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Date: Thu, 16 Jul 2009 18:44:14 -0700 (PDT)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-6148) Implement a pure Java CRC32
 calculator
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    [ https://issues.apache.org/jira/browse/HADOOP-6148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12732298#action_12732298 ] 

Hadoop QA commented on HADOOP-6148:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12413763/hadoop-6148.txt
  against trunk revision 793987.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/578/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/578/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/578/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/578/console

This message is automatically generated.

> Implement a pure Java CRC32 calculator
> --------------------------------------
>
>                 Key: HADOOP-6148
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6148
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: util
>            Reporter: Owen O'Malley
>            Assignee: Todd Lipcon
>         Attachments: benchmarks20090714.txt, benchmarks20090715.txt, crc32-results.txt, hadoop-5598-evil.txt, hadoop-5598-hybrid.txt, hadoop-5598.txt, hadoop-5598.txt, hadoop-6148.txt, hadoop-6148.txt, hadoop-6148.txt, hdfs-297.txt, PureJavaCrc32.java, PureJavaCrc32.java, PureJavaCrc32.java, PureJavaCrc32.java, PureJavaCrc32New.java, PureJavaCrc32NewInner.java, PureJavaCrc32NewLoop.java, TestCrc32Performance.java, TestCrc32Performance.java, TestCrc32Performance.java, TestCrc32Performance.java, TestPureJavaCrc32.java
>
>
> We've seen a reducer writing 200MB to HDFS with replication = 1 spending a long time in crc calculation. In particular, it was spending 5 seconds in crc calculation out of a total of 6 for the write. I suspect that it is the java-jni border that is causing us grief.

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