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Sentinel: PING trigger improved

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It's ok to ping as soon as the ping period has elapsed since we received
the last PONG, but it's not good that we ping again if there is a
pending ping... With this change we'll send a new ping if there is one
pending only if two times the ping period elapsed since the ping which
is still pending was sent.
This commit is contained in:
antirez 2015-05-12 17:03:53 +02:00
parent 9d5e2ed392
commit 0eb0b55ff0
1 changed files with 4 additions and 1 deletions

5
src/sentinel.c

@ -2498,7 +2498,10 @@ void sentinelSendPeriodicCommands(sentinelRedisInstance *ri) {
retval = redisAsyncCommand(ri->link->cc,
sentinelInfoReplyCallback, ri, "INFO");
if (retval == REDIS_OK) ri->link->pending_commands++;
} else if ((now - ri->link->last_pong_time) > ping_period) {
} else if ((now - ri->link->last_pong_time) > ping_period &&
(ri->link->last_ping_time == 0 ||
now - ri->link->last_ping_time > ping_period*2))
{
/* Send PING to all the three kinds of instances. */
sentinelSendPing(ri);
} else if ((now - ri->last_pub_time) > SENTINEL_PUBLISH_PERIOD) {