void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc) {
listNode *ln;
listIter li;
- int outc = 0, j;
- robj **outv;
- /* We need 1+(ARGS*3) objects since commands are using the new protocol
- * and we one 1 object for the first "*<count>\r\n" multibulk count, then
- * for every additional object we have "$<count>\r\n" + object + "\r\n". */
- robj *static_outv[REDIS_STATIC_ARGS*3+1];
- robj *lenobj;
-
- if (argc <= REDIS_STATIC_ARGS) {
- outv = static_outv;
- } else {
- outv = zmalloc(sizeof(robj*)*(argc*3+1));
- }
-
- lenobj = createObject(REDIS_STRING,
- sdscatprintf(sdsempty(), "*%d\r\n", argc));
- lenobj->refcount = 0;
- outv[outc++] = lenobj;
- for (j = 0; j < argc; j++) {
- lenobj = createObject(REDIS_STRING,
- sdscatprintf(sdsempty(),"$%lu\r\n",
- (unsigned long) stringObjectLen(argv[j])));
- lenobj->refcount = 0;
- outv[outc++] = lenobj;
- outv[outc++] = argv[j];
- outv[outc++] = shared.crlf;
- }
+ int j;
- /* Increment all the refcounts at start and decrement at end in order to
- * 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,&li);
while((ln = listNext(&li))) {
redisClient *slave = ln->value;
/* Don't feed slaves that are still waiting for BGSAVE to start */
if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_START) continue;
- /* Feed all the other slaves, MONITORs and so on */
+ /* Feed slaves that are waiting for the initial SYNC (so these commands
+ * are queued in the output buffer until the intial SYNC completes),
+ * or are already in sync with the master. */
if (slave->slaveseldb != dictid) {
robj *selectcmd;
addReply(slave,selectcmd);
slave->slaveseldb = dictid;
}
- for (j = 0; j < outc; j++) addReply(slave,outv[j]);
+ addReplyMultiBulkLen(slave,argc);
+ for (j = 0; j < argc; j++) addReplyBulk(slave,argv[j]);
}
- for (j = 0; j < outc; j++) decrRefCount(outv[j]);
- if (outv != static_outv) zfree(outv);
}
void replicationFeedMonitors(list *monitors, int dictid, robj **argv, int argc) {
/* Refuse SYNC requests if we are a slave but the link with our master
* is not ok... */
- if (server.masterhost && server.replstate != REDIS_REPL_CONNECTED) {
+ if (server.masterhost && server.repl_state != REDIS_REPL_CONNECTED) {
addReplyError(c,"Can't SYNC while not connected with my master");
return;
}
redisLog(REDIS_NOTICE,"Slave ask for synchronization");
/* Here we need to check if there is a background saving operation
* in progress, or if it is required to start one */
- if (server.bgsavechildpid != -1) {
+ if (server.rdb_child_pid != -1) {
/* Ok a background save is in progress. Let's check if it is a good
* one for replication, i.e. if there is another slave that is
* registering differences since the server forked to save */
if (ln) {
/* Perfect, the server is already registering differences for
* another slave. Set the right state, and copy the buffer. */
- listRelease(c->reply);
- c->reply = listDup(slave->reply);
+ copyClientOutputBuffer(c,slave);
c->replstate = REDIS_REPL_WAIT_BGSAVE_END;
redisLog(REDIS_NOTICE,"Waiting for end of BGSAVE for SYNC");
} else {
} else {
/* Ok we don't have a BGSAVE in progress, let's start one */
redisLog(REDIS_NOTICE,"Starting BGSAVE for SYNC");
- if (rdbSaveBackground(server.dbfilename) != REDIS_OK) {
+ if (rdbSaveBackground(server.rdb_filename) != REDIS_OK) {
redisLog(REDIS_NOTICE,"Replication failed, can't BGSAVE");
addReplyError(c,"Unable to perform background save");
return;
redisLog(REDIS_WARNING,"SYNC failed. BGSAVE child returned an error");
continue;
}
- if ((slave->repldbfd = open(server.dbfilename,O_RDONLY)) == -1 ||
+ if ((slave->repldbfd = open(server.rdb_filename,O_RDONLY)) == -1 ||
redis_fstat(slave->repldbfd,&buf) == -1) {
freeClient(slave);
redisLog(REDIS_WARNING,"SYNC failed. Can't open/stat DB after BGSAVE: %s", strerror(errno));
}
}
if (startbgsave) {
- if (rdbSaveBackground(server.dbfilename) != REDIS_OK) {
+ if (rdbSaveBackground(server.rdb_filename) != REDIS_OK) {
listIter li;
