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https://issues.apache.org/jira/browse/HADOOP-6467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12834002#action_12834002
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Mahadev konar commented on HADOOP-6467:
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{noformat}
10/02/14 00:18:22 INFO input.FileInputFormat: Total input paths to process :
100000
...
10/02/14 00:46:52 INFO mapred.JobClient: Running job: job_201002042035_33691
10/02/14 00:46:53 INFO mapred.JobClient: map 0% reduce 0%
{noformat}
nicholas, what is happening between 00:18:22 and 00:46:52. Why is the job
launching taking so much time?
> 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
>
>
> 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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