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Date: Sat, 6 Jun 2015 00:21:00 +0000 (UTC)
From: "Andrew Wang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12835876.1433549998000.7963.1433550060928@Atlassian.JIRA>
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 <JIRA.12835876.1433549998570@arcas>
Subject: [jira] [Updated] (HDFS-8549) Abort the balancer if an upgrade is in
 progress
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     [ https://issues.apache.org/jira/browse/HDFS-8549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Wang updated HDFS-8549:
------------------------------
    Attachment: HDFS-8549.001.patch

Patch attached.

> 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
>
>
> 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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