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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8549) Abort the balancer if an upgrade is in progress
Date Wed, 10 Jun 2015 01:14:00 GMT

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

Andrew Wang updated HDFS-8549:
    Attachment: HDFS-8549.003.patch

Thanks for reviewing Colin. I added a "-runDuringUpgrade" flag and test it in the unit test.

The TestFileTruncate failure also seems unrelated, worked locally.

> 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
>         Attachments: HDFS-8549.001.patch, HDFS-8549.002.patch, HDFS-8549.003.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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