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https://issues.apache.org/jira/browse/HADOOP-13164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15487009#comment-15487009
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Steve Loughran commented on HADOOP-13164:
-----------------------------------------
Also, branch-2 have moved all tests to ITest * . this isn't against a current
branch-2. I'm afraid you are going to have to check out branch-2, and adapt to
the new names. Yes, this means anything for branch-2.8 isn't going to
cherrypick seamlessly, but that can be done as a related JIRA *after the patch
is in branch-2+*
> Optimize S3AFileSystem::deleteUnnecessaryFakeDirectories
> --------------------------------------------------------
>
> Key: HADOOP-13164
> URL: https://issues.apache.org/jira/browse/HADOOP-13164
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/s3
> Affects Versions: 2.8.0
> Reporter: Rajesh Balamohan
> Priority: Minor
> Attachments: HADOOP-13164.branch-2-002.patch,
> HADOOP-13164.branch-2.WIP.002.patch, HADOOP-13164.branch-2.WIP.patch
>
>
> https://github.com/apache/hadoop/blob/27c4e90efce04e1b1302f668b5eb22412e00d033/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java#L1224
> deleteUnnecessaryFakeDirectories is invoked in S3AFileSystem during rename
> and on outputstream close() to purge any fake directories. Depending on the
> nesting in the folder structure, it might take a lot longer time as it
> invokes getFileStatus multiple times. Instead, it should be able to break
> out of the loop once a non-empty directory is encountered.
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