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https://issues.apache.org/jira/browse/HADOOP-5585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12694359#action_12694359
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Chris Douglas commented on HADOOP-5585:
---------------------------------------
This looks good. Just two nits:
* The current patch generates a javadoc warning, and has a malformed reference
to the non-existent method getFileSystemClasses in the docs for
{{FileSystem::getStatistics}}
* This should have a unit test, but that can be part of a separate issue
(possibly once HADOOP-5437 is fixed)
+1 for the functional changes
> FileSystem statistic counters are too high when JVM reuse is enabled.
> ---------------------------------------------------------------------
>
> Key: HADOOP-5585
> URL: https://issues.apache.org/jira/browse/HADOOP-5585
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Priority: Blocker
> Fix For: 0.20.0
>
> Attachments: h5585.patch
>
>
> When JVM reuse is enabled, the FileSystem.Statistics are not cleared between
> tasks. That means that the second task gets credit for its own reads and
> writes as well as the first. The third gets credit for all 3 tasks reads and
> writes.
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