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From "Mit Desai (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-742) A down DataNode makes Balancer to hang on repeatingly asking NameNode its partial block list
Date Tue, 28 Jul 2015 13:17:05 GMT

     [ https://issues.apache.org/jira/browse/HDFS-742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mit Desai updated HDFS-742:
---------------------------
    Attachment: HDFS-742-trunk.patch

> 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
>         Attachments: HDFS-742-trunk.patch, HDFS-742.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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