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From "Zoran Dimitrijevic (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11827) Speed-up distcp buildListing() using threadpool
Date Sat, 11 Apr 2015 21:36:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14491205#comment-14491205
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Zoran Dimitrijevic commented on HADOOP-11827:
---------------------------------------------

Speedup for s3n source tree of 1.5M/50k dirs:
current distcp: 36min
2 threads:   17min
5 threads:   7min
10 threads: 3.5 min
20 threads: 2.3 min

For same source dataset on hdfs:
current distcp: 206 seconds
1 thread:  204 sec
2 threads: 257 sec (not yet sure why, will repeat the experiment)
3 threads: 154 sec
5 threads: 94 sec
10 threads: 51 sec
20 threads: 45 sec


> 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: 3.0.0
>            Reporter: Zoran Dimitrijevic
>            Assignee: Zoran Dimitrijevic
>            Priority: Minor
>         Attachments: HADOOP-11827-02.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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