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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-2557) Counters don't reset state when readFields() called
Date Thu, 02 Jun 2011 04:56:47 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated MAPREDUCE-2557:
-------------------------------------

    Status: Patch Available  (was: Open)

> Counters don't reset state when readFields() called
> ---------------------------------------------------
>
>                 Key: MAPREDUCE-2557
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2557
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: William Slacum
>            Priority: Trivial
>         Attachments: MAPREDUCE-2557.patch
>
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> When calling readFields() on a Counters object, the internal state is not completely
reset. The IdentityHashMap<Enum<?>, Counter> cache retains all previous mappings,
even after the actual CounterGroups are changed. Using the same Counters pointer over and
over again results in the cache always keeping the mapping for the first call to getCounter(Enum<?>).
I've add a clear() call to the cache when readFields() is called and added a unit test to
verify that it works.

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