* 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},
{"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},
shared.unsubscribebulk = createStringObject("$11\r\nunsubscribe\r\n",18);
shared.psubscribebulk = createStringObject("$10\r\npsubscribe\r\n",17);
shared.punsubscribebulk = createStringObject("$12\r\npunsubscribe\r\n",19);
- shared.mbulk3 = createStringObject("*3\r\n",4);
- shared.mbulk4 = createStringObject("*4\r\n",4);
+ shared.del = createStringObject("DEL",3);
for (j = 0; j < REDIS_SHARED_INTEGERS; j++) {
shared.integers[j] = createObject(REDIS_STRING,(void*)(long)j);
shared.integers[j]->encoding = REDIS_ENCODING_INT;
}
+ for (j = 0; j < REDIS_SHARED_BULKHDR_LEN; j++) {
+ shared.mbulkhdr[j] = createObject(REDIS_STRING,
+ sdscatprintf(sdsempty(),"*%d\r\n",j));
+ shared.bulkhdr[j] = createObject(REDIS_STRING,
+ sdscatprintf(sdsempty(),"$%d\r\n",j));
+ }
}
void initServerConfig() {
+ server.arch_bits = (sizeof(long) == 8) ? 64 : 32;
server.port = REDIS_SERVERPORT;
server.bindaddr = NULL;
server.unixsocket = NULL;
}
}
+ /* 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;
+ }
+
if (server.cluster_enabled) clusterInit();
scriptingInit();
slowlogInit();
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++;
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);
+}
+
/* 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(server.monitors,c->db->id,c->argv,c->argc);
+
+ /* Call the command. */
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);
+ }
server.stat_numcommands++;
}
* 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)
- {
- addReplyError(c,"command not allowed when used memory > 'maxmemory'");
- return REDIS_OK;
+ if (server.maxmemory) {
+ int retval = freeMemoryIfNeeded();
+ if ((c->cmd->flags & REDIS_CMD_DENYOOM) && retval == REDIS_ERR) {
+ addReplyError(c,
+ "command not allowed when used memory > 'maxmemory'");
+ return REDIS_OK;
+ }
}
/* Only allow SUBSCRIBE and UNSUBSCRIBE in the context of Pub/Sub */
queueMultiCommand(c);
addReply(c,shared.queued);
} else {
- call(c);
+ call(c,REDIS_CALL_FULL);
}
return REDIS_OK;
}
"redis_version:%s\r\n"
"redis_git_sha1:%s\r\n"
"redis_git_dirty:%d\r\n"
- "arch_bits:%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"
REDIS_VERSION,
redisGitSHA1(),
strtol(redisGitDirty(),NULL,10) > 0,
- (sizeof(long) == 8) ? "64" : "32",
+ server.arch_bits,
aeGetApiName(),
#ifdef __GNUC__
__GNUC__,__GNUC_MINOR__,__GNUC_PATCHLEVEL__,
/* ============================ 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.
+ *
+ * The goal of the function is to free enough memory to keep Redis under the
+ * configured memory limit.
*
- * - Free objects from the free list
- * - Try to remove keys with an EXPIRE set
+ * 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.
*
- * 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.
+ * 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);
+ }
+
+ /* 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. */
- while (server.maxmemory && zmalloc_used_memory() > server.maxmemory) {
- int j, k, freed = 0;
+ /* 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! ================================ */
projects / redis.git / blobdiff