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Date: Fri, 13 Jul 2007 11:46:05 -0700 (PDT)
From: "Owen O'Malley (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Updated: (HADOOP-1553) Extensive logging of C++ application
 can slow down task by an order of magnitude
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     [ https://issues.apache.org/jira/browse/HADOOP-1553?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Owen O'Malley updated HADOOP-1553:
----------------------------------

    Component/s:     (was: pipes)
                 mapred

This applies not only to pipes, but to Java programs too. I'm investigating the cause.

> Extensive logging of C++ application can slow down task by an order of magnitude
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-1553
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1553
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.13.0
>            Reporter: Christian Kunz
>            Assignee: Owen O'Malley
>            Priority: Blocker
>             Fix For: 0.14.0
>
>
> We observed that extensive logging (due to some configuration mistake) of a c++ application using the pipes interface can slow down the task by an order of magnitude. During that time disk usage was not high, with no abnormal memory usage, and basically idle CPU.

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