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https://issues.apache.org/jira/browse/HADOOP-3427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12602404#action_12602404
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Hadoop QA commented on HADOOP-3427:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12382819/3427.patch
against trunk revision 663321.
+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 tests are needed for this patch.
+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 appears to introduce 1 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/2574/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2574/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2574/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2574/console
This message is automatically generated.
> In ReduceTask::fetchOutputs, wait for result can be improved slightly
> ---------------------------------------------------------------------
>
> Key: HADOOP-3427
> URL: https://issues.apache.org/jira/browse/HADOOP-3427
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Devaraj Das
> Assignee: Devaraj Das
> Fix For: 0.18.0
>
> Attachments: 3427.patch, 3427.patch, 3427.patch
>
>
> The getCopyResult call in ReduceTask::fetchOutputs waits for 2 seconds if the
> results list is empty. This can be improved to wait only when sufficient
> number of fetches (above a certain threshold) have been scheduled. The
> threshold should ensure that all the fetcher threads would be busy enough,
> and in this case, the call to getCopyResult would return only when a fetcher
> thread wakes it up.
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