#include <float.h>
#include <math.h>
#include <sys/resource.h>
+#include <sys/utsname.h>
/* Our shared "common" objects */
* s: command not allowed in scripts.
* R: random command. Command is not deterministic, that is, the same command
* with the same arguments, with the same key space, may have different
- * results. For instance SPOP and RANDOMKEY are two random commands. */
+ * results. For instance SPOP and RANDOMKEY are two random commands.
+ * S: Sort command output array if called from script, so that the output
+ * is deterministic.
+ */
struct redisCommand redisCommandTable[] = {
{"get",getCommand,2,"r",0,NULL,1,1,1,0,0},
{"set",setCommand,3,"wm",0,noPreloadGetKeys,1,1,1,0,0},
{"scard",scardCommand,2,"r",0,NULL,1,1,1,0,0},
{"spop",spopCommand,2,"wRs",0,NULL,1,1,1,0,0},
{"srandmember",srandmemberCommand,2,"rR",0,NULL,1,1,1,0,0},
- {"sinter",sinterCommand,-2,"r",0,NULL,1,-1,1,0,0},
+ {"sinter",sinterCommand,-2,"rS",0,NULL,1,-1,1,0,0},
{"sinterstore",sinterstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},
- {"sunion",sunionCommand,-2,"r",0,NULL,1,-1,1,0,0},
+ {"sunion",sunionCommand,-2,"rS",0,NULL,1,-1,1,0,0},
{"sunionstore",sunionstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},
- {"sdiff",sdiffCommand,-2,"r",0,NULL,1,-1,1,0,0},
+ {"sdiff",sdiffCommand,-2,"rS",0,NULL,1,-1,1,0,0},
{"sdiffstore",sdiffstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},
- {"smembers",sinterCommand,2,"r",0,NULL,1,1,1,0,0},
+ {"smembers",sinterCommand,2,"rS",0,NULL,1,1,1,0,0},
{"zadd",zaddCommand,-4,"wm",0,NULL,1,1,1,0,0},
{"zincrby",zincrbyCommand,4,"wm",0,NULL,1,1,1,0,0},
{"zrem",zremCommand,-3,"w",0,NULL,1,1,1,0,0},
{"hincrbyfloat",hincrbyfloatCommand,4,"wm",0,NULL,1,1,1,0,0},
{"hdel",hdelCommand,-3,"w",0,NULL,1,1,1,0,0},
{"hlen",hlenCommand,2,"r",0,NULL,1,1,1,0,0},
- {"hkeys",hkeysCommand,2,"r",0,NULL,1,1,1,0,0},
- {"hvals",hvalsCommand,2,"r",0,NULL,1,1,1,0,0},
+ {"hkeys",hkeysCommand,2,"rS",0,NULL,1,1,1,0,0},
+ {"hvals",hvalsCommand,2,"rS",0,NULL,1,1,1,0,0},
{"hgetall",hgetallCommand,2,"r",0,NULL,1,1,1,0,0},
{"hexists",hexistsCommand,3,"r",0,NULL,1,1,1,0,0},
{"incrby",incrbyCommand,3,"wm",0,NULL,1,1,1,0,0},
{"expireat",expireatCommand,3,"w",0,NULL,1,1,1,0,0},
{"pexpire",pexpireCommand,3,"w",0,NULL,1,1,1,0,0},
{"pexpireat",pexpireatCommand,3,"w",0,NULL,1,1,1,0,0},
- {"keys",keysCommand,2,"r",0,NULL,0,0,0,0,0},
+ {"keys",keysCommand,2,"rS",0,NULL,0,0,0,0,0},
{"dbsize",dbsizeCommand,1,"r",0,NULL,0,0,0,0,0},
{"auth",authCommand,2,"rs",0,NULL,0,0,0,0,0},
{"ping",pingCommand,1,"r",0,NULL,0,0,0,0,0},
{"lastsave",lastsaveCommand,1,"r",0,NULL,0,0,0,0,0},
{"type",typeCommand,2,"r",0,NULL,1,1,1,0,0},
{"multi",multiCommand,1,"rs",0,NULL,0,0,0,0,0},
- {"exec",execCommand,1,"wms",0,NULL,0,0,0,0,0},
+ {"exec",execCommand,1,"s",0,NULL,0,0,0,0,0},
{"discard",discardCommand,1,"rs",0,NULL,0,0,0,0,0},
{"sync",syncCommand,1,"ars",0,NULL,0,0,0,0,0},
{"flushdb",flushdbCommand,1,"w",0,NULL,0,0,0,0,0},
{"flushall",flushallCommand,1,"w",0,NULL,0,0,0,0,0},
- {"sort",sortCommand,-2,"wm",0,NULL,1,1,1,0,0},
+ {"sort",sortCommand,-2,"wmS",0,NULL,1,1,1,0,0},
{"info",infoCommand,-1,"r",0,NULL,0,0,0,0,0},
{"monitor",monitorCommand,1,"ars",0,NULL,0,0,0,0,0},
{"ttl",ttlCommand,2,"r",0,NULL,1,1,1,0,0},
{"pttl",pttlCommand,2,"r",0,NULL,1,1,1,0,0},
{"persist",persistCommand,2,"w",0,NULL,1,1,1,0,0},
- {"slaveof",slaveofCommand,3,"aws",0,NULL,0,0,0,0,0},
- {"debug",debugCommand,-2,"aws",0,NULL,0,0,0,0,0},
+ {"slaveof",slaveofCommand,3,"as",0,NULL,0,0,0,0,0},
+ {"debug",debugCommand,-2,"as",0,NULL,0,0,0,0,0},
{"config",configCommand,-2,"ar",0,NULL,0,0,0,0,0},
{"subscribe",subscribeCommand,-2,"rps",0,NULL,0,0,0,0,0},
{"unsubscribe",unsubscribeCommand,-1,"rps",0,NULL,0,0,0,0,0},
{"psubscribe",psubscribeCommand,-2,"rps",0,NULL,0,0,0,0,0},
{"punsubscribe",punsubscribeCommand,-1,"rps",0,NULL,0,0,0,0,0},
- {"publish",publishCommand,3,"rpf",0,NULL,0,0,0,0,0},
+ {"publish",publishCommand,3,"pf",0,NULL,0,0,0,0,0},
{"watch",watchCommand,-2,"rs",0,noPreloadGetKeys,1,-1,1,0,0},
{"unwatch",unwatchCommand,1,"rs",0,NULL,0,0,0,0,0},
- {"cluster",clusterCommand,-2,"ar",0,NULL,0,0,0,0,0},
{"restore",restoreCommand,4,"awm",0,NULL,1,1,1,0,0},
{"migrate",migrateCommand,6,"aw",0,NULL,0,0,0,0,0},
- {"asking",askingCommand,1,"r",0,NULL,0,0,0,0,0},
{"dump",dumpCommand,2,"ar",0,NULL,1,1,1,0,0},
{"object",objectCommand,-2,"r",0,NULL,2,2,2,0,0},
{"client",clientCommand,-2,"ar",0,NULL,0,0,0,0,0},
- {"eval",evalCommand,-3,"wms",0,zunionInterGetKeys,0,0,0,0,0},
- {"evalsha",evalShaCommand,-3,"wms",0,zunionInterGetKeys,0,0,0,0,0},
+ {"eval",evalCommand,-3,"s",0,zunionInterGetKeys,0,0,0,0,0},
+ {"evalsha",evalShaCommand,-3,"s",0,zunionInterGetKeys,0,0,0,0,0},
{"slowlog",slowlogCommand,-2,"r",0,NULL,0,0,0,0,0},
- {"script",scriptCommand,-2,"ras",0,NULL,0,0,0,0,0}
+ {"script",scriptCommand,-2,"ras",0,NULL,0,0,0,0,0},
+ {"time",timeCommand,1,"rR",0,NULL,0,0,0,0,0}
};
/*============================ Utility functions ============================ */
void redisLogRaw(int level, const char *msg) {
const int syslogLevelMap[] = { LOG_DEBUG, LOG_INFO, LOG_NOTICE, LOG_WARNING };
const char *c = ".-*#";
- time_t now = time(NULL);
FILE *fp;
char buf[64];
int rawmode = (level & REDIS_LOG_RAW);
if (rawmode) {
fprintf(fp,"%s",msg);
} else {
- strftime(buf,sizeof(buf),"%d %b %H:%M:%S",localtime(&now));
+ int off;
+ struct timeval tv;
+
+ gettimeofday(&tv,NULL);
+ off = strftime(buf,sizeof(buf),"%d %b %H:%M:%S.",localtime(&tv.tv_sec));
+ snprintf(buf+off,sizeof(buf)-off,"%03d",(int)tv.tv_usec/1000);
fprintf(fp,"[%d] %s %c %s\n",(int)getpid(),buf,c[level],msg);
}
fflush(fp);
redisLogRaw(level,msg);
}
+/* Log a fixed message without printf-alike capabilities, in a way that is
+ * safe to call from a signal handler.
