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https://issues.apache.org/jira/browse/HDFS-5583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910666#comment-13910666
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Brandon Li commented on HDFS-5583:
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+1. The patch looks good to me.
> Make DN send an OOB Ack on shutdown before restarting
> -----------------------------------------------------
>
> Key: HDFS-5583
> URL: https://issues.apache.org/jira/browse/HDFS-5583
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Attachments: HDFS-5583.patch, HDFS-5583.patch, HDFS-5583.patch,
> HDFS-5583.patch
>
>
> Add an ability for data nodes to send an OOB response in order to indicate an
> upcoming upgrade-restart. Client should ignore the pipeline error from the
> node for a configured amount of time and try reconstruct the pipeline without
> excluding the restarted node. If the node does not come back in time,
> regular pipeline recovery should happen.
> This feature is useful for the applications with a need to keep blocks local.
> If the upgrade-restart is fast, the wait is preferable to losing locality.
> It could also be used in general instead of the draining-writer strategy.
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