blockingkeys = NULL;
c->flags &= (~REDIS_BLOCKED);
- server.blockedclients--;
- /* Ok now we are ready to get read events from socket, note that we
- * can't trap errors here as it's possible that unblockClients() is
- * called from freeClient() itself, and the only thing we can do
- * if we failed to register the READABLE event is to kill the client.
- * Still the following function should never fail in the real world as
- * we are sure the file descriptor is sane, and we exit on out of mem. */
- aeCreateFileEvent(server.el, c->fd, AE_READABLE, readQueryFromClient, c);
- /* As a final step we want to process data if there is some command waiting
- * in the input buffer. Note that this is safe even if unblockClient()
- * gets called from freeClient() because freeClient() will be smart
- * enough to call this function *after* c->querybuf was set to NULL. */
+ server.blpop_blocked_clients--;
+ /* We want to process data if there is some command waiting
+ * in the input buffer. Note that this is safe even if
+ * unblockClientWaitingData() gets called from freeClient() because
+ * freeClient() will be smart enough to call this function
+ * *after* c->querybuf was set to NULL. */
if (c->querybuf && sdslen(c->querybuf) > 0) processInputBuffer(c);
}
addReplyBulkLen(receiver,ele);
addReply(receiver,ele);
addReply(receiver,shared.crlf);
- unblockClient(receiver);
+ unblockClientWaitingData(receiver);
return 1;
}
* registering differences since the server forked to save */
redisClient *slave;
listNode *ln;
+ listIter li;
- listRewind(server.slaves);
- while((ln = listYield(server.slaves))) {
+ listRewind(server.slaves,&li);
+ while((ln = listNext(&li))) {
slave = ln->value;
if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_END) break;
}
static void updateSlavesWaitingBgsave(int bgsaveerr) {
listNode *ln;
int startbgsave = 0;
+ listIter li;
- listRewind(server.slaves);
- while((ln = listYield(server.slaves))) {
+ listRewind(server.slaves,&li);
+ while((ln = listNext(&li))) {
redisClient *slave = ln->value;
if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_START) {
}
if (startbgsave) {
if (rdbSaveBackground(server.dbfilename) != REDIS_OK) {
- listRewind(server.slaves);
+ listIter li;
+
+ listRewind(server.slaves,&li);
redisLog(REDIS_WARNING,"SYNC failed. BGSAVE failed");
- while((ln = listYield(server.slaves))) {
+ while((ln = listNext(&li))) {
redisClient *slave = ln->value;
if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_START)
/* ============================ Maxmemory directive ======================== */
-/* Free one object form the pre-allocated objects free list. This is useful
- * under low mem conditions as by default we take 1 million free objects
- * allocated. */
-static void freeOneObjectFromFreelist(void) {
+/* Try to free one object form the pre-allocated objects free list.
+ * This is useful under low mem conditions as by default we take 1 million
+ * free objects allocated. On success REDIS_OK is returned, otherwise
+ * REDIS_ERR. */
+static int tryFreeOneObjectFromFreelist(void) {
robj *o;
- listNode *head = listFirst(server.objfreelist);
- o = listNodeValue(head);
- listDelNode(server.objfreelist,head);
- zfree(o);
+ if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
+ if (listLength(server.objfreelist)) {
+ listNode *head = listFirst(server.objfreelist);
+ o = listNodeValue(head);
+ listDelNode(server.objfreelist,head);
+ if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
+ zfree(o);
+ return REDIS_OK;
+ } else {
+ if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
+ return REDIS_ERR;
+ }
}
/* This function gets called when 'maxmemory' is set on the config file to limit
*/
static void freeMemoryIfNeeded(void) {
while (server.maxmemory && zmalloc_used_memory() > server.maxmemory) {
- if (listLength(server.objfreelist)) {
- freeOneObjectFromFreelist();
- } else {
- int j, k, freed = 0;
-
- for (j = 0; j < server.dbnum; j++) {
- int minttl = -1;
- robj *minkey = NULL;
- struct dictEntry *de;
-
- if (dictSize(server.db[j].expires)) {
- freed = 1;
- /* From a sample of three keys drop the one nearest to
- * the natural expire */
- for (k = 0; k < 3; k++) {
- time_t t;
-
- de = dictGetRandomKey(server.db[j].expires);
- t = (time_t) dictGetEntryVal(de);
- if (minttl == -1 || t < minttl) {
- minkey = dictGetEntryKey(de);
- minttl = t;
- }
+ int j, k, freed = 0;
+
+ if (tryFreeOneObjectFromFreelist() == REDIS_OK) continue;
+ for (j = 0; j < server.dbnum; j++) {
+ int minttl = -1;
+ robj *minkey = NULL;
+ struct dictEntry *de;
+
+ if (dictSize(server.db[j].expires)) {
+ freed = 1;
+ /* From a sample of three keys drop the one nearest to
+ * the natural expire */
+ for (k = 0; k < 3; k++) {
+ time_t t;
+
+ de = dictGetRandomKey(server.db[j].expires);
+ t = (time_t) dictGetEntryVal(de);
+ if (minttl == -1 || t < minttl) {
+ minkey = dictGetEntryKey(de);
+ minttl = t;
}
- deleteKey(server.db+j,minkey);
}
+ deleteKey(server.db+j,minkey);
}
- if (!freed) return; /* nothing to free... */
}
+ if (!freed) return; /* nothing to free... */
}
}
char buf[128];
int decrrc = 0;
- if (obj->storage == REDIS_VM_MEMORY && obj->encoding != REDIS_ENCODING_RAW){
+ /* Avoid the incr/decr ref count business if possible to help
+ * copy-on-write (we are often in a child process when this function
+ * is called).
