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https://issues.apache.org/jira/browse/HDFS-6247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13971837#comment-13971837
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Nathan Roberts commented on HDFS-6247:
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+1 This will be better than the longish timeout that's in there currently.
Would be good to shorten the read time out back down once this sort of
heartbeat is in place.
> Avoid timeouts for replaceBlock() call by sending intermediate responses to
> Balancer
> ------------------------------------------------------------------------------------
>
> Key: HDFS-6247
> URL: https://issues.apache.org/jira/browse/HDFS-6247
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer, datanode
> Affects Versions: 2.4.0
> Reporter: Vinayakumar B
> Assignee: Vinayakumar B
>
> Currently there is no response sent from target Datanode to Balancer for the
> replaceBlock() calls.
> Since the Block movement for balancing is throttled, complete block movement
> will take time and this could result in timeout at Balancer, which will be
> trying to read the status message.
>
> To Avoid this during replaceBlock() call in in progress Datanode can send
> IN_PROGRESS status messages to Balancer to avoid timeouts and treat
> BlockMovement as failed.
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