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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9426) Rollingupgrade finalization is not backward compatible
Date Fri, 13 Nov 2015 18:38:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15004467#comment-15004467
] 

Vinod Kumar Vavilapalli commented on HDFS-9426:
-----------------------------------------------

Realized there was a follow-up HDFS-8656 to the incompatible change HDFS-7645, so now not
entirely clear which way we should go. IAC, left a comment: https://issues.apache.org/jira/browse/HDFS-7645?focusedCommentId=15004464&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15004464.

> Rollingupgrade finalization is not backward compatible
> ------------------------------------------------------
>
>                 Key: HDFS-9426
>                 URL: https://issues.apache.org/jira/browse/HDFS-9426
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Priority: Blocker
>         Attachments: HDFS-9426.branch-2.7.poc.patch, HDFS-9426.trunk.poc.patch
>
>
> After HDFS-7645, the namenode can return non-null {{rollingUpgradeInfo}} in heatbeat
reponses. 2.7.1 or 2.6.x datanodes won't finalize the upgrade because it's not null.
> NN might have to check the DN version and return different {{rollingUpgradeInfo}}.
> HDFS-8656 recognized the compatibility issue of the changed semantics, but unfortunately
did not address the semantics of the heartbeat response.



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