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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5585) FileSystem statistic counters are too high when JVM reuse is enabled.
Date Tue, 07 Apr 2009 21:02:14 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12696751#action_12696751
] 

Chris Douglas commented on HADOOP-5585:
---------------------------------------

+1 TestSequenceFile passes with the latest patch on my machine

> 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, h5585.patch, h5585.patch, 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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