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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6467) Performance improvement for liststatus on directories in hadoop archives.
Date Fri, 19 Feb 2010 18:26:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12835868#action_12835868
] 

Tsz Wo (Nicholas), SZE commented on HADOOP-6467:
------------------------------------------------

The new patch is great!  It brought down the time to 11mins.
{noformat}
-bash-3.1$ date; time $H ${WC_CMD} ${HAR_FULL}/${DIR} ${TT_WC}3
Fri Feb 19 18:12:01 UTC 2010
10/02/19 18:12:15 INFO input.FileInputFormat: Total input paths to process : 100000
...
10/02/19 18:18:04 INFO mapred.JobClient: Running job: job_201002042035_60236
10/02/19 18:18:05 INFO mapred.JobClient:  map 0% reduce 0%
...
10/02/19 18:22:53 INFO mapred.JobClient:  map 100% reduce 100%
...
10/02/19 18:23:00 INFO mapred.JobClient:     Reduce input records=19137

real    11m0.423s
user    1m59.595s
sys     0m26.681s
{noformat}

> Performance improvement for liststatus on directories in hadoop archives.
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-6467
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6467
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Mahadev konar
>            Assignee: Mahadev konar
>             Fix For: 0.22.0
>
>         Attachments: Archives_performance.docx, Archives_performance.docx, HADOOP-6467.patch,
HADOOP-6467.patch
>
>
> A liststatus call on a directory in hadoop archives leads to ( 2* number of files in
directory) open calls to the namenode. This is very sub optimal and needs to be fixed to make
it performant enough to be used on a daily basis. 

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