1. 27 Sep, 2012 2 commits
    • antirez's avatar
      Sentinel: more robust failover detection as observer. · e01a415d
      antirez authored
      Sentinel observers detect failover checking if a slave attached to the
      monitored master turns into its replication state from slave to master.
      However while this change may in theory only happen after a SLAVEOF NO
      ONE command, in practie it is very easy to reboot a slave instance with
      a wrong configuration that turns it into a master, especially if it was
      a past master before a successfull failover.
      
      This commit changes the detection policy so that if an instance goes
      from slave to master, but at the same time the runid has changed, we
      sense a reboot, and in that case we don't detect a failover at all.
      
      This commit also introduces the "reboot" sentinel event, that is logged
      at "warning" level (so this will trigger an admin notification).
      
      The commit also fixes a problem in the disconnect handler that assumed
      that the instance object always existed, that is not the case. Now we
      no longer assume that redisAsyncFree() will call the disconnection
      handler before returning.
      e01a415d
    • antirez's avatar
      First implementation of Redis Sentinel. · 120ba392
      antirez authored
      This commit implements the first, beta quality implementation of Redis
      Sentinel, a distributed monitoring system for Redis with notification
      and automatic failover capabilities.
      
      More info at http://redis.io/topics/sentinel
      120ba392