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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8549) Abort the balancer if an upgrade is in progress
Date Tue, 06 Jun 2017 00:52:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Konstantin Shvachko updated HDFS-8549:
--------------------------------------
           Labels:   (was: release-blocker)
     Hadoop Flags: Reviewed
    Fix Version/s: 2.7.4

Just committed to branch-2.7. Thank you [~ajisakaa] for HDFS-11808 backport.

> 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
>             Fix For: 2.8.0, 2.7.4, 3.0.0-alpha1
>
>         Attachments: HDFS-8549.001.patch, HDFS-8549.002.patch, HDFS-8549.003.patch, HDFS-8549.004.patch,
HDFS-8549-branch-2.7.patch
>
>
> 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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