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