+ * Also makes sure that key objects don't get incrRefCount-ed when VM
+ * is enabled */
+ if (obj->encoding != REDIS_ENCODING_RAW) {
obj = getDecodedObject(obj);
decrrc = 1;
}
/* Emit the RPUSHes needed to rebuild the list */
list *list = o->ptr;
listNode *ln;
+ listIter li;
- listRewind(list);
- while((ln = listYield(list))) {
+ listRewind(list,&li);
+ while((ln = listNext(&li))) {
char cmd[]="*3\r\n$5\r\nRPUSH\r\n";
robj *eleobj = listNodeValue(ln);
pid_t childpid;
if (server.bgrewritechildpid != -1) return REDIS_ERR;
+ if (server.vm_enabled) waitEmptyIOJobsQueue();
if ((childpid = fork()) == 0) {
/* Child */
char tmpfile[256];
- close(server.fd);
+ if (server.vm_enabled) vmReopenSwapFile();
+ close(server.fd);
snprintf(tmpfile,256,"temp-rewriteaof-bg-%d.aof", (int) getpid());
if (rewriteAppendOnlyFile(tmpfile) == REDIS_OK) {
- exit(0);
+ _exit(0);
} else {
- exit(1);
+ _exit(1);
}
} else {
/* Parent */
*/
/* =================== Virtual Memory - Blocking Side ====================== */
+
+/* substitute the first occurrence of '%p' with the process pid in the
+ * swap file name. */
+static void expandVmSwapFilename(void) {
+ char *p = strstr(server.vm_swap_file,"%p");
+ sds new;
+
+ if (!p) return;
+ new = sdsempty();
+ *p = '\0';
+ new = sdscat(new,server.vm_swap_file);
+ new = sdscatprintf(new,"%ld",(long) getpid());
+ new = sdscat(new,p+2);
+ zfree(server.vm_swap_file);
+ server.vm_swap_file = new;
+}
+
static void vmInit(void) {
off_t totsize;
int pipefds[2];
+ size_t stacksize;
- server.vm_fp = fopen("/tmp/redisvm","w+b");
+ if (server.vm_max_threads != 0)
+ zmalloc_enable_thread_safeness(); /* we need thread safe zmalloc() */
+
+ expandVmSwapFilename();
+ redisLog(REDIS_NOTICE,"Using '%s' as swap file",server.vm_swap_file);
+ if ((server.vm_fp = fopen(server.vm_swap_file,"r+b")) == NULL) {
+ server.vm_fp = fopen(server.vm_swap_file,"w+b");
+ }
if (server.vm_fp == NULL) {
- redisLog(REDIS_WARNING,"Impossible to open the swap file. Exiting.");
+ redisLog(REDIS_WARNING,
+ "Impossible to open the swap file: %s. Exiting.",
+ strerror(errno));
exit(1);
}
server.vm_fd = fileno(server.vm_fp);
redisLog(REDIS_VERBOSE,"Allocated %lld bytes page table for %lld pages",
(long long) (server.vm_pages+7)/8, server.vm_pages);
memset(server.vm_bitmap,0,(server.vm_pages+7)/8);
- /* Try to remove the swap file, so the OS will really delete it from the
- * file system when Redis exists. */
- unlink("/tmp/redisvm");
/* Initialize threaded I/O (used by Virtual Memory) */
server.io_newjobs = listCreate();
server.io_processing = listCreate();
server.io_processed = listCreate();
- server.io_clients = listCreate();
+ server.io_ready_clients = listCreate();
pthread_mutex_init(&server.io_mutex,NULL);
+ pthread_mutex_init(&server.obj_freelist_mutex,NULL);
+ pthread_mutex_init(&server.io_swapfile_mutex,NULL);
server.io_active_threads = 0;
if (pipe(pipefds) == -1) {
redisLog(REDIS_WARNING,"Unable to intialized VM: pipe(2): %s. Exiting."
