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https://issues.apache.org/jira/browse/MAPREDUCE-5962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14065488#comment-14065488
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Hadoop QA commented on MAPREDUCE-5962:
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{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12656314/mapreduce-5962.txt
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 3 new
or modified test files.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. There were no new javadoc warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with
eclipse:eclipse.
{color:red}-1 findbugs{color}. The patch appears to introduce 2 new
Findbugs (version 2.0.3) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:red}-1 core tests{color}. The patch failed these unit tests in
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient:
org.apache.hadoop.mapred.TestReduceFetch
org.apache.hadoop.mapred.TestReduceFetchFromPartialMem
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4750//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4750//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-mapreduce-client-core.html
Console output:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4750//console
This message is automatically generated.
> Support CRC32C in IFile
> -----------------------
>
> Key: MAPREDUCE-5962
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5962
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: performance, task
> Affects Versions: 2.5.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: mapreduce-5962.txt
>
>
> Currently, the IFile format used by the MR shuffle checksums all data using
> the zlib CRC32 polynomial. If we allow use of CRC32C instead, we can get a
> large reduction in CPU usage by leveraging the native hardware CRC32C
> implementation (approx half a second of CPU time savings per GB checksummed).
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