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https://issues.apache.org/jira/browse/HDFS-5645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13867060#comment-13867060
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Jing Zhao commented on HDFS-5645:
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+1 Patch looks good to me. Only one question: in the patch the editlog loader
currently just stops when it hits the upgrade marker. I guess we will have more
sophisticated actions in later jiras?
> 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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