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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5869) When rolling upgrade is in progress, NN should only create checkpoint right before the upgrade marker
Date Tue, 04 Feb 2014 01:03:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13890227#comment-13890227
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Tsz Wo (Nicholas), SZE commented on HDFS-5869:
----------------------------------------------

Standby NN should also only checkpoint at right be the upgrade marker.  In more details, when
standby NN starts up, it creates a check point right before the upgrade marker and then does
not create any checkpoint anymore until the rolling upgrade is finalized.

> When rolling upgrade is in progress, NN should only create checkpoint right before the
upgrade marker
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5869
>                 URL: https://issues.apache.org/jira/browse/HDFS-5869
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h5869_20140204.patch
>
>
> - When starting rolling upgrade, NN should create a checkpoint before it writes the upgrade
marker edit log transaction.
> - When rolling upgrade is in progress, NN should reject saveNamespace rpc calls. Further,
if NN restarts, it should create a checkpoint only right before the upgrade marker.



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