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Posted to common-dev@hadoop.apache.org by "Zoran Dimitrijevic (JIRA)" <ji...@apache.org> on 2015/04/01 19:01:01 UTC

[jira] [Created] (HADOOP-11785) Reduce number of listStatus operation in distcp buildListing()

Zoran Dimitrijevic created HADOOP-11785:
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             Summary: 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: 3.0.0
         Attachments: distcp-liststatus.patch

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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