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https://issues.apache.org/jira/browse/HDFS-15583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17198355#comment-17198355
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Stephen O'Donnell commented on HDFS-15583:
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This patch also applies cleanly to branch-3.1, so the plan is to push it to
branch-3.2 and branch-3.1
[~weichiu] could you give this backport a review please?
> Backport DirectoryScanner improvements HDFS-14476, HDFS-14751 and HDFS-15048
> to branch 3.2 and 3.1
> --------------------------------------------------------------------------------------------------
>
> Key: HDFS-15583
> URL: https://issues.apache.org/jira/browse/HDFS-15583
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.2.0, 3.2.1
> Reporter: Stephen O'Donnell
> Assignee: Stephen O'Donnell
> Priority: Major
> Attachments: HDFS-15583.branch-3.2.001.patch
>
>
> HDFS-14476, HDFS-14751 and HDFS-15048 made some good improvements to the
> datanode DirectoryScanner, but due to a large refactor on that class in
> branch-3.3, they are not trivial to backport to earlier branches.
> HDFS-14476 introduced the problem in HDFS-14751 and a findbugs warning, fixed
> in HDFS-15048, so these 3 need to be backported together.
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