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https://issues.apache.org/jira/browse/HADOOP-3142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583931#action_12583931
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Doug Cutting commented on HADOOP-3142:
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The default on linux has long been 1024, so it would be nice if things ran in
that by default.
> Increase the number of open files for unit tests under Hudson
> -------------------------------------------------------------
>
> Key: HADOOP-3142
> URL: https://issues.apache.org/jira/browse/HADOOP-3142
> Project: Hadoop Core
> Issue Type: Bug
> Components: scripts
> Reporter: Owen O'Malley
> Assignee: Mukund Madhugiri
> Fix For: hudson
>
>
> Lucene.zones.apache.org and I assume hudson.zones limit the number of file
> handles to 256. TestMiniMRDFSSort runs better with more file handles. (I set
> it to 10000 in my testing, but a smaller value is probably ok.) I suggest the
> QA scripts increase the ulimit before running the unit tests with "ulimit -n
> 10000".
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