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  1. ZooKeeper
  2. ZOOKEEPER-3842

Rolling scale up of zookeeper cluster does not work with reconfigEnabled=false

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Blocker
    • Resolution: Duplicate
    • Affects Version/s: 3.6.1, 3.5.8
    • Fix Version/s: 3.7.0, 3.6.2, 3.5.9
    • Component/s: quorum, server
    • Labels:
    • Flags:
      Important

      Description

      With 
      reconfigEnabled = false (not explicitly setting, relying on the default value).
       
      Install 3 zookeeper servers with 3 zk information in all the 3 zookeeper quorum servers.
       
      Do a rolling scale up of cluster from 3 to 5 with below steps.
       
      1. Install 4th zookeeper with servers list of 1,2,3,4,5
      2. Install 5th zookeeper with servers list of 1,2,3,4,5
      3. Do a rolling restart of servers 1 2 & 3 with servers list of 1,2,3,4,5.
       
      Result/Behavior: quorum is lost.
       
      With this https://issues.apache.org/jira/browse/ZOOKEEPER-2819
      description points at a PR https://github.com/apache/zookeeper/pull/292
      which should have this issue of rolling restart fixed without dynamic reconfiguration feature enabled.
       
      We still see quorum loss issues without dynamic reconfig feature enabled.
       
       

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              • Assignee:
                symat Mate Szalay-Beko
                Reporter:
                kaushik srinivas kaushik srinivas
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                Dates

                • Created:
                  Updated:
                  Resolved: