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https://issues.apache.org/jira/browse/HDFS-6247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14074441#comment-14074441
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Charles Lamb commented on HDFS-6247:
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30 seconds would be fine, or maybe even some time based on the socket timeout.
Presently the socket timeout is a constant, but I could see that perhaps being
turned into a configuration parameter in the future. How about .1 *
socketTimeout for the hearbeat interval? Does that make sense?
> 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
> Attachments: HDFS-6247.patch, HDFS-6247.patch, HDFS-6247.patch,
> HDFS-6247.patch
>
>
> 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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