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https://issues.apache.org/jira/browse/HDFS-8480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14587279#comment-14587279
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Arpit Agarwal commented on HDFS-8480:
-------------------------------------

[~zhz] oddly I cannot reproduce the Jenkins test failure with your patch 
applied locally.

> 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
>         Attachments: HDFS-8480.00.patch, HDFS-8480.01.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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