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https://issues.apache.org/jira/browse/HDFS-8480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14573881#comment-14573881
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Andrew Wang commented on HDFS-8480:
-----------------------------------
If we don't get this in, we should probably revert HDFS-7929 from branch-2.7,
since it can greatly slow down JN startup. Can retarget this for 2.8.0 then.
> Fix performance and timeout issues in HDFS-7929: use hard-links instead of
> copying edit logs
> --------------------------------------------------------------------------------------------
>
> 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
>
> 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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