+ *
+ * We actually use this only for signals that are not fatal from the point
+ * of view of Redis. Signals that are going to kill the server anyway and
+ * where we need printf-alike features are served by redisLog(). */
+void redisLogFromHandler(int level, const char *msg) {
+ int fd;
+ char buf[64];
+
+ if ((level&0xff) < server.verbosity ||
+ (server.logfile == NULL && server.daemonize)) return;
+ fd = server.logfile ?
+ open(server.logfile, O_APPEND|O_CREAT|O_WRONLY, 0644) :
+ STDOUT_FILENO;
+ if (fd == -1) return;
+ ll2string(buf,sizeof(buf),getpid());
+ if (write(fd,"[",1) == -1) goto err;
+ if (write(fd,buf,strlen(buf)) == -1) goto err;
+ if (write(fd," | signal handler] (",20) == -1) goto err;
+ ll2string(buf,sizeof(buf),time(NULL));
+ if (write(fd,buf,strlen(buf)) == -1) goto err;
+ if (write(fd,") ",2) == -1) goto err;
+ if (write(fd,msg,strlen(msg)) == -1) goto err;
+ if (write(fd,"\n",1) == -1) goto err;
+err:
+ if (server.logfile) close(fd);
+}
+
/* Redis generally does not try to recover from out of memory conditions
* when allocating objects or strings, it is not clear if it will be possible
* to report this condition to the client since the networking layer itself
return ustime()/1000;
}
+/* After an RDB dump or AOF rewrite we exit from children using _exit() instead of
+ * exit(), because the latter may interact with the same file objects used by
+ * the parent process. However if we are testing the coverage normal exit() is
+ * used in order to obtain the right coverage information. */
+void exitFromChild(int retcode) {
+#ifdef COVERAGE_TEST
+ exit(retcode);
+#else
+ _exit(retcode);
+#endif
+}
+
/*====================== Hash table type implementation ==================== */
/* This is an hash table type that uses the SDS dynamic strings libary as
dictListDestructor /* val destructor */
};
-/* Cluster nodes hash table, mapping nodes addresses 1.2.3.4:6379 to
- * clusterNode structures. */
-dictType clusterNodesDictType = {
- dictSdsHash, /* hash function */
- NULL, /* key dup */
- NULL, /* val dup */
- dictSdsKeyCompare, /* key compare */
- dictSdsDestructor, /* key destructor */
- NULL /* val destructor */
-};
-
int htNeedsResize(dict *dict) {
long long size, used;
int j;
for (j = 0; j < server.dbnum; j++) {
+ /* Keys dictionary */
if (dictIsRehashing(server.db[j].dict)) {
dictRehashMilliseconds(server.db[j].dict,1);
break; /* already used our millisecond for this loop... */
}
+ /* Expires */
+ if (dictIsRehashing(server.db[j].expires)) {
+ dictRehashMilliseconds(server.db[j].expires,1);
+ break; /* already used our millisecond for this loop... */
+ }
}
}
* keys that can be removed from the keyspace. */
void activeExpireCycle(void) {
int j;
+ long long start = ustime(), timelimit;
+
+ /* We can use at max REDIS_EXPIRELOOKUPS_TIME_PERC percentage of CPU time
+ * per iteration. Since this function gets called with a frequency of
+ * REDIS_HZ times per second, the following is the max amount of
+ * microseconds we can spend in this function. */
+ timelimit = 1000000*REDIS_EXPIRELOOKUPS_TIME_PERC/REDIS_HZ/100;
+ if (timelimit <= 0) timelimit = 1;
for (j = 0; j < server.dbnum; j++) {
- int expired;
+ int expired, iteration = 0;
redisDb *db = server.db+j;
/* Continue to expire if at the end of the cycle more than 25%
* of the keys were expired. */
do {
- long num = dictSize(db->expires);
+ unsigned long num = dictSize(db->expires);
+ unsigned long slots = dictSlots(db->expires);
long long now = mstime();
+ /* When there are less than 1% filled slots getting random
+ * keys is expensive, so stop here waiting for better times...