server.io_ready_pipe_read = pipefds[0];
server.io_ready_pipe_write = pipefds[1];
redisAssert(anetNonBlock(NULL,server.io_ready_pipe_read) != ANET_ERR);
+ /* LZF requires a lot of stack */
+ pthread_attr_init(&server.io_threads_attr);
+ pthread_attr_getstacksize(&server.io_threads_attr, &stacksize);
+ while (stacksize < REDIS_THREAD_STACK_SIZE) stacksize *= 2;
+ pthread_attr_setstacksize(&server.io_threads_attr, stacksize);
/* Listen for events in the threaded I/O pipe */
if (aeCreateFileEvent(server.el, server.io_ready_pipe_read, AE_READABLE,
vmThreadedIOCompletedJob, NULL) == AE_ERR)
static void vmMarkPageUsed(off_t page) {
off_t byte = page/8;
int bit = page&7;
+ redisAssert(vmFreePage(page) == 1);
server.vm_bitmap[byte] |= 1<<bit;
- redisLog(REDIS_DEBUG,"Mark used: %lld (byte:%lld bit:%d)\n",
- (long long)page, (long long)byte, bit);
}
/* Mark N contiguous pages as used, with 'page' being the first. */
for (j = 0; j < count; j++)
vmMarkPageUsed(page+j);
server.vm_stats_used_pages += count;
+ redisLog(REDIS_DEBUG,"Mark USED pages: %lld pages at %lld\n",
+ (long long)count, (long long)page);
}
/* Mark the page as free */
static void vmMarkPageFree(off_t page) {
off_t byte = page/8;
int bit = page&7;
+ redisAssert(vmFreePage(page) == 0);
server.vm_bitmap[byte] &= ~(1<<bit);
}
for (j = 0; j < count; j++)
vmMarkPageFree(page+j);
server.vm_stats_used_pages -= count;
+ redisLog(REDIS_DEBUG,"Mark FREE pages: %lld pages at %lld\n",
+ (long long)count, (long long)page);
}
/* Test if the page is free */
* note: I implemented this function just after watching an episode of
* Battlestar Galactica, where the hybrid was continuing to say "JUMP!"
*/
-static int vmFindContiguousPages(off_t *first, int n) {
+static int vmFindContiguousPages(off_t *first, off_t n) {
off_t base, offset = 0, since_jump = 0, numfree = 0;
if (server.vm_near_pages == REDIS_VM_MAX_NEAR_PAGES) {
while(offset < server.vm_pages) {
off_t this = base+offset;
- redisLog(REDIS_DEBUG, "THIS: %lld (%c)\n", (long long) this, vmFreePage(this) ? 'F' : 'X');
/* If we overflow, restart from page zero */
if (this >= server.vm_pages) {
this -= server.vm_pages;
if (numfree == n) {
*first = this-(n-1);
server.vm_next_page = this+1;
+ redisLog(REDIS_DEBUG, "FOUND CONTIGUOUS PAGES: %lld pages at %lld\n", (long long) n, (long long) *first);
return REDIS_OK;
}
} else {
return REDIS_ERR;
}
+/* Write the specified object at the specified page of the swap file */
+static int vmWriteObjectOnSwap(robj *o, off_t page) {
+ if (server.vm_enabled) pthread_mutex_lock(&server.io_swapfile_mutex);
+ if (fseeko(server.vm_fp,page*server.vm_page_size,SEEK_SET) == -1) {
+ if (server.vm_enabled) pthread_mutex_unlock(&server.io_swapfile_mutex);
+ redisLog(REDIS_WARNING,
+ "Critical VM problem in vmWriteObjectOnSwap(): can't seek: %s",
+ strerror(errno));
+ return REDIS_ERR;
+ }
+ rdbSaveObject(server.vm_fp,o);
+ fflush(server.vm_fp);
+ if (server.vm_enabled) pthread_mutex_unlock(&server.io_swapfile_mutex);
+ return REDIS_OK;
+}
+
/* Swap the 'val' object relative to 'key' into disk. Store all the information
* needed to later retrieve the object into the key object.
* If we can't find enough contiguous empty pages to swap the object on disk
assert(key->storage == REDIS_VM_MEMORY);
assert(key->refcount == 1);
if (vmFindContiguousPages(&page,pages) == REDIS_ERR) return REDIS_ERR;
- if (fseeko(server.vm_fp,page*server.vm_page_size,SEEK_SET) == -1) {
- redisLog(REDIS_WARNING,
- "Critical VM problem in vmSwapObjectBlocking(): can't seek: %s",
- strerror(errno));
- return REDIS_ERR;
- }
- rdbSaveObject(server.vm_fp,val);
+ if (vmWriteObjectOnSwap(val,page) == REDIS_ERR) return REDIS_ERR;
key->vm.page = page;
key->vm.usedpages = pages;
key->storage = REDIS_VM_SWAPPED;
(unsigned long long) page, (unsigned long long) pages);
server.vm_stats_swapped_objects++;
server.vm_stats_swapouts++;
- fflush(server.vm_fp);
return REDIS_OK;
}
+static robj *vmReadObjectFromSwap(off_t page, int type) {
+ robj *o;
+
+ if (server.vm_enabled) pthread_mutex_lock(&server.io_swapfile_mutex);
+ if (fseeko(server.vm_fp,page*server.vm_page_size,SEEK_SET) == -1) {
+ redisLog(REDIS_WARNING,
+ "Unrecoverable VM problem in vmReadObjectFromSwap(): can't seek: %s",
+ strerror(errno));
+ _exit(1);
+ }
+ o = rdbLoadObject(type,server.vm_fp);
+ if (o == NULL) {
+ redisLog(REDIS_WARNING, "Unrecoverable VM problem in vmReadObjectFromSwap(): can't load object from swap file: %s", strerror(errno));
+ _exit(1);
+ }
+ if (server.vm_enabled) pthread_mutex_unlock(&server.io_swapfile_mutex);
+ return o;
+}
+
/* Load the value object relative to the 'key' object from swap to memory.
