By default Redis refuses writes with an error if the latest BGSAVE failed (and at...

[redis.git] / src / redis.c

diff --git a/src/redis.c b/src/redis.c
index 6d5522e824c93b0ada93e823f7a3d80a174ff943..01ec0531ef15711d512b43a08e224d06a9f9b59d 100644 (file)
--- a/src/redis.c
+++ b/src/redis.c
@@ -833,6 +833,8 @@ void createSharedObjects(void) {
         "-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.bgsaveerr = createObject(REDIS_STRING,sdsnew(
+        "-MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Write commands are disabled. Please check Redis logs for details about the error.\r\n"));
     shared.space = createObject(REDIS_STRING,sdsnew(" "));
     shared.colon = createObject(REDIS_STRING,sdsnew(":"));
     shared.plus = createObject(REDIS_STRING,sdsnew("+"));
@@ -1088,6 +1090,8 @@ void initServer() {
     server.stat_fork_time = 0;
     server.stat_rejected_conn = 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");
@@ -1374,6 +1378,16 @@ int processCommand(redisClient *c) {
         }
     }
 
+    /* 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)
+    {
+        addReply(c, shared.bgsaveerr);
+        return REDIS_OK;
+    }
+
     /* Only allow SUBSCRIBE and UNSUBSCRIBE in the context of Pub/Sub */
     if ((dictSize(c->pubsub_channels) > 0 || listLength(c->pubsub_patterns) > 0)
         &&
@@ -1645,12 +1659,14 @@ sds genRedisInfoString(char *section) {
             "changes_since_last_save:%lld\r\n"
             "bgsave_in_progress:%d\r\n"
             "last_save_time:%ld\r\n"
+            "last_bgsave_status:%s\r\n"
             "bgrewriteaof_in_progress:%d\r\n",
             server.loading,
             server.aof_state != REDIS_AOF_OFF,
             server.dirty,
             server.rdb_child_pid != -1,
             server.lastsave,
+            server.lastbgsave_status == REDIS_OK ? "ok" : "err",
             server.aof_child_pid != -1);
 
         if (server.aof_state != REDIS_AOF_OFF) {