listRewind(server.slaves,&li);
/* Abort the async download of the bulk dataset while SYNC-ing with master */
void replicationAbortSyncTransfer(void) {
- redisAssert(server.replstate == REDIS_REPL_TRANSFER);
+ redisAssert(server.repl_state == REDIS_REPL_TRANSFER);
aeDeleteFileEvent(server.el,server.repl_transfer_s,AE_READABLE);
close(server.repl_transfer_s);
close(server.repl_transfer_fd);
unlink(server.repl_transfer_tmpfile);
zfree(server.repl_transfer_tmpfile);
- server.replstate = REDIS_REPL_CONNECT;
+ server.repl_state = REDIS_REPL_CONNECT;
}
/* Asynchronously read the SYNC payload we receive from a master */
server.repl_transfer_left -= nread;
/* Check if the transfer is now complete */
if (server.repl_transfer_left == 0) {
- if (rename(server.repl_transfer_tmpfile,server.dbfilename) == -1) {
+ if (rename(server.repl_transfer_tmpfile,server.rdb_filename) == -1) {
redisLog(REDIS_WARNING,"Failed trying to rename the temp DB into dump.rdb in MASTER <-> SLAVE synchronization: %s", strerror(errno));
replicationAbortSyncTransfer();
return;
* rdbLoad() will call the event loop to process events from time to
* time for non blocking loading. */
aeDeleteFileEvent(server.el,server.repl_transfer_s,AE_READABLE);
- if (rdbLoad(server.dbfilename) != REDIS_OK) {
+ if (rdbLoad(server.rdb_filename) != REDIS_OK) {
redisLog(REDIS_WARNING,"Failed trying to load the MASTER synchronization DB from disk");
replicationAbortSyncTransfer();
return;
server.master = createClient(server.repl_transfer_s);
server.master->flags |= REDIS_MASTER;
server.master->authenticated = 1;
- server.replstate = REDIS_REPL_CONNECTED;
+ server.repl_state = REDIS_REPL_CONNECTED;
redisLog(REDIS_NOTICE, "MASTER <-> SLAVE sync: Finished with success");
+ /* Restart the AOF subsystem now that we finished the sync. This
+ * will trigger an AOF rewrite, and when done will start appending
+ * to the new file. */
+ if (server.aof_state != REDIS_AOF_OFF) {
+ int retry = 10;
+
+ stopAppendOnly();
+ while (retry-- && startAppendOnly() == REDIS_ERR) {
+ redisLog(REDIS_WARNING,"Failed enabling the AOF after successful master synchrnization! Trying it again in one second.");
+ sleep(1);
+ }
+ if (!retry) {
+ redisLog(REDIS_WARNING,"FATAL: this slave instance finished the synchronization with its master, but the AOF can't be turned on. Exiting now.");
+ exit(1);
+ }
+ }
}
return;
REDIS_NOTUSED(privdata);
REDIS_NOTUSED(mask);
+ /* If this event fired after the user turned the instance into a master
+ * with SLAVEOF NO ONE we must just return ASAP. */
+ if (server.repl_state == REDIS_REPL_NONE) {
+ close(fd);
+ return;
+ }
+
+ redisLog(REDIS_NOTICE,"Non blocking connect for SYNC fired the event.");
/* This event should only be triggered once since it is used to have a
* non-blocking connect(2) to the master. It has been triggered when this
* function is called, so we can delete it. */
- aeDeleteFileEvent(server.el,fd,AE_WRITABLE);
+ aeDeleteFileEvent(server.el,fd,AE_READABLE|AE_WRITABLE);
/* AUTH with the master if required. */
if(server.masterauth) {
goto error;
}
- server.replstate = REDIS_REPL_TRANSFER;
+ server.repl_state = REDIS_REPL_TRANSFER;
server.repl_transfer_left = -1;
server.repl_transfer_fd = dfd;
server.repl_transfer_lastio = time(NULL);
return;
error:
- server.replstate = REDIS_REPL_CONNECT;
+ server.repl_state = REDIS_REPL_CONNECT;
close(fd);
return;
}
return REDIS_ERR;
}
- if (aeCreateFileEvent(server.el,fd,AE_WRITABLE,syncWithMaster,NULL) ==
+ if (aeCreateFileEvent(server.el,fd,AE_READABLE|AE_WRITABLE,syncWithMaster,NULL) ==
AE_ERR)
{
close(fd);
return REDIS_ERR;
}
+ server.repl_transfer_lastio = time(NULL);
server.repl_transfer_s = fd;
- server.replstate = REDIS_REPL_CONNECTING;
+ server.repl_state = REDIS_REPL_CONNECTING;
return REDIS_OK;
}
+/* This function can be called when a non blocking connection is currently
+ * in progress to undo it. */
+void undoConnectWithMaster(void) {
+ int fd = server.repl_transfer_s;
