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https://github.com/fluencelabs/redis
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Sentinel: SENTINEL CKQUORUM command
A way for monitoring systems to check that Sentinel is technically able to reach the quorum and failover, using the currently visible Sentinels.
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@ -2811,6 +2811,31 @@ sentinelRedisInstance *sentinelGetMasterByNameOrReplyError(redisClient *c,
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return ri;
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}
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#define SENTINEL_ISQR_OK 0
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#define SENTINEL_ISQR_NOQUORUM (1<<0)
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#define SENTINEL_ISQR_NOAUTH (1<<1)
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int sentinelIsQuorumReachable(sentinelRedisInstance *master, int *usableptr) {
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dictIterator *di;
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dictEntry *de;
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int usable = 1; /* Number of usable Sentinels. Init to 1 to count myself. */
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int result = SENTINEL_ISQR_OK;
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int voters = dictSize(master->sentinels)+1; /* Known Sentinels + myself. */
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di = dictGetIterator(master->sentinels);
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while((de = dictNext(di)) != NULL) {
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sentinelRedisInstance *ri = dictGetVal(de);
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if (ri->flags & (SRI_S_DOWN|SRI_O_DOWN)) continue;
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usable++;
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}
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dictReleaseIterator(di);
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if (usable < (int)master->quorum) result |= SENTINEL_ISQR_NOQUORUM;
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if (usable < voters/2+1) result |= SENTINEL_ISQR_NOAUTH;
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if (usableptr) *usableptr = usable;
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return result;
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}
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void sentinelCommand(redisClient *c) {
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if (!strcasecmp(c->argv[1]->ptr,"masters")) {
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/* SENTINEL MASTERS */
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@ -2993,6 +3018,32 @@ void sentinelCommand(redisClient *c) {
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dictDelete(sentinel.masters,c->argv[2]->ptr);
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sentinelFlushConfig();
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addReply(c,shared.ok);
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} else if (!strcasecmp(c->argv[1]->ptr,"ckquorum")) {
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/* SENTINEL CKQUORUM <name> */
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sentinelRedisInstance *ri;
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int usable;
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if ((ri = sentinelGetMasterByNameOrReplyError(c,c->argv[2]))
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== NULL) return;
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int result = sentinelIsQuorumReachable(ri,&usable);
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if (result == SENTINEL_ISQR_OK) {
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addReplySds(c, sdscatfmt(sdsempty(),
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"+OK %i usable Sentinels. Quorum and failover authorization "
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"can be reached\r\n",usable));
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} else {
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sds e = sdscatfmt(sdsempty(),
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"-NOQUORUM %i usable Sentinels. ",usable);
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if (result & SENTINEL_ISQR_NOQUORUM)
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e = sdscat(e,"Not enough available Sentinels to reach the"
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" specified quorum for this master");
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if (result & SENTINEL_ISQR_NOAUTH) {
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if (result & SENTINEL_ISQR_NOQUORUM) e = sdscat(e,". ");
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e = sdscat(e, "Not enough available Sentinels to reach the"
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" majority and authorize a failover");
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}
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e = sdscat(e,"\r\n");
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addReplySds(c,e);
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}
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} else if (!strcasecmp(c->argv[1]->ptr,"set")) {
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if (c->argc < 3 || c->argc % 2 == 0) goto numargserr;
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sentinelSetCommand(c);
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