+ * The dictionary will be resized asap. */
+ if (num && slots > DICT_HT_INITIAL_SIZE &&
+ (num*100/slots < 1)) break;
+
expired = 0;
if (num > REDIS_EXPIRELOOKUPS_PER_CRON)
num = REDIS_EXPIRELOOKUPS_PER_CRON;
server.stat_expiredkeys++;
}
}
+ /* We can't block forever here even if there are many keys to
+ * expire. So after a given amount of milliseconds return to the
+ * caller waiting for the other active expire cycle. */
+ iteration++;
+ if ((iteration & 0xff) == 0 && /* Check once every 255 iterations */
+ (ustime()-start) > timelimit) return;
} while (expired > REDIS_EXPIRELOOKUPS_PER_CRON/4);
}
}
void updateLRUClock(void) {
- server.lruclock = (time(NULL)/REDIS_LRU_CLOCK_RESOLUTION) &
+ server.lruclock = (server.unixtime/REDIS_LRU_CLOCK_RESOLUTION) &
REDIS_LRU_CLOCK_MAX;
}
+
+/* Add a sample to the operations per second array of samples. */
+void trackOperationsPerSecond(void) {
+ long long t = mstime() - server.ops_sec_last_sample_time;
+ long long ops = server.stat_numcommands - server.ops_sec_last_sample_ops;
+ long long ops_sec;
+
+ ops_sec = t > 0 ? (ops*1000/t) : 0;
+
+ server.ops_sec_samples[server.ops_sec_idx] = ops_sec;
+ server.ops_sec_idx = (server.ops_sec_idx+1) % REDIS_OPS_SEC_SAMPLES;
+ server.ops_sec_last_sample_time = mstime();
+ server.ops_sec_last_sample_ops = server.stat_numcommands;
+}
+
+/* Return the mean of all the samples. */
+long long getOperationsPerSecond(void) {
+ int j;
+ long long sum = 0;
+
+ for (j = 0; j < REDIS_OPS_SEC_SAMPLES; j++)
+ sum += server.ops_sec_samples[j];
+ return sum / REDIS_OPS_SEC_SAMPLES;
+}
+
+/* Check for timeouts. Returns non-zero if the client was terminated */
+int clientsCronHandleTimeout(redisClient *c) {
+ time_t now = server.unixtime;
+
+ if (server.maxidletime &&
+ !(c->flags & REDIS_SLAVE) && /* no timeout for slaves */
+ !(c->flags & REDIS_MASTER) && /* no timeout for masters */
+ !(c->flags & REDIS_BLOCKED) && /* no timeout for BLPOP */
+ dictSize(c->pubsub_channels) == 0 && /* no timeout for pubsub */
+ listLength(c->pubsub_patterns) == 0 &&
+ (now - c->lastinteraction > server.maxidletime))
+ {
+ redisLog(REDIS_VERBOSE,"Closing idle client");
+ freeClient(c);
+ return 1;
+ } else if (c->flags & REDIS_BLOCKED) {
+ if (c->bpop.timeout != 0 && c->bpop.timeout < now) {
+ addReply(c,shared.nullmultibulk);
+ unblockClientWaitingData(c);
+ }
+ }
+ return 0;
+}
+
+/* The client query buffer is an sds.c string that can end with a lot of
+ * free space not used, this function reclaims space if needed.
+ *
+ * The funciton always returns 0 as it never terminates the client. */
+int clientsCronResizeQueryBuffer(redisClient *c) {
+ size_t querybuf_size = sdsAllocSize(c->querybuf);
+ time_t idletime = server.unixtime - c->lastinteraction;
+
+ /* There are two conditions to resize the query buffer:
+ * 1) Query buffer is > BIG_ARG and too big for latest peak.
+ * 2) Client is inactive and the buffer is bigger than 1k. */
+ if (((querybuf_size > REDIS_MBULK_BIG_ARG) &&
+ (querybuf_size/(c->querybuf_peak+1)) > 2) ||
+ (querybuf_size > 1024 && idletime > 2))
+ {
+ /* Only resize the query buffer if it is actually wasting space. */
+ if (sdsavail(c->querybuf) > 1024) {
+ c->querybuf = sdsRemoveFreeSpace(c->querybuf);
+ }
+ }
+ /* Reset the peak again to capture the peak memory usage in the next
+ * cycle. */
+ c->querybuf_peak = 0;
+ return 0;
+}
+
+void clientsCron(void) {
+ /* Make sure to process at least 1/(REDIS_HZ*10) of clients per call.
+ * Since this function is called REDIS_HZ times per second we are sure that
+ * in the worst case we process all the clients in 10 seconds.
+ * In normal conditions (a reasonable number of clients) we process
+ * all the clients in a shorter time. */
+ int numclients = listLength(server.clients);
+ int iterations = numclients/(REDIS_HZ*10);
+
+ if (iterations < 50)
+ iterations = (numclients < 50) ? numclients : 50;
+ while(listLength(server.clients) && iterations--) {
+ redisClient *c;
+ listNode *head;
+
+ /* Rotate the list, take the current head, process.
+ * This way if the client must be removed from the list it's the
+ * first element and we don't incur into O(N) computation. */
+ listRotate(server.clients);
+ head = listFirst(server.clients);
+ c = listNodeValue(head);
+ /* The following functions do different service checks on the client.
+ * The protocol is that they return non-zero if the client was
+ * terminated. */
+ if (clientsCronHandleTimeout(c)) continue;
+ if (clientsCronResizeQueryBuffer(c)) continue;
+ }
+}
+
+/* This is our timer interrupt, called REDIS_HZ times per second.
+ * Here is where we do a number of things that need to be done asynchronously.
+ * For instance:
+ *
+ * - Active expired keys collection (it is also performed in a lazy way on
+ * lookup).
+ * - Software watchdong.
+ * - Update some statistic.
+ * - Incremental rehashing of the DBs hash tables.
+ * - Triggering BGSAVE / AOF rewrite, and handling of terminated children.
+ * - Clients timeout of differnet kinds.
+ * - Replication reconnection.
+ * - Many more...
+ *
+ * Everything directly called here will be called REDIS_HZ times per second,
+ * so in order to throttle execution of things we want to do less frequently
+ * a macro is used: run_with_period(milliseconds) { .... }
+ */
+
+/* Using the following macro you can run code inside serverCron() with the
+ * specified period, specified in milliseconds.
+ * The actual resolution depends on REDIS_HZ. */
+#define run_with_period(_ms_) if (!(loops % ((_ms_)/(1000/REDIS_HZ))))
+
int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
int j, loops = server.cronloops;
REDIS_NOTUSED(eventLoop);
REDIS_NOTUSED(id);
REDIS_NOTUSED(clientData);
+ /* Software watchdog: deliver the SIGALRM that will reach the signal
+ * handler if we don't return here fast enough. */
+ if (server.watchdog_period) watchdogScheduleSignal(server.watchdog_period);
+
/* We take a cached value of the unix time in the global state because
* with virtual memory and aging there is to store the current time
* in objects at every object access, and accuracy is not needed.
* To access a global var is faster than calling time(NULL) */
server.unixtime = time(NULL);
+ run_with_period(100) trackOperationsPerSecond();
+
/* We have just 22 bits per object for LRU information.
* So we use an (eventually wrapping) LRU clock with 10 seconds resolution.
* 2^22 bits with 10 seconds resoluton is more or less 1.5 years.
