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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5583) Make DN send an OOB Ack on shutdown before restaring
Date Tue, 11 Feb 2014 05:29:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13897545#comment-13897545
] 

Kihwal Lee commented on HDFS-5583:
----------------------------------

This jira depends on HDFS-5585. I will post a patch, which applies on top of HDFS-5585.

> Make DN send an OOB Ack on shutdown before restaring
> ----------------------------------------------------
>
>                 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
>
> 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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