* The newly allocated object is returned.
*
static robj *vmGenericLoadObject(robj *key, int preview) {
robj *val;
- redisAssert(key->storage == REDIS_VM_SWAPPED);
- if (fseeko(server.vm_fp,key->vm.page*server.vm_page_size,SEEK_SET) == -1) {
- redisLog(REDIS_WARNING,
- "Unrecoverable VM problem in vmLoadObject(): can't seek: %s",
- strerror(errno));
- exit(1);
- }
- val = rdbLoadObject(key->vtype,server.vm_fp);
- if (val == NULL) {
- redisLog(REDIS_WARNING, "Unrecoverable VM problem in vmLoadObject(): can't load object from swap file: %s", strerror(errno));
- exit(1);
- }
+ redisAssert(key->storage == REDIS_VM_SWAPPED || key->storage == REDIS_VM_LOADING);
+ val = vmReadObjectFromSwap(key->vm.page,key->vtype);
if (!preview) {
key->storage = REDIS_VM_MEMORY;
key->vm.atime = server.unixtime;
}
break;
}
- return (double)asize*log(1+asize);
+ return (double)age*log(1+asize);
}
/* Try to swap an object that's a good candidate for swapping.
for (j = 0; j < server.dbnum; j++) {
redisDb *db = server.db+j;
- int maxtries = 1000;
+ /* Why maxtries is set to 100?
+ * Because this way (usually) we'll find 1 object even if just 1% - 2%
+ * are swappable objects */
+ int maxtries = 100;
if (dictSize(db->dict) == 0) continue;
for (i = 0; i < 5; i++) {
de = dictGetRandomKey(db->dict);
key = dictGetEntryKey(de);
val = dictGetEntryVal(de);
- if (key->storage != REDIS_VM_MEMORY) {
+ /* Only swap objects that are currently in memory.
+ *
+ * Also don't swap shared objects if threaded VM is on, as we
+ * try to ensure that the main thread does not touch the
+ * object while the I/O thread is using it, but we can't
+ * control other keys without adding additional mutex. */
+ if (key->storage != REDIS_VM_MEMORY ||
+ (server.vm_max_threads != 0 && val->refcount != 1)) {
if (maxtries) i--; /* don't count this try */
continue;
}
}
}
}
- if (best == NULL) {
- redisLog(REDIS_DEBUG,"No swappable key found!");
- return REDIS_ERR;
- }
+ if (best == NULL) return REDIS_ERR;
key = dictGetEntryKey(best);
val = dictGetEntryVal(best);
/* =================== Virtual Memory - Threaded I/O ======================= */
static void freeIOJob(iojob *j) {
- if (j->type == REDIS_IOJOB_PREPARE_SWAP ||
- j->type == REDIS_IOJOB_DO_SWAP)
+ if ((j->type == REDIS_IOJOB_PREPARE_SWAP ||
+ j->type == REDIS_IOJOB_DO_SWAP ||
+ j->type == REDIS_IOJOB_LOAD) && j->val != NULL)
decrRefCount(j->val);
decrRefCount(j->key);
zfree(j);
int mask)
{
char buf[1];
- int retval;
+ int retval, processed = 0, toprocess = -1, trytoswap = 1;
REDIS_NOTUSED(el);
REDIS_NOTUSED(mask);
REDIS_NOTUSED(privdata);
struct dictEntry *de;
redisLog(REDIS_DEBUG,"Processing I/O completed job");
- assert(listLength(server.io_processed) != 0);
/* Get the processed element (the oldest one) */
lockThreadedIO();
+ assert(listLength(server.io_processed) != 0);
+ if (toprocess == -1) {
+ toprocess = (listLength(server.io_processed)*REDIS_MAX_COMPLETED_JOBS_PROCESSED)/100;
+ if (toprocess <= 0) toprocess = 1;
+ }
ln = listFirst(server.io_processed);
j = ln->value;
listDelNode(server.io_processed,ln);
}
/* Post process it in the main thread, as there are things we
* can do just here to avoid race conditions and/or invasive locks */
- redisLog(REDIS_DEBUG,"Job type: %d, key at %p (%s) refcount: %d\n", j->type, (void*)j->key, (char*)j->key->ptr, j->key->refcount);
+ redisLog(REDIS_DEBUG,"Job %p type: %d, key at %p (%s) refcount: %d\n", (void*) j, j->type, (void*)j->key, (char*)j->key->ptr, j->key->refcount);
de = dictFind(j->db->dict,j->key);
assert(de != NULL);
key = dictGetEntryKey(de);
if (j->type == REDIS_IOJOB_LOAD) {
+ redisDb *db;
+
/* Key loaded, bring it at home */
key->storage = REDIS_VM_MEMORY;
key->vm.atime = server.unixtime;
(unsigned char*) key->ptr);
server.vm_stats_swapped_objects--;
server.vm_stats_swapins++;
+ dictGetEntryVal(de) = j->val;
+ incrRefCount(j->val);
+ db = j->db;
freeIOJob(j);
+ /* Handle clients waiting for this key to be loaded. */
+ handleClientsBlockedOnSwappedKey(db,key);
} else if (j->type == REDIS_IOJOB_PREPARE_SWAP) {
/* Now we know the amount of pages required to swap this object.
