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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-742) A down DataNode makes Balancer to hang on repeatingly asking NameNode its partial block list
Date Wed, 03 Aug 2016 17:07:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15406233#comment-15406233
] 

Kihwal Lee commented on HDFS-742:
---------------------------------

The test failure is due to HDFS-9781.

> A down DataNode makes Balancer to hang on repeatingly asking NameNode its partial block
list
> --------------------------------------------------------------------------------------------
>
>                 Key: HDFS-742
>                 URL: https://issues.apache.org/jira/browse/HDFS-742
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer & mover
>            Reporter: Hairong Kuang
>            Assignee: Mit Desai
>            Priority: Minor
>         Attachments: HDFS-742-trunk.patch, HDFS-742.patch, HDFS-742.v1.trunk.patch
>
>
> We had a balancer that had not made any progress for a long time. It turned out it was
repeatingly asking Namenode for a partial block list of one datanode, which was done while
the balancer was running.
> NameNode should notify Balancer that the datanode is not available and Balancer should
stop asking for the datanode's block list.



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