}
/* Show some info about non-empty databases */
- for (j = 0; j < server.dbnum; j++) {
- long long size, used, vkeys;
-
- size = dictSlots(server.db[j].dict);
- used = dictSize(server.db[j].dict);
- vkeys = dictSize(server.db[j].expires);
- if (!(loops % 50) && (used || vkeys)) {
- redisLog(REDIS_VERBOSE,"DB %d: %lld keys (%lld volatile) in %lld slots HT.",j,used,vkeys,size);
- /* dictPrintStats(server.dict); */
+ run_with_period(5000) {
+ for (j = 0; j < server.dbnum; j++) {
+ long long size, used, vkeys;
+
+ size = dictSlots(server.db[j].dict);
+ used = dictSize(server.db[j].dict);
+ vkeys = dictSize(server.db[j].expires);
+ if (used || vkeys) {
+ redisLog(REDIS_VERBOSE,"DB %d: %lld keys (%lld volatile) in %lld slots HT.",j,used,vkeys,size);
+ /* dictPrintStats(server.dict); */
+ }
}
}
* a lot of memory movements in the parent will cause a lot of pages
* copied. */
if (server.rdb_child_pid == -1 && server.aof_child_pid == -1) {
- if (!(loops % 10)) tryResizeHashTables();
+ tryResizeHashTables();
if (server.activerehashing) incrementallyRehash();
}
/* Show information about connected clients */
- if (!(loops % 50)) {
+ run_with_period(5000) {
redisLog(REDIS_VERBOSE,"%d clients connected (%d slaves), %zu bytes in use",
listLength(server.clients)-listLength(server.slaves),
listLength(server.slaves),
zmalloc_used_memory());
}
- /* Close connections of timedout clients */
- if ((server.maxidletime && !(loops % 100)) || server.bpop_blocked_clients)
- closeTimedoutClients();
+ /* We need to do a few operations on clients asynchronously. */
+ clientsCron();
/* Start a scheduled AOF rewrite if this was requested by the user while
* a BGSAVE was in progress. */
updateDictResizePolicy();
}
} else {
- time_t now = time(NULL);
-
/* If there is not a background saving/rewrite in progress check if
* we have to save/rewrite now */
for (j = 0; j < server.saveparamslen; j++) {
struct saveparam *sp = server.saveparams+j;
if (server.dirty >= sp->changes &&
- now-server.lastsave > sp->seconds) {
+ server.unixtime-server.lastsave > sp->seconds) {
redisLog(REDIS_NOTICE,"%d changes in %d seconds. Saving...",
sp->changes, sp->seconds);
rdbSaveBackground(server.rdb_filename);
* in order to guarantee a strict consistency. */
if (server.masterhost == NULL) activeExpireCycle();
+ /* Close clients that need to be closed asynchronous */
+ freeClientsInAsyncFreeQueue();
+
/* Replication cron function -- used to reconnect to master and
* to detect transfer failures. */
- if (!(loops % 10)) replicationCron();
-
- /* Run other sub-systems specific cron jobs */
- if (server.cluster_enabled && !(loops % 10)) clusterCron();
+ run_with_period(1000) replicationCron();
server.cronloops++;
- return 100;
+ return 1000/REDIS_HZ;
}
/* This function gets called every time Redis is entering the
"-LOADING Redis is loading the dataset in memory\r\n"));
shared.slowscripterr = createObject(REDIS_STRING,sdsnew(
"-BUSY Redis is busy running a script. You can only call SCRIPT KILL or SHUTDOWN NOSAVE.\r\n"));
+ shared.masterdownerr = createObject(REDIS_STRING,sdsnew(
+ "-MASTERDOWN Link with MASTER is down and slave-serve-stale-data is set to 'no'.\r\n"));
+ shared.bgsaveerr = createObject(REDIS_STRING,sdsnew(
+ "-MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details about the error.\r\n"));
+ shared.roslaveerr = createObject(REDIS_STRING,sdsnew(
+ "-READONLY You can't write against a read only slave.\r\n"));
+ shared.oomerr = createObject(REDIS_STRING,sdsnew(
+ "-OOM command not allowed when used memory > 'maxmemory'.\r\n"));
shared.space = createObject(REDIS_STRING,sdsnew(" "));
shared.colon = createObject(REDIS_STRING,sdsnew(":"));
shared.plus = createObject(REDIS_STRING,sdsnew("+"));
- shared.select0 = createStringObject("select 0\r\n",10);
- shared.select1 = createStringObject("select 1\r\n",10);
- shared.select2 = createStringObject("select 2\r\n",10);
- shared.select3 = createStringObject("select 3\r\n",10);
- shared.select4 = createStringObject("select 4\r\n",10);
- shared.select5 = createStringObject("select 5\r\n",10);
- shared.select6 = createStringObject("select 6\r\n",10);
- shared.select7 = createStringObject("select 7\r\n",10);
- shared.select8 = createStringObject("select 8\r\n",10);
- shared.select9 = createStringObject("select 9\r\n",10);
+
+ for (j = 0; j < REDIS_SHARED_SELECT_CMDS; j++) {
+ shared.select[j] = createObject(REDIS_STRING,
+ sdscatprintf(sdsempty(),"select %d\r\n", j));
+ }
shared.messagebulk = createStringObject("$7\r\nmessage\r\n",13);
shared.pmessagebulk = createStringObject("$8\r\npmessage\r\n",14);
shared.subscribebulk = createStringObject("$9\r\nsubscribe\r\n",15);
shared.unsubscribebulk = createStringObject("$11\r\nunsubscribe\r\n",18);
shared.psubscribebulk = createStringObject("$10\r\npsubscribe\r\n",17);
shared.punsubscribebulk = createStringObject("$12\r\npunsubscribe\r\n",19);
- shared.mbulk3 = createStringObject("*3\r\n",4);
- shared.mbulk4 = createStringObject("*4\r\n",4);
+ shared.del = createStringObject("DEL",3);
+ shared.rpop = createStringObject("RPOP",4);
+ shared.lpop = createStringObject("LPOP",4);
for (j = 0; j < REDIS_SHARED_INTEGERS; j++) {
shared.integers[j] = createObject(REDIS_STRING,(void*)(long)j);
shared.integers[j]->encoding = REDIS_ENCODING_INT;
}
+ for (j = 0; j < REDIS_SHARED_BULKHDR_LEN; j++) {
+ shared.mbulkhdr[j] = createObject(REDIS_STRING,
+ sdscatprintf(sdsempty(),"*%d\r\n",j));
+ shared.bulkhdr[j] = createObject(REDIS_STRING,
+ sdscatprintf(sdsempty(),"$%d\r\n",j));
+ }
}
void initServerConfig() {
+ getRandomHexChars(server.runid,REDIS_RUN_ID_SIZE);
+ server.runid[REDIS_RUN_ID_SIZE] = '\0';
+ server.arch_bits = (sizeof(long) == 8) ? 64 : 32;
server.port = REDIS_SERVERPORT;
server.bindaddr = NULL;
server.unixsocket = NULL;
server.aof_rewrite_base_size = 0;
server.aof_rewrite_scheduled = 0;
server.aof_last_fsync = time(NULL);
+ server.aof_delayed_fsync = 0;
server.aof_fd = -1;
server.aof_selected_db = -1; /* Make sure the first time will not match */
server.aof_flush_postponed_start = 0;
server.aof_filename = zstrdup("appendonly.aof");
server.requirepass = NULL;
server.rdb_compression = 1;
+ server.rdb_checksum = 1;
server.activerehashing = 1;
server.maxclients = REDIS_MAX_CLIENTS;
server.bpop_blocked_clients = 0;
server.maxmemory = 0;
server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_LRU;
