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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4202) TaskTracker never stops cleanup threads, MiniMRCluster becomes unstable
Date Fri, 07 Nov 2008 00:25:45 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4202?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated HADOOP-4202:
----------------------------------

    Status: Open  (was: Patch Available)

This seems like the wrong fix for two reasons.

# Changing the worker threads to poll at an arbitrary duration solely to accommodate the unit
tests is the wrong tradeoff.
# The default junit policy (also explicitly specified in build.xml) spawns a new JVM for each
TestCase, so it's unclear to me why this should even be an issue. If a TestCase is creating
a new MiniMRCluster for each test, then- in almost all cases- it is using it incorrectly and
the TestCase should be rewritten.

Have I misunderstood the problem? Is this a regression? Is it still an issue? Hudson doesn't
seem to be running any slower...

> TaskTracker never stops cleanup threads, MiniMRCluster becomes unstable
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-4202
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4202
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 0.18.1
>            Reporter: Chris K Wensel
>            Assignee: Chris K Wensel
>            Priority: Minor
>         Attachments: hadoop-4202.patch
>
>
> If many unit tests start/stop unique MiniMRCluster instances, over time the number of
threads in the test vm grow to large causing tests to hang and/or slow down.

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