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

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

     [ https://issues.apache.org/jira/browse/HADOOP-11785?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zoran Dimitrijevic updated HADOOP-11785:
----------------------------------------
    Attachment: distcp-liststatus.patch

> 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
>
>   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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