server.maxmemory_samples = 3;
- server.hash_max_zipmap_entries = REDIS_HASH_MAX_ZIPMAP_ENTRIES;
- server.hash_max_zipmap_value = REDIS_HASH_MAX_ZIPMAP_VALUE;
+ server.hash_max_ziplist_entries = REDIS_HASH_MAX_ZIPLIST_ENTRIES;
+ server.hash_max_ziplist_value = REDIS_HASH_MAX_ZIPLIST_VALUE;
server.list_max_ziplist_entries = REDIS_LIST_MAX_ZIPLIST_ENTRIES;
server.list_max_ziplist_value = REDIS_LIST_MAX_ZIPLIST_VALUE;
server.set_max_intset_entries = REDIS_SET_MAX_INTSET_ENTRIES;
server.shutdown_asap = 0;
server.repl_ping_slave_period = REDIS_REPL_PING_SLAVE_PERIOD;
server.repl_timeout = REDIS_REPL_TIMEOUT;
- server.cluster_enabled = 0;
- server.cluster.configfile = zstrdup("nodes.conf");
server.lua_caller = NULL;
server.lua_time_limit = REDIS_LUA_TIME_LIMIT;
server.lua_client = NULL;
server.repl_state = REDIS_REPL_NONE;
server.repl_syncio_timeout = REDIS_REPL_SYNCIO_TIMEOUT;
server.repl_serve_stale_data = 1;
- server.repl_down_since = -1;
+ server.repl_slave_ro = 1;
+ server.repl_down_since = time(NULL);
+
+ /* Client output buffer limits */
+ server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_NORMAL].hard_limit_bytes = 0;
+ server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_NORMAL].soft_limit_bytes = 0;
+ server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_NORMAL].soft_limit_seconds = 0;
+ server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_SLAVE].hard_limit_bytes = 1024*1024*256;
+ server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_SLAVE].soft_limit_bytes = 1024*1024*64;
+ server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_SLAVE].soft_limit_seconds = 60;
+ server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_PUBSUB].hard_limit_bytes = 1024*1024*32;
+ server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_PUBSUB].soft_limit_bytes = 1024*1024*8;
+ server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_PUBSUB].soft_limit_seconds = 60;
/* Double constants initialization */
R_Zero = 0.0;
populateCommandTable();
server.delCommand = lookupCommandByCString("del");
server.multiCommand = lookupCommandByCString("multi");
+ server.lpushCommand = lookupCommandByCString("lpush");
/* Slow log */
server.slowlog_log_slower_than = REDIS_SLOWLOG_LOG_SLOWER_THAN;
server.slowlog_max_len = REDIS_SLOWLOG_MAX_LEN;
- /* Assert */
+ /* Debugging */
server.assert_failed = "<no assertion failed>";
server.assert_file = "<no file>";
server.assert_line = 0;
server.bug_report_start = 0;
+ server.watchdog_period = 0;
}
/* This function will try to raise the max number of open files accordingly to
rlim_t maxfiles = server.maxclients+32;
struct rlimit limit;
- if (maxfiles < 1024) maxfiles = 1024;
if (getrlimit(RLIMIT_NOFILE,&limit) == -1) {
redisLog(REDIS_WARNING,"Unable to obtain the current NOFILE limit (%s), assuming 1024 and setting the max clients configuration accordingly.",
strerror(errno));
/* Set the max number of files if the current limit is not enough
* for our needs. */
if (oldlimit < maxfiles) {
- limit.rlim_cur = maxfiles;
- limit.rlim_max = maxfiles;
- if (setrlimit(RLIMIT_NOFILE,&limit) == -1) {
- server.maxclients = oldlimit-32;
+ rlim_t f;
+
+ f = maxfiles;
+ while(f > oldlimit) {
+ limit.rlim_cur = f;
+ limit.rlim_max = f;
+ if (setrlimit(RLIMIT_NOFILE,&limit) != -1) break;
+ f -= 128;
+ }
+ if (f < oldlimit) f = oldlimit;
+ if (f != maxfiles) {
+ server.maxclients = f-32;
redisLog(REDIS_WARNING,"Unable to set the max number of files limit to %d (%s), setting the max clients configuration to %d.",
(int) maxfiles, strerror(errno), (int) server.maxclients);
} else {
server.current_client = NULL;
server.clients = listCreate();
+ server.clients_to_close = listCreate();
server.slaves = listCreate();
server.monitors = listCreate();
server.unblocked_clients = listCreate();
server.stat_peak_memory = 0;
server.stat_fork_time = 0;
server.stat_rejected_conn = 0;
+ memset(server.ops_sec_samples,0,sizeof(server.ops_sec_samples));
+ server.ops_sec_idx = 0;
+ server.ops_sec_last_sample_time = mstime();
+ server.ops_sec_last_sample_ops = 0;
server.unixtime = time(NULL);
+ server.lastbgsave_status = REDIS_OK;
+ server.stop_writes_on_bgsave_err = 1;
aeCreateTimeEvent(server.el, 1, serverCron, NULL, NULL);
if (server.ipfd > 0 && aeCreateFileEvent(server.el,server.ipfd,AE_READABLE,
acceptTcpHandler,NULL) == AE_ERR) oom("creating file event");
}
}
- if (server.cluster_enabled) clusterInit();
+ /* 32 bit instances are limited to 4GB of address space, so if there is
+ * no explicit limit in the user provided configuration we set a limit
+ * at 3.5GB using maxmemory with 'noeviction' policy'. This saves
+ * useless crashes of the Redis instance. */
+ if (server.arch_bits == 32 && server.maxmemory == 0) {
+ redisLog(REDIS_WARNING,"Warning: 32 bit instance detected but no memory limit set. Setting 3.5 GB maxmemory limit with 'noeviction' policy now.");
+ server.maxmemory = 3584LL*(1024*1024); /* 3584 MB = 3.5 GB */
+ server.maxmemory_policy = REDIS_MAXMEMORY_NO_EVICTION;
+ }
+
scriptingInit();
slowlogInit();
bioInit();
case 'f': c->flags |= REDIS_CMD_FORCE_REPLICATION; break;
case 's': c->flags |= REDIS_CMD_NOSCRIPT; break;
case 'R': c->flags |= REDIS_CMD_RANDOM; break;
+ case 'S': c->flags |= REDIS_CMD_SORT_FOR_SCRIPT; break;
default: redisPanic("Unsupported command flag"); break;
}
f++;
}
}
+/* ========================== Redis OP Array API ============================ */
+
+void redisOpArrayInit(redisOpArray *oa) {
+ oa->ops = NULL;
+ oa->numops = 0;
+}
+
+int redisOpArrayAppend(redisOpArray *oa, struct redisCommand *cmd, int dbid,
+ robj **argv, int argc, int target)
+{
+ redisOp *op;
+
+ oa->ops = zrealloc(oa->ops,sizeof(redisOp)*(oa->numops+1));
+ op = oa->ops+oa->numops;
+ op->cmd = cmd;
+ op->dbid = dbid;
+ op->argv = argv;
+ op->argc = argc;
+ op->target = target;
+ oa->numops++;
+ return oa->numops;
+}
+
+void redisOpArrayFree(redisOpArray *oa) {
+ while(oa->numops) {
+ int j;
+ redisOp *op;
+
+ oa->numops--;
+ op = oa->ops+oa->numops;
+ for (j = 0; j < op->argc; j++)
+ decrRefCount(op->argv[j]);
+ zfree(op->argv);
+ }
+ zfree(oa->ops);
+}
+
/* ====================== Commands lookup and execution ===================== */
struct redisCommand *lookupCommand(sds name) {
return cmd;
}
+/* Propagate the specified command (in the context of the specified database id)
+ * to AOF, Slaves and Monitors.
+ *
+ * flags are an xor between:
+ * + REDIS_PROPAGATE_NONE (no propagation of command at all)
+ * + REDIS_PROPAGATE_AOF (propagate into the AOF file if is enabled)
+ * + REDIS_PROPAGATE_REPL (propagate into the replication link)
+ */
+void propagate(struct redisCommand *cmd, int dbid, robj **argv, int argc,
+ int flags)
+{
+ if (server.aof_state != REDIS_AOF_OFF && flags & REDIS_PROPAGATE_AOF)
+ feedAppendOnlyFile(cmd,dbid,argv,argc);
+ if (flags & REDIS_PROPAGATE_REPL && listLength(server.slaves))
+ replicationFeedSlaves(server.slaves,dbid,argv,argc);
+}
+
+/* Used inside commands to schedule the propagation of additional commands
+ * after the current command is propagated to AOF / Replication. */
+void alsoPropagate(struct redisCommand *cmd, int dbid, robj **argv, int argc,
+ int target)
+{
+ redisOpArrayAppend(&server.also_propagate,cmd,dbid,argv,argc,target);
+}
+
/* Call() is the core of Redis execution of a command */
-void call(redisClient *c) {
+void call(redisClient *c, int flags) {
long long dirty, start = ustime(), duration;
+ /* Sent the command to clients in MONITOR mode, only if the commands are
+ * not geneated from reading an AOF. */
+ if (listLength(server.monitors) && !server.loading)
+ replicationFeedMonitors(c,server.monitors,c->db->id,c->argv,c->argc);
+
+ /* Call the command. */
+ redisOpArrayInit(&server.also_propagate);
dirty = server.dirty;
c->cmd->proc(c);
dirty = server.dirty-dirty;
duration = ustime()-start;
- c->cmd->microseconds += duration;
- slowlogPushEntryIfNeeded(c->argv,c->argc,duration);
- c->cmd->calls++;
-
- if (server.aof_state != REDIS_AOF_OFF && dirty > 0)
- feedAppendOnlyFile(c->cmd,c->db->id,c->argv,c->argc);
- if ((dirty > 0 || c->cmd->flags & REDIS_CMD_FORCE_REPLICATION) &&
- listLength(server.slaves))
- replicationFeedSlaves(server.slaves,c->db->id,c->argv,c->argc);
- if (listLength(server.monitors))
- replicationFeedMonitors(server.monitors,c->db->id,c->argv,c->argc);
+
+ /* When EVAL is called loading the AOF we don't want commands called
+ * from Lua to go into the slowlog or to populate statistics. */
+ if (server.loading && c->flags & REDIS_LUA_CLIENT)
+ flags &= ~(REDIS_CALL_SLOWLOG | REDIS_CALL_STATS);
+
+ /* Log the command into the Slow log if needed, and populate the
+ * per-command statistics that we show in INFO commandstats. */
+ if (flags & REDIS_CALL_SLOWLOG)
+ slowlogPushEntryIfNeeded(c->argv,c->argc,duration);
+ if (flags & REDIS_CALL_STATS) {
+ c->cmd->microseconds += duration;
+ c->cmd->calls++;
+ }
+
+ /* Propagate the command into the AOF and replication link */
+ if (flags & REDIS_CALL_PROPAGATE) {
+ int flags = REDIS_PROPAGATE_NONE;
+
+ if (c->cmd->flags & REDIS_CMD_FORCE_REPLICATION)
+ flags |= REDIS_PROPAGATE_REPL;
+ if (dirty)
+ flags |= (REDIS_PROPAGATE_REPL | REDIS_PROPAGATE_AOF);
+ if (flags != REDIS_PROPAGATE_NONE)
+ propagate(c->cmd,c->db->id,c->argv,c->argc,flags);
+ }
+ /* Commands such as LPUSH or BRPOPLPUSH may propagate an additional
+ * PUSH command. */
+ if (server.also_propagate.numops) {
+ int j;
+ redisOp *rop;
+
+ for (j = 0; j < server.also_propagate.numops; j++) {
+ rop = &server.also_propagate.ops[j];
+ propagate(rop->cmd, rop->dbid, rop->argv, rop->argc, rop->target);
+ }
+ redisOpArrayFree(&server.also_propagate);
+ }
server.stat_numcommands++;
}
return REDIS_OK;
}
- /* If cluster is enabled, redirect here */
- if (server.cluster_enabled &&
- !(c->cmd->getkeys_proc == NULL && c->cmd->firstkey == 0)) {
- int hashslot;
-
- if (server.cluster.state != REDIS_CLUSTER_OK) {
- addReplyError(c,"The cluster is down. Check with CLUSTER INFO for more information");
- return REDIS_OK;
- } else {
- int ask;
- clusterNode *n = getNodeByQuery(c,c->cmd,c->argv,c->argc,&hashslot,&ask);
- if (n == NULL) {
- addReplyError(c,"Multi keys request invalid in cluster");
- return REDIS_OK;
- } else if (n != server.cluster.myself) {
- addReplySds(c,sdscatprintf(sdsempty(),
- "-%s %d %s:%d\r\n", ask ? "ASK" : "MOVED",
- hashslot,n->ip,n->port));
- return REDIS_OK;
- }
- }
- }
-
/* Handle the maxmemory directive.
