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In some limited testing with Redis Cluster I've identified the following conditions where a failed master would be unable to failover:

  • The obvious, all the slaves have failed
  • All of a master's slaves on the majority partition are out of sync with their master
  • A master and all of it's slaves are all in a minority partition
  • Used memory is greater than the "maxmemory" config (if keys don't expire)

    We plan on monitoring for these types of conditions, so ops can intervene before a Redis cluster goes unhealthy.

    What other points of failure does a Redis Cluster have?

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