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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11827) Speed-up distcp buildListing() using threadpool
Date Sat, 07 Nov 2015 01:05:11 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14994809#comment-14994809
] 

Yongjun Zhang commented on HADOOP-11827:
----------------------------------------

Sorry for the bad format, basically I was asking why use {{---}} rather than {{--}} for command
line switch here, thanks.


> 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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