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https://issues.apache.org/jira/browse/HADOOP-6881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12892488#action_12892488
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Hadoop QA commented on HADOOP-6881:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12450519/h-6881.patch
against trunk revision 979387.
+1 @author. The patch does not contain any @author tags.
-1 tests included. The patch doesn't appear to include any new or modified
tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
-1 javadoc. The javadoc tool appears to have generated 1 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-h4.grid.sp2.yahoo.net/634/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/634/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/634/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/634/console
This message is automatically generated.
> The efficient comparators aren't always used except for BytesWritable and Text
> ------------------------------------------------------------------------------
>
> Key: HADOOP-6881
> URL: https://issues.apache.org/jira/browse/HADOOP-6881
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.20.0
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Fix For: 0.20.3
>
> Attachments: h-6881.patch, HADOOP-6881.patch, HADOOP-6881.patch
>
>
> When we moved from Java 4 to Java 5 (and then 6), there was a change in the
> JVM semantics such that references to a class such as IntWritable.class no
> longer forces initialization. Since all of the Writables depend on their
> class static blocks to register their fast comparators, that can happen
> *after* we look up the comparator. In that case, the framework will fall back
> to the generic comparator that deserializes both keys and does the object
> compare, which may cause a huge slow down in the sort.
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