[jira] [Created] (HBASE-11405) Multiple invocations of hbck in parallel disables balancer permanently

["bharath v (JIRA)" <ji...@apache.org>]

bharath v created HBASE-11405:
---------------------------------

             Summary: Multiple invocations of hbck in parallel disables balancer permanently 
                 Key: HBASE-11405
                 URL: https://issues.apache.org/jira/browse/HBASE-11405
             Project: HBase
          Issue Type: Bug
          Components: Balancer, hbck
    Affects Versions: 0.99.0
            Reporter: bharath v


This is because of the following piece of code in hbck

{code:borderStyle=solid}
  boolean oldBalancer = admin.setBalancerRunning(false, true);
    try {
      onlineConsistencyRepair();
    }
    finally {
      admin.setBalancerRunning(oldBalancer, false);
    }
{code}

Newer invocations set oldBalancer to false as it was disabled by previous invocations and this disables balancer permanently unless its manually turned on by the user. Easy to reproduce, just run hbck 100 times in a loop in 2 different sessions and you can see that balancer is set to false in the HMaster logs.



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