*
* First we try to free some memory if possible (if there are volatile
* keys in the dataset). If there are not the only thing we can do
* is returning an error. */
- if (server.maxmemory) freeMemoryIfNeeded();
- if (server.maxmemory && (c->cmd->flags & REDIS_CMD_DENYOOM) &&
- zmalloc_used_memory() > server.maxmemory)
+ if (server.maxmemory) {
+ int retval = freeMemoryIfNeeded();
+ if ((c->cmd->flags & REDIS_CMD_DENYOOM) && retval == REDIS_ERR) {
+ addReply(c, shared.oomerr);
+ return REDIS_OK;
+ }
+ }
+
+ /* Don't accept write commands if there are problems persisting on disk. */
+ if (server.stop_writes_on_bgsave_err &&
+ server.saveparamslen > 0
+ && server.lastbgsave_status == REDIS_ERR &&
+ c->cmd->flags & REDIS_CMD_WRITE)
{
- addReplyError(c,"command not allowed when used memory > 'maxmemory'");
+ addReply(c, shared.bgsaveerr);
+ return REDIS_OK;
+ }
+
+ /* Don't accept wirte commands if this is a read only slave. But
+ * accept write commands if this is our master. */
+ if (server.masterhost && server.repl_slave_ro &&
+ !(c->flags & REDIS_MASTER) &&
+ c->cmd->flags & REDIS_CMD_WRITE)
+ {
+ addReply(c, shared.roslaveerr);
return REDIS_OK;
}
server.repl_serve_stale_data == 0 &&
c->cmd->proc != infoCommand && c->cmd->proc != slaveofCommand)
{
- addReplyError(c,
- "link with MASTER is down and slave-serve-stale-data is set to no");
+ addReply(c, shared.masterdownerr);
return REDIS_OK;
}
/* Lua script too slow? Only allow SHUTDOWN NOSAVE and SCRIPT KILL. */
if (server.lua_timedout &&
- !(c->cmd->proc != shutdownCommand &&
+ !(c->cmd->proc == shutdownCommand &&
c->argc == 2 &&
tolower(((char*)c->argv[1]->ptr)[0]) == 'n') &&
!(c->cmd->proc == scriptCommand &&
queueMultiCommand(c);
addReply(c,shared.queued);
} else {
- call(c);
+ call(c,REDIS_CALL_FULL);
}
return REDIS_OK;
}
addReplyBulk(c,c->argv[1]);
}
+void timeCommand(redisClient *c) {
+ struct timeval tv;
+
+ /* gettimeofday() can only fail if &tv is a bad addresss so we
+ * don't check for errors. */
+ gettimeofday(&tv,NULL);
+ addReplyMultiBulkLen(c,2);
+ addReplyBulkLongLong(c,tv.tv_sec);
+ addReplyBulkLongLong(c,tv.tv_usec);
+}
+
/* Convert an amount of bytes into a human readable string in the form
* of 100B, 2G, 100M, 4K, and so forth. */
void bytesToHuman(char *s, unsigned long long n) {
* on memory corruption problems. */
sds genRedisInfoString(char *section) {
sds info = sdsempty();
- time_t uptime = time(NULL)-server.stat_starttime;
+ time_t uptime = server.unixtime-server.stat_starttime;
int j, numcommands;
struct rusage self_ru, c_ru;
unsigned long lol, bib;
/* Server */
if (allsections || defsections || !strcasecmp(section,"server")) {
+ struct utsname name;
+
if (sections++) info = sdscat(info,"\r\n");
+ uname(&name);
info = sdscatprintf(info,
"# Server\r\n"
"redis_version:%s\r\n"
"redis_git_sha1:%s\r\n"
"redis_git_dirty:%d\r\n"
- "arch_bits:%s\r\n"
+ "os:%s %s %s\r\n"
+ "arch_bits:%d\r\n"
"multiplexing_api:%s\r\n"
"gcc_version:%d.%d.%d\r\n"
"process_id:%ld\r\n"
+ "run_id:%s\r\n"
"tcp_port:%d\r\n"
"uptime_in_seconds:%ld\r\n"
"uptime_in_days:%ld\r\n"
REDIS_VERSION,
redisGitSHA1(),
strtol(redisGitDirty(),NULL,10) > 0,
- (sizeof(long) == 8) ? "64" : "32",
+ name.sysname, name.release, name.machine,
+ server.arch_bits,
aeGetApiName(),
#ifdef __GNUC__
__GNUC__,__GNUC_MINOR__,__GNUC_PATCHLEVEL__,
0,0,0,
#endif
(long) getpid(),
+ server.runid,
server.port,
uptime,
uptime/(3600*24),
if (sections++) info = sdscat(info,"\r\n");
info = sdscatprintf(info,
"# Clients\r\n"
- "connected_clients:%d\r\n"
+ "connected_clients:%lu\r\n"
"client_longest_output_list:%lu\r\n"
"client_biggest_input_buf:%lu\r\n"
"blocked_clients:%d\r\n",
"changes_since_last_save:%lld\r\n"
"bgsave_in_progress:%d\r\n"
"last_save_time:%ld\r\n"
- "bgrewriteaof_in_progress:%d\r\n",
+ "last_bgsave_status:%s\r\n"
+ "bgrewriteaof_in_progress:%d\r\n"
+ "bgrewriteaof_scheduled:%d\r\n",
server.loading,
server.aof_state != REDIS_AOF_OFF,
server.dirty,
server.rdb_child_pid != -1,
server.lastsave,
- server.aof_child_pid != -1);
+ server.lastbgsave_status == REDIS_OK ? "ok" : "err",
+ server.aof_child_pid != -1,
+ server.aof_rewrite_scheduled);
if (server.aof_state != REDIS_AOF_OFF) {
info = sdscatprintf(info,
"aof_base_size:%lld\r\n"
"aof_pending_rewrite:%d\r\n"
"aof_buffer_length:%zu\r\n"
- "aof_pending_bio_fsync:%llu\r\n",
+ "aof_pending_bio_fsync:%llu\r\n"
+ "aof_delayed_fsync:%lu\r\n",
(long long) server.aof_current_size,
(long long) server.aof_rewrite_base_size,
server.aof_rewrite_scheduled,
sdslen(server.aof_buf),
- bioPendingJobsOfType(REDIS_BIO_AOF_FSYNC));
+ bioPendingJobsOfType(REDIS_BIO_AOF_FSYNC),
+ server.aof_delayed_fsync);
}
if (server.loading) {
perc = ((double)server.loading_loaded_bytes /
server.loading_total_bytes) * 100;
- elapsed = time(NULL)-server.loading_start_time;
+ elapsed = server.unixtime-server.loading_start_time;
if (elapsed == 0) {
eta = 1; /* A fake 1 second figure if we don't have
enough info */
"# Stats\r\n"
"total_connections_received:%lld\r\n"
"total_commands_processed:%lld\r\n"
+ "instantaneous_ops_per_sec:%lld\r\n"
"rejected_connections:%lld\r\n"
"expired_keys:%lld\r\n"
"evicted_keys:%lld\r\n"
"keyspace_hits:%lld\r\n"
"keyspace_misses:%lld\r\n"
"pubsub_channels:%ld\r\n"
- "pubsub_patterns:%u\r\n"
+ "pubsub_patterns:%lu\r\n"
"latest_fork_usec:%lld\r\n",
server.stat_numconnections,
server.stat_numcommands,
+ getOperationsPerSecond(),
server.stat_rejected_conn,
server.stat_expiredkeys,
server.stat_evictedkeys,
(server.repl_state == REDIS_REPL_CONNECTED) ?
"up" : "down",
server.master ?
- ((int)(time(NULL)-server.master->lastinteraction)) : -1,
+ ((int)(server.unixtime-server.master->lastinteraction)) : -1,
server.repl_state == REDIS_REPL_TRANSFER
);
"master_sync_left_bytes:%ld\r\n"
"master_sync_last_io_seconds_ago:%d\r\n"
,(long)server.repl_transfer_left,
- (int)(time(NULL)-server.repl_transfer_lastio)
+ (int)(server.unixtime-server.repl_transfer_lastio)
);
}
if (server.repl_state != REDIS_REPL_CONNECTED) {
info = sdscatprintf(info,
"master_link_down_since_seconds:%ld\r\n",
- (long)time(NULL)-server.repl_down_since);
+ (long)server.unixtime-server.repl_down_since);
}
}
info = sdscatprintf(info,
- "connected_slaves:%d\r\n",
+ "connected_slaves:%lu\r\n",
listLength(server.slaves));
if (listLength(server.slaves)) {
int slaveid = 0;
}
}
- /* Clusetr */
- if (allsections || defsections || !strcasecmp(section,"cluster")) {
- if (sections++) info = sdscat(info,"\r\n");
- info = sdscatprintf(info,
- "# Cluster\r\n"
- "cluster_enabled:%d\r\n",
- server.cluster_enabled);
- }
-
/* Key space */
if (allsections || defsections || !strcasecmp(section,"keyspace")) {
if (sections++) info = sdscat(info,"\r\n");
/* ============================ Maxmemory directive ======================== */
/* This function gets called when 'maxmemory' is set on the config file to limit
- * the max memory used by the server, and we are out of memory.
