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Posted to dev@zookeeper.apache.org by ijuma <gi...@git.apache.org> on 2018/07/23 14:59:06 UTC

[GitHub] zookeeper issue #451: ZOOKEEPER-2184: Zookeeper Client should re-resolve hos...

Github user ijuma commented on the issue:

    https://github.com/apache/zookeeper/pull/451
  
    Really happy to see this in a released version, thanks everyone.
    
    @anmolnar after testing this with Apache Kafka, it seems like the combination of a reasonably long backoff (1 second) with randomization when the list is small can cause connection timeouts in some cases that one would not expect. The concrete example we saw was usage of localhost which caused ipv4 and ipv6 addresses to be resolved while the only the ipv4 one worked. We had tests that would fail quite often with a connection timeout of 6 seconds because the ipv6 one would be picked continuously.
    
    @rajinisivaram filed a ZooKeeper issue to track a potential future improvement to this logic:
    https://issues.apache.org/jira/browse/ZOOKEEPER-3100


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