X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/1b1f47c915c69eae40d99727267b147f7c5a44ac..3b5e72d402345507856b00bb67a91942f4f1a49d:/src/redis.c

diff --git a/src/redis.c b/src/redis.c
index d099551e..8519f46f 100644
--- a/src/redis.c
+++ b/src/redis.c
@@ -616,10 +616,7 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
         while (server.vm_enabled && zmalloc_used_memory() >
                 server.vm_max_memory)
         {
-            int retval;
-
-            if (tryFreeOneObjectFromFreelist() == REDIS_OK) continue;
-            retval = (server.vm_max_threads == 0) ?
+            int retval = (server.vm_max_threads == 0) ?
                         vmSwapOneObjectBlocking() :
                         vmSwapOneObjectThreaded();
             if (retval == REDIS_ERR && !(loops % 300) &&
@@ -636,14 +633,10 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
         }
     }
 
-    /* Check if we should connect to a MASTER */
-    if (server.replstate == REDIS_REPL_CONNECT && !(loops % 10)) {
-        redisLog(REDIS_NOTICE,"Connecting to MASTER...");
-        if (syncWithMaster() == REDIS_OK) {
-            redisLog(REDIS_NOTICE,"MASTER <-> SLAVE sync succeeded");
-            if (server.appendonly) rewriteAppendOnlyFileBackground();
-        }
-    }
+    /* Replication cron function -- used to reconnect to master and
+     * to detect transfer failures. */
+    if (!(loops % 10)) replicationCron();
+
     return 100;
 }
 
@@ -793,12 +786,21 @@ void initServerConfig() {
     server.masterport = 6379;
     server.master = NULL;
     server.replstate = REDIS_REPL_NONE;
+    server.repl_serve_stale_data = 1;
 
     /* Double constants initialization */
     R_Zero = 0.0;
     R_PosInf = 1.0/R_Zero;
     R_NegInf = -1.0/R_Zero;
     R_Nan = R_Zero/R_Zero;
+
+    /* Command table -- we intiialize it here as it is part of the
+     * initial configuration, since command names may be changed via
+     * redis.conf using the rename-command directive. */
+    server.commands = dictCreate(&commandTableDictType,NULL);
+    populateCommandTable();
+    server.delCommand = lookupCommandByCString("del");
+    server.multiCommand = lookupCommandByCString("multi");
 }
 
 void initServer() {
@@ -814,16 +816,9 @@ void initServer() {
         redisLog(REDIS_WARNING, "Can't open /dev/null: %s", server.neterr);
         exit(1);
     }
-
-    server.commands = dictCreate(&commandTableDictType,NULL);
-    populateCommandTable();
-    server.delCommand = lookupCommandByCString("del");
-    server.multiCommand = lookupCommandByCString("multi");
-
     server.clients = listCreate();
     server.slaves = listCreate();
     server.monitors = listCreate();
-    server.objfreelist = listCreate();
     createSharedObjects();
     server.el = aeCreateEventLoop();
     server.db = zmalloc(sizeof(redisDb)*server.dbnum);
@@ -1000,6 +995,17 @@ int processCommand(redisClient *c) {
         return REDIS_OK;
     }
 
+    /* Only allow INFO and SLAVEOF when slave-serve-stale-data is no and
+     * we are a slave with a broken link with master. */
+    if (server.masterhost && server.replstate != REDIS_REPL_CONNECTED &&
+        server.repl_serve_stale_data == 0 &&
+        cmd->proc != infoCommand && cmd->proc != slaveofCommand)
+    {
+        addReplyError(c,
+            "link with MASTER is down and slave-serve-stale-data is set to no");
+        return REDIS_OK;
+    }
+
     /* Exec the command */
     if (c->flags & REDIS_MULTI &&
         cmd->proc != execCommand && cmd->proc != discardCommand &&
@@ -1189,12 +1195,23 @@ sds genRedisInfoString(void) {
             "master_port:%d\r\n"
             "master_link_status:%s\r\n"
             "master_last_io_seconds_ago:%d\r\n"
+            "master_sync_in_progress:%d\r\n"
             ,server.masterhost,
             server.masterport,
             (server.replstate == REDIS_REPL_CONNECTED) ?
                 "up" : "down",
-            server.master ? ((int)(time(NULL)-server.master->lastinteraction)) : -1
+            server.master ? ((int)(time(NULL)-server.master->lastinteraction)) : -1,
+            server.replstate == REDIS_REPL_TRANSFER
         );
+
+        if (server.replstate == REDIS_REPL_TRANSFER) {
+            info = sdscatprintf(info,
+                "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)
+            );
+        }
     }
     if (server.vm_enabled) {
         lockThreadedIO();
@@ -1259,27 +1276,6 @@ void monitorCommand(redisClient *c) {
 
 /* ============================ Maxmemory directive  ======================== */
 
-/* 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. */
-int tryFreeOneObjectFromFreelist(void) {
-    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);
-        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
  * the max memory used by the server, and we are out of memory.
  * This function will try to, in order:
@@ -1297,9 +1293,6 @@ void freeMemoryIfNeeded(void) {
     while (server.maxmemory && zmalloc_used_memory() > server.maxmemory) {
         int j, k, freed = 0;
 
-        /* Basic strategy -- remove objects from the free list. */
-        if (tryFreeOneObjectFromFreelist() == REDIS_OK) continue;
-
         for (j = 0; j < server.dbnum; j++) {
             long bestval = 0; /* just to prevent warning */
             sds bestkey = NULL;