[jira] [Resolved] (HDFS-5869) When rolling upgrade is in progress, NN should only create checkpoint right before the upgrade marker

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-5869?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE resolved HDFS-5869.
------------------------------------------

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

Thanks Vinay and Jing for reviewing the patch.

I have committed this.

> 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
>             Fix For: HDFS-5535 (Rolling upgrades)
>
>         Attachments: h5869_20140204.patch, h5869_20140204b.patch, h5869_20140205.patch, h5869_20140207.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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