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https://issues.apache.org/jira/browse/HDFS-8480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14645511#comment-14645511
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Zhe Zhang commented on HDFS-8480:
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[~mingma] Thanks for the good catch! Yes this is indeed a flaw in the patch.
I can't think of another use case requiring us to extend {{FSEditLogOp}} as you
suggested. But testing upgrade scenarios itself is a pretty strong motivation.
The only alternative is to manually create some old edit log files.
Once we agree upon a plan I'm happy to make the change.
> Fix performance and timeout issues in HDFS-7929 by using hard-links to
> preserve old edit logs instead of copying them
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-8480
> URL: https://issues.apache.org/jira/browse/HDFS-8480
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.7.0
> Reporter: Zhe Zhang
> Assignee: Zhe Zhang
> Priority: Critical
> Fix For: 2.7.1
>
> Attachments: HDFS-8480.00.patch, HDFS-8480.01.patch,
> HDFS-8480.02.patch, HDFS-8480.03.patch
>
>
> HDFS-7929 copies existing edit logs to the storage directory of the upgraded
> {{NameNode}}. This slows down the upgrade process. This JIRA aims to use
> hard-linking instead of per-op copying to achieve the same goal.
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