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https://issues.apache.org/jira/browse/HDFS-5645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13867530#comment-13867530
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Tsz Wo (Nicholas), SZE commented on HDFS-5645:
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It is correct to just stop at the upgrade marker for supporting rollback. We
should also add ignoring the upgrade marker for the standby NN and supporting
downgrade.
Thanks for reviewing the patch!
> Support upgrade marker in editlog streams
> -----------------------------------------
>
> Key: HDFS-5645
> URL: https://issues.apache.org/jira/browse/HDFS-5645
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: editsStored, h5645_20130103.patch, h5645_20130109.patch
>
>
> During upgrade, a marker can be inserted into the editlog streams so that it
> is possible to roll back to the marker transaction.
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