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Sentinel: same-Sentinel link sharing across masters

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antirez 2015-05-12 17:03:00 +02:00
parent e0a5246f06
commit 9d5e2ed392
1 changed files with 34 additions and 9 deletions
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43
src/sentinel.c
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@ -361,6 +361,7 @@ void sentinelFlushConfig(void);
void sentinelGenerateInitialMonitorEvents(void);
int sentinelSendPing(sentinelRedisInstance *ri);
int sentinelForceHelloUpdateForMaster(sentinelRedisInstance *master);
sentinelRedisInstance *getSentinelRedisInstanceByAddrAndRunID(dict *instances, char *ip, int port, char *runid);
/* ========================= Dictionary types =============================== */
@ -977,15 +978,39 @@ instanceLink *releaseInstanceLink(instanceLink *link, sentinelRedisInstance *ri)
* This way multiple Sentinel objects that refer all to the same physical
* Sentinel instance but in the context of different masters will use
* a single connection, will send a single PING per second for failure
* detection and so forth. */
void tryConnectionSharing(sentinelRedisInstance *ri) {
* detection and so forth.
*
* Return REDIS_OK if a matching Sentinel was found in the context of a
* different master and sharing was performed. Otherwise REDIS_ERR
* is returned. */
int sentinelTryConnectionSharing(sentinelRedisInstance *ri) {
redisAssert(ri->flags & SRI_SENTINEL);
dictIterator *di;
dictEntry *de;
/* TODO:
* 1) Check if there is a match.
* 2) Free our current link.
* 3) Reference the other link and increment its reference count. */
REDIS_NOTUSED(ri);
if (ri->runid == NULL) return REDIS_ERR; /* No way to identify it. */
if (ri->link->refcount > 1) return REDIS_ERR; /* Already shared. */
di = dictGetIterator(sentinel.masters);
while((de = dictNext(di)) != NULL) {
sentinelRedisInstance *master = dictGetVal(de), *match;
/* We want to share with the same physical Senitnel referenced
* in other masters, so skip our master. */
if (master == ri->master) continue;
match = getSentinelRedisInstanceByAddrAndRunID(master->sentinels,
NULL,0,ri->runid);
if (match == ri) continue; /* Should never happen but... safer. */
/* We identified a matching Sentinel, great! Let's free our link
* and use the one of the matching Sentinel. */
releaseInstanceLink(ri->link,NULL);
ri->link = match->link;
match->link->refcount++;
printf("SHARED!\n");
return REDIS_OK;
}
dictReleaseIterator(di);
return REDIS_ERR;
}
/* This function is called when an hiredis connection reported an error.
@ -1572,7 +1597,7 @@ char *sentinelHandleConfiguration(char **argv, int argc) {
}
if (argc == 5) {
si->runid = sdsnew(argv[4]);
tryConnectionSharing(si);
sentinelTryConnectionSharing(si);
}
} else if (!strcasecmp(argv[0],"announce-ip") && argc == 2) {
/* announce-ip <ip-address> */
@ -2249,7 +2274,7 @@ void sentinelProcessHelloMessage(char *hello, int hello_len) {
* for Sentinels we don't have a later chance to fill it,
* so do it now. */
si->runid = sdsnew(token[2]);
tryConnectionSharing(si);
sentinelTryConnectionSharing(si);
sentinelFlushConfig();
}
}