- * This function will try to, in order:
+ * the max memory used by the server, before processing a command.
*
- * - Free objects from the free list
- * - Try to remove keys with an EXPIRE set
+ * The goal of the function is to free enough memory to keep Redis under the
+ * configured memory limit.
*
- * It is not possible to free enough memory to reach used-memory < maxmemory
- * the server will start refusing commands that will enlarge even more the
- * memory usage.
+ * The function starts calculating how many bytes should be freed to keep
+ * Redis under the limit, and enters a loop selecting the best keys to
+ * evict accordingly to the configured policy.
+ *
+ * If all the bytes needed to return back under the limit were freed the
+ * function returns REDIS_OK, otherwise REDIS_ERR is returned, and the caller
+ * should block the execution of commands that will result in more memory
+ * used by the server.
*/
-void freeMemoryIfNeeded(void) {
- /* Remove keys accordingly to the active policy as long as we are
- * over the memory limit. */
- if (server.maxmemory_policy == REDIS_MAXMEMORY_NO_EVICTION) return;
+int freeMemoryIfNeeded(void) {
+ size_t mem_used, mem_tofree, mem_freed;
+ int slaves = listLength(server.slaves);
+
+ /* Remove the size of slaves output buffers and AOF buffer from the
+ * count of used memory. */
+ mem_used = zmalloc_used_memory();
+ if (slaves) {
+ listIter li;
+ listNode *ln;
+
+ listRewind(server.slaves,&li);
+ while((ln = listNext(&li))) {
+ redisClient *slave = listNodeValue(ln);
+ unsigned long obuf_bytes = getClientOutputBufferMemoryUsage(slave);
+ if (obuf_bytes > mem_used)
+ mem_used = 0;
+ else
+ mem_used -= obuf_bytes;
+ }
+ }
+ if (server.aof_state != REDIS_AOF_OFF) {
+ mem_used -= sdslen(server.aof_buf);
+ mem_used -= sdslen(server.aof_rewrite_buf);
+ }
- while (server.maxmemory && zmalloc_used_memory() > server.maxmemory) {
- int j, k, freed = 0;
+ /* Check if we are over the memory limit. */
+ if (mem_used <= server.maxmemory) return REDIS_OK;
+
+ if (server.maxmemory_policy == REDIS_MAXMEMORY_NO_EVICTION)
+ return REDIS_ERR; /* We need to free memory, but policy forbids. */
+
+ /* Compute how much memory we need to free. */
+ mem_tofree = mem_used - server.maxmemory;
+ mem_freed = 0;
+ while (mem_freed < mem_tofree) {
+ int j, k, keys_freed = 0;
for (j = 0; j < server.dbnum; j++) {
long bestval = 0; /* just to prevent warning */
/* Finally remove the selected key. */
if (bestkey) {
+ long long delta;
+
robj *keyobj = createStringObject(bestkey,sdslen(bestkey));
propagateExpire(db,keyobj);
+ /* We compute the amount of memory freed by dbDelete() alone.
+ * It is possible that actually the memory needed to propagate
+ * the DEL in AOF and replication link is greater than the one
+ * we are freeing removing the key, but we can't account for
+ * that otherwise we would never exit the loop.
+ *
+ * AOF and Output buffer memory will be freed eventually so
+ * we only care about memory used by the key space. */
+ delta = (long long) zmalloc_used_memory();
dbDelete(db,keyobj);
+ delta -= (long long) zmalloc_used_memory();
+ mem_freed += delta;
server.stat_evictedkeys++;
decrRefCount(keyobj);
- freed++;
+ keys_freed++;
+
+ /* When the memory to free starts to be big enough, we may
+ * start spending so much time here that is impossible to
+ * deliver data to the slaves fast enough, so we force the
+ * transmission here inside the loop. */
+ if (slaves) flushSlavesOutputBuffers();
}
}
- if (!freed) return; /* nothing to free... */
+ if (!keys_freed) return REDIS_ERR; /* nothing to free... */
}
+ return REDIS_OK;
}
/* =================================== Main! ================================ */
}
void version() {
- printf("Redis server version %s (%s:%d)\n", REDIS_VERSION,
- redisGitSHA1(), atoi(redisGitDirty()) > 0);
+ printf("Redis server v=%s sha=%s:%d malloc=%s bits=%d\n",
+ REDIS_VERSION,
+ redisGitSHA1(),
+ atoi(redisGitDirty()) > 0,
+ ZMALLOC_LIB,
+ sizeof(long) == 4 ? 32 : 64);
exit(0);
}
fprintf(stderr,"Usage: ./redis-server [/path/to/redis.conf] [options]\n");
fprintf(stderr," ./redis-server - (read config from stdin)\n");
fprintf(stderr," ./redis-server -v or --version\n");
- fprintf(stderr," ./redis-server -h or --help\n\n");
+ fprintf(stderr," ./redis-server -h or --help\n");
+ fprintf(stderr," ./redis-server --test-memory <megabytes>\n\n");
fprintf(stderr,"Examples:\n");
fprintf(stderr," ./redis-server (run the server with default conf)\n");
fprintf(stderr," ./redis-server /etc/redis/6379.conf\n");
redisGitSHA1(),
strtol(redisGitDirty(),NULL,10) > 0,
(sizeof(long) == 8) ? "64" : "32",
- server.cluster_enabled ? "cluster" : "stand alone",
+ "stand alone",
server.port,
(long) getpid()
);
static void sigtermHandler(int sig) {
REDIS_NOTUSED(sig);
- redisLog(REDIS_WARNING,"Received SIGTERM, scheduling shutdown...");
+ redisLogFromHandler(REDIS_WARNING,"Received SIGTERM, scheduling shutdown...");
server.shutdown_asap = 1;
}
/* When the SA_SIGINFO flag is set in sa_flags then sa_sigaction is used.
* Otherwise, sa_handler is used. */
sigemptyset(&act.sa_mask);
- act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND;
+ act.sa_flags = 0;
act.sa_handler = sigtermHandler;
sigaction(SIGTERM, &act, NULL);
#ifdef HAVE_BACKTRACE
sigemptyset(&act.sa_mask);
- act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
+ act.sa_flags = SA_NODEFER | SA_RESETHAND | SA_SIGINFO;
act.sa_sigaction = sigsegvHandler;
sigaction(SIGSEGV, &act, NULL);
sigaction(SIGBUS, &act, NULL);
return;
}
+void memtest(size_t megabytes, int passes);
+
int main(int argc, char **argv) {
long long start;
struct timeval tv;
strcmp(argv[1], "--version") == 0) version();
if (strcmp(argv[1], "--help") == 0 ||
strcmp(argv[1], "-h") == 0) usage();
+ if (strcmp(argv[1], "--test-memory") == 0) {
+ if (argc == 3) {
+ memtest(atoi(argv[2]),50);
+ exit(0);
+ } else {
+ fprintf(stderr,"Please specify the amount of memory to test in megabytes.\n");
+ fprintf(stderr,"Example: ./redis-server --test-memory 4096\n\n");
+ exit(1);
+ }
+ }
+
/* First argument is the config file name? */
if (argv[j][0] != '-' || argv[j][1] != '-')
configfile = argv[j++];
projects / redis.git / blobdiff