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https://issues.apache.org/jira/browse/HDFS-742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13993598#comment-13993598
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Mit Desai commented on HDFS-742:
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Taking this over. Feel free to reassign if you are still working on it.
> 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
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
>
> 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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