* Let's find some space for it, and queue this task again
* rebranded as REDIS_IOJOB_DO_SWAP. */
- if (vmFindContiguousPages(&j->page,j->pages) == REDIS_ERR) {
- /* Ooops... no space! */
+ if (!vmCanSwapOut() ||
+ vmFindContiguousPages(&j->page,j->pages) == REDIS_ERR)
+ {
+ /* Ooops... no space or we can't swap as there is
+ * a fork()ed Redis trying to save stuff on disk. */
freeIOJob(j);
+ key->storage = REDIS_VM_MEMORY; /* undo operation */
} else {
+ /* Note that we need to mark this pages as used now,
+ * if the job will be canceled, we'll mark them as freed
+ * again. */
+ vmMarkPagesUsed(j->page,j->pages);
j->type = REDIS_IOJOB_DO_SWAP;
lockThreadedIO();
queueIOJob(j);
robj *val;
/* Key swapped. We can finally free some memory. */
+ if (key->storage != REDIS_VM_SWAPPING) {
+ printf("key->storage: %d\n",key->storage);
+ printf("key->name: %s\n",(char*)key->ptr);
+ printf("key->refcount: %d\n",key->refcount);
+ printf("val: %p\n",(void*)j->val);
+ printf("val->type: %d\n",j->val->type);
+ printf("val->ptr: %s\n",(char*)j->val->ptr);
+ }
+ redisAssert(key->storage == REDIS_VM_SWAPPING);
val = dictGetEntryVal(de);
key->vm.page = j->page;
key->vm.usedpages = j->pages;
key->vtype = j->val->type;
decrRefCount(val); /* Deallocate the object from memory. */
dictGetEntryVal(de) = NULL;
- vmMarkPagesUsed(j->page,j->pages);
redisLog(REDIS_DEBUG,
"VM: object %s swapped out at %lld (%lld pages) (threaded)",
(unsigned char*) key->ptr,
freeIOJob(j);
/* Put a few more swap requests in queue if we are still
* out of memory */
- if (zmalloc_used_memory() > server.vm_max_memory) {
+ if (trytoswap && vmCanSwapOut() &&
+ zmalloc_used_memory() > server.vm_max_memory)
+ {
int more = 1;
while(more) {
lockThreadedIO();
(unsigned) server.vm_max_threads;
unlockThreadedIO();
/* Don't waste CPU time if swappable objects are rare. */
- if (vmSwapOneObjectThreaded() == REDIS_ERR) break;
+ if (vmSwapOneObjectThreaded() == REDIS_ERR) {
+ trytoswap = 0;
+ break;
+ }
}
}
}
+ processed++;
+ if (processed == toprocess) return;
}
if (retval < 0 && errno != EAGAIN) {
redisLog(REDIS_WARNING,
* processed, otherwise make sure to flag it as canceled. */
static void vmCancelThreadedIOJob(robj *o) {
list *lists[3] = {
- server.io_newjobs, server.io_processing, server.io_processed
+ server.io_newjobs, /* 0 */
+ server.io_processing, /* 1 */
+ server.io_processed /* 2 */
};
int i;
assert(o->storage == REDIS_VM_LOADING || o->storage == REDIS_VM_SWAPPING);
+again:
lockThreadedIO();
/* Search for a matching key in one of the queues */
for (i = 0; i < 3; i++) {
listNode *ln;
+ listIter li;
- listRewind(lists[i]);
- while ((ln = listYield(lists[i])) != NULL) {
+ listRewind(lists[i],&li);
+ while ((ln = listNext(&li)) != NULL) {
iojob *job = ln->value;
+ if (job->canceled) continue; /* Skip this, already canceled. */
if (compareStringObjects(job->key,o) == 0) {
+ redisLog(REDIS_DEBUG,"*** CANCELED %p (%s) (type %d) (LIST ID %d)\n",
+ (void*)job, (char*)o->ptr, job->type, i);
+ /* Mark the pages as free since the swap didn't happened
+ * or happened but is now discarded. */
+ if (i != 1 && job->type == REDIS_IOJOB_DO_SWAP)
+ vmMarkPagesFree(job->page,job->pages);
+ /* Cancel the job. It depends on the list the job is
+ * living in. */
switch(i) {
case 0: /* io_newjobs */
- /* If the job was not yet processed the best thing to do
+ /* If the job was yet not processed the best thing to do
* is to remove it from the queue at all */
- decrRefCount(job->key);
- if (job->type == REDIS_IOJOB_PREPARE_SWAP ||
- job->type == REDIS_IOJOB_DO_SWAP)
- decrRefCount(job->val);
+ freeIOJob(job);
listDelNode(lists[i],ln);
- zfree(job);
break;
case 1: /* io_processing */
+ /* Oh Shi- the thread is messing with the Job:
+ *
+ * Probably it's accessing the object if this is a
+ * PREPARE_SWAP or DO_SWAP job.
