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Date: Wed, 1 Aug 2007 20:23:53 -0700 (PDT)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (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:comment-tabpanel#action_12517133 ] 

Hadoop QA commented on HADOOP-1553:
-----------------------------------

+1

http://issues.apache.org/jira/secure/attachment/12363013/new-log-3.patch applied and successfully tested against trunk revision r561975.

Test results:   http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/506/testReport/
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/506/console

> 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
>
>         Attachments: new-log-2.patch, new-log-3.patch
>
>
> 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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