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Date: Mon, 26 Jun 2017 23:40:00 +0000 (UTC)
From: "Mingliang Liu (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.13060181.1490824655000.110370.1498520400254@Atlassian.JIRA>
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References: <JIRA.13060181.1490824655000@Atlassian.JIRA> <JIRA.13060181.1490824655486@jira-lw-us.apache.org>
Subject: [jira] [Commented] (HADOOP-14255) S3A to delete unnecessary fake
 directory objects in mkdirs()
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archived-at: Mon, 26 Jun 2017 23:40:06 -0000


    [ https://issues.apache.org/jira/browse/HADOOP-14255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16063994#comment-16063994 ] 

Mingliang Liu commented on HADOOP-14255:
----------------------------------------

Thanks [~stevel@apache.org] for reporting this. Yes that is very related to this patch and we should address that.

I filed [HADOOP-14594] and attached a patch file. One change is that, we delete {{destDirDepth - 1}} fake directory object instead of {{destDirDepth}}.

> S3A to delete unnecessary fake directory objects in mkdirs()
> ------------------------------------------------------------
>
>                 Key: HADOOP-14255
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14255
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Mingliang Liu
>            Assignee: Mingliang Liu
>             Fix For: 2.9.0, 3.0.0-alpha4
>
>         Attachments: HADOOP-14255.000.patch, HADOOP-14255.001.patch
>
>
> In S3AFileSystem, as an optimization, we delete unnecessary fake directory objects if that directory contains at least one (nested) file. That is done in closing stream of newly created file. However, if the directory becomes non-empty after we just create an empty subdirectory, we do not delete its fake directory object though that fake directory object becomes "unnecessary".
> So in {{S3AFileSystem::mkdirs()}}, we have a pending TODO:
> {quote}
>   // TODO: If we have created an empty file at /foo/bar and we then call
>   // mkdirs for /foo/bar/baz/roo what happens to the empty file /foo/bar/?
>   private boolean innerMkdirs(Path p, FsPermission permission)
> {quote}
> This JIRA is to fix the TODO: provide consistent behavior for a fake directory object between its nested subdirectory and nested file by deleting it.
> See related discussion in [HADOOP-14236]. Thanks [~stevel@apache.org] for discussion.


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