+ * If it's a LOAD job it may be reading from disk and
+ * if we don't wait for the job to terminate before to
+ * cancel it, maybe in a few microseconds data can be
+ * corrupted in this pages. So the short story is:
+ *
+ * Better to wait for the job to move into the
+ * next queue (processed)... */
+
+ /* We try again and again until the job is completed. */
+ unlockThreadedIO();
+ /* But let's wait some time for the I/O thread
+ * to finish with this job. After all this condition
+ * should be very rare. */
+ usleep(1);
+ goto again;
case 2: /* io_processed */
+ /* The job was already processed, that's easy...
+ * just mark it as canceled so that we'll ignore it
+ * when processing completed jobs. */
job->canceled = 1;
break;
}
+ /* Finally we have to adjust the storage type of the object
+ * in order to "UNDO" the operaiton. */
if (o->storage == REDIS_VM_LOADING)
o->storage = REDIS_VM_SWAPPED;
else if (o->storage == REDIS_VM_SWAPPING)
lockThreadedIO();
if (listLength(server.io_newjobs) == 0) {
/* No new jobs in queue, exit. */
- redisLog(REDIS_DEBUG,"Thread %lld exiting, nothing to do\n",
- (long long) pthread_self());
+ redisLog(REDIS_DEBUG,"Thread %ld exiting, nothing to do",
+ (long) pthread_self());
server.io_active_threads--;
unlockThreadedIO();
return NULL;
listAddNodeTail(server.io_processing,j);
ln = listLast(server.io_processing); /* We use ln later to remove it */
unlockThreadedIO();
- redisLog(REDIS_DEBUG,"Thread %lld got a new job: %p about key '%s'\n",
- (long long) pthread_self(), (void*)j, (char*)j->key->ptr);
+ redisLog(REDIS_DEBUG,"Thread %ld got a new job (type %d): %p about key '%s'",
+ (long) pthread_self(), j->type, (void*)j, (char*)j->key->ptr);
/* Process the Job */
if (j->type == REDIS_IOJOB_LOAD) {
+ j->val = vmReadObjectFromSwap(j->page,j->key->vtype);
} else if (j->type == REDIS_IOJOB_PREPARE_SWAP) {
FILE *fp = fopen("/dev/null","w+");
j->pages = rdbSavedObjectPages(j->val,fp);
fclose(fp);
} else if (j->type == REDIS_IOJOB_DO_SWAP) {
+ if (vmWriteObjectOnSwap(j->val,j->page) == REDIS_ERR)
+ j->canceled = 1;
}
/* Done: insert the job into the processed queue */
- redisLog(REDIS_DEBUG,"Thread %lld completed the job: %p\n",
- (long long) pthread_self(), (void*)j);
+ redisLog(REDIS_DEBUG,"Thread %ld completed the job: %p (key %s)",
+ (long) pthread_self(), (void*)j, (char*)j->key->ptr);
lockThreadedIO();
listDelNode(server.io_processing,ln);
listAddNodeTail(server.io_processed,j);
static void spawnIOThread(void) {
pthread_t thread;
-
- pthread_create(&thread,NULL,IOThreadEntryPoint,NULL);
+ sigset_t mask, omask;
+
+ sigemptyset(&mask);
+ sigaddset(&mask,SIGCHLD);
+ sigaddset(&mask,SIGHUP);
+ sigaddset(&mask,SIGPIPE);
+ pthread_sigmask(SIG_SETMASK, &mask, &omask);
+ pthread_create(&thread,&server.io_threads_attr,IOThreadEntryPoint,NULL);
+ pthread_sigmask(SIG_SETMASK, &omask, NULL);
server.io_active_threads++;
}
+/* We need to wait for the last thread to exit before we are able to
+ * fork() in order to BGSAVE or BGREWRITEAOF. */
+static void waitEmptyIOJobsQueue(void) {
+ while(1) {
+ int io_processed_len;
+
+ lockThreadedIO();
+ if (listLength(server.io_newjobs) == 0 &&
+ listLength(server.io_processing) == 0 &&
+ server.io_active_threads == 0)
+ {
+ unlockThreadedIO();
+ return;
+ }
+ /* While waiting for empty jobs queue condition we post-process some
+ * finshed job, as I/O threads may be hanging trying to write against
+ * the io_ready_pipe_write FD but there are so much pending jobs that
+ * it's blocking. */
+ io_processed_len = listLength(server.io_processed);
+ unlockThreadedIO();
+ if (io_processed_len) {
+ vmThreadedIOCompletedJob(NULL,server.io_ready_pipe_read,NULL,0);
+ usleep(1000); /* 1 millisecond */
+ } else {
+ usleep(10000); /* 10 milliseconds */
+ }
+ }
+}
+
+static void vmReopenSwapFile(void) {
+ /* Note: we don't close the old one as we are in the child process
+ * and don't want to mess at all with the original file object. */
+ server.vm_fp = fopen(server.vm_swap_file,"r+b");
+ if (server.vm_fp == NULL) {
+ redisLog(REDIS_WARNING,"Can't re-open the VM swap file: %s. Exiting.",
+ server.vm_swap_file);
+ _exit(1);
+ }
+ server.vm_fd = fileno(server.vm_fp);
+}
+
/* This function must be called while with threaded IO locked */
static void queueIOJob(iojob *j) {
+ redisLog(REDIS_DEBUG,"Queued IO Job %p type %d about key '%s'\n",
+ (void*)j, j->type, (char*)j->key->ptr);
listAddNodeTail(server.io_newjobs,j);
if (server.io_active_threads < server.vm_max_threads)
spawnIOThread();
return REDIS_OK;
}
+/* ============ Virtual Memory - Blocking clients on missing keys =========== */
+
+/* This function makes the clinet 'c' waiting for the key 'key' to be loaded.
