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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11785) Reduce number of listStatus operation in distcp buildListing()
Date Wed, 01 Apr 2015 17:59:53 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14391095#comment-14391095

Hadoop QA commented on HADOOP-11785:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision 4922394.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-tools/hadoop-distcp.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/6041//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/6041//console

This message is automatically generated.

> 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
>         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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