+
+ redisAssert(server.repl_state == REDIS_REPL_CONNECTING);
+ aeDeleteFileEvent(server.el,fd,AE_READABLE|AE_WRITABLE);
+ close(fd);
+ server.repl_transfer_s = -1;
+ server.repl_state = REDIS_REPL_CONNECT;
+}
+
void slaveofCommand(redisClient *c) {
if (!strcasecmp(c->argv[1]->ptr,"no") &&
!strcasecmp(c->argv[2]->ptr,"one")) {
sdsfree(server.masterhost);
server.masterhost = NULL;
if (server.master) freeClient(server.master);
- if (server.replstate == REDIS_REPL_TRANSFER)
+ if (server.repl_state == REDIS_REPL_TRANSFER)
replicationAbortSyncTransfer();
- server.replstate = REDIS_REPL_NONE;
+ else if (server.repl_state == REDIS_REPL_CONNECTING)
+ undoConnectWithMaster();
+ server.repl_state = REDIS_REPL_NONE;
redisLog(REDIS_NOTICE,"MASTER MODE enabled (user request)");
}
} else {
+ long port;
+
+ if ((getLongFromObjectOrReply(c, c->argv[2], &port, NULL) != REDIS_OK))
+ return;
+
+ /* Check if we are already attached to the specified slave */
+ if (server.masterhost && !strcasecmp(server.masterhost,c->argv[1]->ptr)
+ && server.masterport == port) {
+ redisLog(REDIS_NOTICE,"SLAVE OF would result into synchronization with the master we are already connected with. No operation performed.");
+ addReplySds(c,sdsnew("+OK Already connected to specified master\r\n"));
+ return;
+ }
+ /* There was no previous master or the user specified a different one,
+ * we can continue. */
sdsfree(server.masterhost);
server.masterhost = sdsdup(c->argv[1]->ptr);
- server.masterport = atoi(c->argv[2]->ptr);
+ server.masterport = port;
if (server.master) freeClient(server.master);
- if (server.replstate == REDIS_REPL_TRANSFER)
+ if (server.repl_state == REDIS_REPL_TRANSFER)
replicationAbortSyncTransfer();
- server.replstate = REDIS_REPL_CONNECT;
+ server.repl_state = REDIS_REPL_CONNECT;
redisLog(REDIS_NOTICE,"SLAVE OF %s:%d enabled (user request)",
server.masterhost, server.masterport);
}
/* --------------------------- REPLICATION CRON ---------------------------- */
-#define REDIS_REPL_TIMEOUT 60
-#define REDIS_REPL_PING_SLAVE_PERIOD 10
-
void replicationCron(void) {
+ /* Non blocking connection timeout? */
+ if (server.masterhost && server.repl_state == REDIS_REPL_CONNECTING &&
+ (time(NULL)-server.repl_transfer_lastio) > server.repl_timeout)
+ {
+ redisLog(REDIS_WARNING,"Timeout connecting to the MASTER...");
+ undoConnectWithMaster();
+ }
+
/* Bulk transfer I/O timeout? */
- if (server.masterhost && server.replstate == REDIS_REPL_TRANSFER &&
- (time(NULL)-server.repl_transfer_lastio) > REDIS_REPL_TIMEOUT)
+ if (server.masterhost && server.repl_state == REDIS_REPL_TRANSFER &&
+ (time(NULL)-server.repl_transfer_lastio) > server.repl_timeout)
{
redisLog(REDIS_WARNING,"Timeout receiving bulk data from MASTER...");
replicationAbortSyncTransfer();
}
/* Timed out master when we are an already connected slave? */
- if (server.masterhost && server.replstate == REDIS_REPL_CONNECTED &&
- (time(NULL)-server.master->lastinteraction) > REDIS_REPL_TIMEOUT)
+ if (server.masterhost && server.repl_state == REDIS_REPL_CONNECTED &&
+ (time(NULL)-server.master->lastinteraction) > server.repl_timeout)
{
redisLog(REDIS_WARNING,"MASTER time out: no data nor PING received...");
freeClient(server.master);
}
/* Check if we should connect to a MASTER */
- if (server.replstate == REDIS_REPL_CONNECT) {
+ if (server.repl_state == REDIS_REPL_CONNECT) {
redisLog(REDIS_NOTICE,"Connecting to MASTER...");
if (connectWithMaster() == REDIS_OK) {
redisLog(REDIS_NOTICE,"MASTER <-> SLAVE sync started");
- if (server.appendonly) rewriteAppendOnlyFileBackground();
}
}
* So slaves can implement an explicit timeout to masters, and will
* be able to detect a link disconnection even if the TCP connection
* will not actually go down. */
- if (!(server.cronloops % (REDIS_REPL_PING_SLAVE_PERIOD*10))) {
+ if (!(server.cronloops % (server.repl_ping_slave_period*10))) {
listIter li;
listNode *ln;
projects / redis.git / blobdiff