[jira] [Commented] (HDFS-8480) Fix performance and timeout issues in HDFS-7929 by using hard-links to preserve old edit logs instead of copying them

["Colin Patrick McCabe (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-8480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14649924#comment-14649924 ] 

Colin Patrick McCabe commented on HDFS-8480:
--------------------------------------------

Thanks, [~zhz].

> 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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