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

[Tsz Wo (Nicholas), SZE (JIRA)]

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https://issues.apache.org/jira/browse/HDFS-5869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13891816#comment-13891816
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Tsz Wo (Nicholas), SZE commented on HDFS-5869:
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Hi Vinay,

Thanks for looking at the patch.  FSImage.saveNamespace(..) already has 
endCurrentLogSegment, startLogSegmentAndWriteHeaderTxn and 
writeTransactionIdFileToStorage which are the same things as in rolling edit 
log.

> 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, h5869_20140204b.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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