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https://issues.apache.org/jira/browse/HADOOP-6467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833514#action_12833514
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Mahadev konar commented on HADOOP-6467:
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nicholas,
these numbers still seem pretty huge. I was getting subsecond lookups for
single files and around max 2-3 seconds for 10K directory file. Is it possible
that you are running on a shared cluster and there could be job scheduling
delays in the HAR runs and less delays in the non HAR runs? (i mean scheduling
of maps could be delayed in case the cluster is shared) ....
> 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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