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From "Rajesh Balamohan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13164) Optimize S3AFileSystem::deleteUnnecessaryFakeDirectories
Date Mon, 23 May 2016 08:55:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15296117#comment-15296117

Rajesh Balamohan commented on HADOOP-13164:

Instead of optimizing deleteUnnecessaryFakeDirectories to reduce the number of calls to S3,
need to understand whether it is mandatory to do invoke it from S3*OutputStream.close() /
S3AFileSystem.innerCopyFromLocalFile / S3AFileSystem.innerRename. Thoughts?. 

> 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
> 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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