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https://issues.apache.org/jira/browse/HADOOP-11827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14996139#comment-14996139
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Zoran Dimitrijevic commented on HADOOP-11827:
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I did this long time ago... I have no preference about using - or --. I think I
did it the way all other command line arguments in distcp were done, so if we
need any fix it will probably be for all options?
> Speed-up distcp buildListing() using threadpool
> -----------------------------------------------
>
> Key: HADOOP-11827
> URL: https://issues.apache.org/jira/browse/HADOOP-11827
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools/distcp
> Affects Versions: 2.7.0, 2.7.1
> Reporter: Zoran Dimitrijevic
> Assignee: Zoran Dimitrijevic
> Fix For: 2.8.0
>
> Attachments: HADOOP-11827-02.patch, HADOOP-11827-03.patch,
> HADOOP-11827-04.patch, HADOOP-11827.patch
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> For very large source trees on s3 distcp is taking long time to build file
> listing (client code, before starting mappers). For a dataset I used (1.5M
> files, 50K dirs) it was taking 65 minutes before my fix in HADOOP-11785 and
> 36 minutes after the fix).
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