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Posted to hdfs-dev@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2014/02/25 00:40:22 UTC

[jira] [Resolved] (HDFS-5583) Make DN send an OOB Ack on shutdown before restarting

     [ https://issues.apache.org/jira/browse/HDFS-5583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kihwal Lee resolved HDFS-5583.
------------------------------

       Resolution: Fixed
    Fix Version/s: HDFS-5535 (Rolling upgrades)
     Hadoop Flags: Reviewed

Thanks, Brandon. I've committed this to the RU branch.

> 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
>             Fix For: HDFS-5535 (Rolling upgrades)
>
>         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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