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https://issues.apache.org/jira/browse/HADOOP-11785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14491188#comment-14491188
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Zoran Dimitrijevic commented on HADOOP-11785:
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Sorry, updated wrong jira ticket. Please ignore previous comment.
> Reduce number of listStatus operation in distcp buildListing()
> --------------------------------------------------------------
>
> Key: HADOOP-11785
> URL: https://issues.apache.org/jira/browse/HADOOP-11785
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools/distcp
> Affects Versions: 3.0.0
> Reporter: Zoran Dimitrijevic
> Assignee: Zoran Dimitrijevic
> Priority: Minor
> Fix For: 2.8.0
>
> Attachments: distcp-liststatus.patch, distcp-liststatus2.patch
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> Distcp was taking long time in copyListing.buildListing() for large source
> trees (I was using source of 1.5M files in a tree of about 50K directories).
> For input at s3 buildListing was taking more than one hour. I've noticed a
> performance bug in the current code which does listStatus twice for each
> directory which doubles number of RPCs in some cases (if most directories do
> not contain >1000 files).
>
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