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https://issues.apache.org/jira/browse/HDFS-8480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14594400#comment-14594400
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Zhe Zhang commented on HDFS-8480:
---------------------------------
The test in the patch verifies that the earliest edit log op in the pre-created
{{/current}} directory (a mkdir of path {{/TestUpgrade}}) was successfully
retrieved.
> 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-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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