+ * If there is not already a job loading the key, it is craeted.
+ * The key is added to the io_keys list in the client structure, and also
+ * in the hash table mapping swapped keys to waiting clients, that is,
+ * server.io_waited_keys. */
+static int waitForSwappedKey(redisClient *c, robj *key) {
+ struct dictEntry *de;
+ robj *o;
+ list *l;
+
+ /* If the key does not exist or is already in RAM we don't need to
+ * block the client at all. */
+ de = dictFind(c->db->dict,key);
+ if (de == NULL) return 0;
+ o = dictGetEntryKey(de);
+ if (o->storage == REDIS_VM_MEMORY) {
+ return 0;
+ } else if (o->storage == REDIS_VM_SWAPPING) {
+ /* We were swapping the key, undo it! */
+ vmCancelThreadedIOJob(o);
+ return 0;
+ }
+
+ /* OK: the key is either swapped, or being loaded just now. */
+
+ /* Add the key to the list of keys this client is waiting for.
+ * This maps clients to keys they are waiting for. */
+ listAddNodeTail(c->io_keys,key);
+ incrRefCount(key);
+
+ /* Add the client to the swapped keys => clients waiting map. */
+ de = dictFind(c->db->io_keys,key);
+ if (de == NULL) {
+ int retval;
+
+ /* For every key we take a list of clients blocked for it */
+ l = listCreate();
+ retval = dictAdd(c->db->io_keys,key,l);
+ incrRefCount(key);
+ assert(retval == DICT_OK);
+ } else {
+ l = dictGetEntryVal(de);
+ }
+ listAddNodeTail(l,c);
+
+ /* Are we already loading the key from disk? If not create a job */
+ if (o->storage == REDIS_VM_SWAPPED) {
+ iojob *j;
+
+ o->storage = REDIS_VM_LOADING;
+ j = zmalloc(sizeof(*j));
+ j->type = REDIS_IOJOB_LOAD;
+ j->db = c->db;
+ j->key = dupStringObject(key);
+ j->key->vtype = o->vtype;
+ j->page = o->vm.page;
+ j->val = NULL;
+ j->canceled = 0;
+ j->thread = (pthread_t) -1;
+ lockThreadedIO();
+ queueIOJob(j);
+ unlockThreadedIO();
+ }
+ return 1;
+}
+
+/* Is this client attempting to run a command against swapped keys?
+ * If so, block it ASAP, load the keys in background, then resume it.
+ *
+ * The important idea about this function is that it can fail! If keys will
+ * still be swapped when the client is resumed, this key lookups will
+ * just block loading keys from disk. In practical terms this should only
+ * happen with SORT BY command or if there is a bug in this function.
+ *
+ * Return 1 if the client is marked as blocked, 0 if the client can
+ * continue as the keys it is going to access appear to be in memory. */
+static int blockClientOnSwappedKeys(struct redisCommand *cmd, redisClient *c) {
+ int j, last;
+
+ if (cmd->vm_firstkey == 0) return 0;
+ last = cmd->vm_lastkey;
+ if (last < 0) last = c->argc+last;
+ for (j = cmd->vm_firstkey; j <= last; j += cmd->vm_keystep)
+ waitForSwappedKey(c,c->argv[j]);
+ /* If the client was blocked for at least one key, mark it as blocked. */
+ if (listLength(c->io_keys)) {
+ c->flags |= REDIS_IO_WAIT;
+ aeDeleteFileEvent(server.el,c->fd,AE_READABLE);
+ server.vm_blocked_clients++;
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+/* Remove the 'key' from the list of blocked keys for a given client.
