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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8549) Abort the balancer if an upgrade is in progress
Date Sat, 06 Jun 2015 00:20:01 GMT
Andrew Wang created HDFS-8549:
---------------------------------

             Summary: Abort the balancer if an upgrade is in progress
                 Key: HDFS-8549
                 URL: https://issues.apache.org/jira/browse/HDFS-8549
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: balancer & mover
    Affects Versions: 2.7.0
            Reporter: Andrew Wang
            Assignee: Andrew Wang


Running the balancer during an ongoing upgrade has a negative affect, since DNs do not actually
delete blocks. This means the balancer is making lots of extra replicas and not actually reducing
the disk utilization of over-utilized nodes.



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