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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5583) Add OOB upgrade response and client-side logic for writes
Date Mon, 02 Dec 2013 16:35:35 GMT
Kihwal Lee created HDFS-5583:

             Summary: Add OOB upgrade response and client-side logic for writes
                 Key: HDFS-5583
                 URL: https://issues.apache.org/jira/browse/HDFS-5583
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: 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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