+ *
+ * The function returns 1 when there are no longer blocking keys after
+ * the current one was removed (and the client can be unblocked). */
+static int dontWaitForSwappedKey(redisClient *c, robj *key) {
+ list *l;
+ listNode *ln;
+ listIter li;
+ struct dictEntry *de;
+
+ /* Remove the key from the list of keys this client is waiting for. */
+ listRewind(c->io_keys,&li);
+ while ((ln = listNext(&li)) != NULL) {
+ if (compareStringObjects(ln->value,key) == 0) {
+ listDelNode(c->io_keys,ln);
+ break;
+ }
+ }
+ assert(ln != NULL);
+
+ /* Remove the client form the key => waiting clients map. */
+ de = dictFind(c->db->io_keys,key);
+ assert(de != NULL);
+ l = dictGetEntryVal(de);
+ ln = listSearchKey(l,c);
+ assert(ln != NULL);
+ listDelNode(l,ln);
+ if (listLength(l) == 0)
+ dictDelete(c->db->io_keys,key);
+
+ return listLength(c->io_keys) == 0;
+}
+
+static void handleClientsBlockedOnSwappedKey(redisDb *db, robj *key) {
+ struct dictEntry *de;
+ list *l;
+ listNode *ln;
+ int len;
+
+ de = dictFind(db->io_keys,key);
+ if (!de) return;
+
+ l = dictGetEntryVal(de);
+ len = listLength(l);
+ /* Note: we can't use something like while(listLength(l)) as the list
+ * can be freed by the calling function when we remove the last element. */
+ while (len--) {
+ ln = listFirst(l);
+ redisClient *c = ln->value;
+
+ if (dontWaitForSwappedKey(c,key)) {
+ /* Put the client in the list of clients ready to go as we
+ * loaded all the keys about it. */
+ listAddNodeTail(server.io_ready_clients,c);
+ }
+ }
+}
+
/* ================================= Debugging ============================== */
static void debugCommand(redisClient *c) {
}
key = dictGetEntryKey(de);
val = dictGetEntryVal(de);
- if (server.vm_enabled && (key->storage == REDIS_VM_MEMORY ||
- key->storage == REDIS_VM_SWAPPING)) {
+ if (!server.vm_enabled || (key->storage == REDIS_VM_MEMORY ||
+ key->storage == REDIS_VM_SWAPPING)) {
addReplySds(c,sdscatprintf(sdsempty(),
"+Key at:%p refcount:%d, value at:%p refcount:%d "
"encoding:%d serializedlength:%lld\r\n",
(void*)key, key->refcount, (void*)val, val->refcount,
- val->encoding, rdbSavedObjectLen(val,NULL)));
+ val->encoding, (long long) rdbSavedObjectLen(val,NULL)));
} else {
addReplySds(c,sdscatprintf(sdsempty(),
"+Key at:%p refcount:%d, value swapped at: page %llu "
}
}
-static void _redisAssert(char *estr) {
+static void _redisAssert(char *estr, char *file, int line) {
redisLog(REDIS_WARNING,"=== ASSERTION FAILED ===");
- redisLog(REDIS_WARNING,"==> %s\n",estr);
+ redisLog(REDIS_WARNING,"==> %s:%d '%s' is not true\n",file,line,estr);
#ifdef HAVE_BACKTRACE
redisLog(REDIS_WARNING,"(forcing SIGSEGV in order to print the stack trace)");
*((char*)-1) = 'x';
}
int main(int argc, char **argv) {
+ time_t start;
+
initServerConfig();
if (argc == 2) {
resetServerSaveParams();
#ifdef __linux__
linuxOvercommitMemoryWarning();
#endif
+ start = time(NULL);
if (server.appendonly) {
if (loadAppendOnlyFile(server.appendfilename) == REDIS_OK)
- redisLog(REDIS_NOTICE,"DB loaded from append only file");
+ redisLog(REDIS_NOTICE,"DB loaded from append only file: %ld seconds",time(NULL)-start);
} else {
if (rdbLoad(server.dbfilename) == REDIS_OK)
- redisLog(REDIS_NOTICE,"DB loaded from disk");
+ redisLog(REDIS_NOTICE,"DB loaded from disk: %ld seconds",time(NULL)-start);
}
redisLog(REDIS_NOTICE,"The server is now ready to accept connections on port %d", server.port);
+ aeSetBeforeSleepProc(server.el,beforeSleep);
aeMain(server.el);
aeDeleteEventLoop(server.el);
return 0;
#else
return (void*) uc->uc_mcontext->__ss.__eip;
#endif
-#elif defined(__i386__) || defined(__X86_64__) || defined(__x86_64__)
+#elif defined(__i386__) || defined(__X86_64__) || defined(__x86_64__)
return (void*) uc->uc_mcontext.gregs[REG_EIP]; /* Linux 32/64 bit */
#elif defined(__ia64__) /* Linux IA64 */
return (void*) uc->uc_mcontext.sc_ip;
}
}
/* free(messages); Don't call free() with possibly corrupted memory. */
- exit(0);
+ _exit(0);
}
static void setupSigSegvAction(void) {
projects / redis.git / blobdiff