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WAIT command: synchronous replication for Redis.

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antirez
2013-12-04 15:52:20 +01:00
parent c2f305545a
commit c5618e7fdd
5 changed files with 177 additions and 4 deletions
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29
src/redis.c
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@ -263,7 +263,8 @@ struct redisCommand redisCommandTable[] = {
{"script",scriptCommand,-2,"ras",0,NULL,0,0,0,0,0},
{"time",timeCommand,1,"rR",0,NULL,0,0,0,0,0},
{"bitop",bitopCommand,-4,"wm",0,NULL,2,-1,1,0,0},
{"bitcount",bitcountCommand,-2,"r",0,NULL,1,1,1,0,0}
{"bitcount",bitcountCommand,-2,"r",0,NULL,1,1,1,0,0},
{"wait",waitCommand,3,"rs",0,NULL,0,0,0,0,0}
};
/*============================ Utility functions ============================ */
@ -1200,8 +1201,29 @@ void beforeSleep(struct aeEventLoop *eventLoop) {
if (server.active_expire_enabled && server.masterhost == NULL)
activeExpireCycle(ACTIVE_EXPIRE_CYCLE_FAST);
/* Send all the slaves an ACK request if at least one client blocked
* during the previous event loop iteration. */
if (server.get_ack_from_slaves) {
robj *argv[3];
argv[0] = createStringObject("REPLCONF",8);
argv[1] = createStringObject("GETACK",6);
argv[2] = createStringObject("*",1); /* Not used argument. */
replicationFeedSlaves(server.slaves, server.slaveseldb, argv, 3);
decrRefCount(argv[0]);
decrRefCount(argv[1]);
decrRefCount(argv[2]);
server.get_ack_from_slaves = 0;
}
/* Unblock all the clients blocked for synchronous replication
* in WAIT. */
if (listLength(server.clients_waiting_acks))
processClientsWaitingReplicas();
/* Try to process pending commands for clients that were just unblocked. */
processUnblockedClients();
if (listLength(server.unblocked_clients))
processUnblockedClients();
/* Write the AOF buffer on disk */
flushAppendOnlyFile(0);
@ -1557,6 +1579,8 @@ void initServer() {
server.slaveseldb = -1; /* Force to emit the first SELECT command. */
server.unblocked_clients = listCreate();
server.ready_keys = listCreate();
server.clients_waiting_acks = listCreate();
server.get_ack_from_slaves = 0;
createSharedObjects();
adjustOpenFilesLimit();
@ -2079,6 +2103,7 @@ int processCommand(redisClient *c) {
addReply(c,shared.queued);
} else {
call(c,REDIS_CALL_FULL);
c->woff = server.master_repl_offset;
if (listLength(server.ready_keys))
handleClientsBlockedOnLists();
}