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https://issues.apache.org/jira/browse/HADOOP-3961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12623544#action_12623544
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Hadoop QA commented on HADOOP-3961:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12388338/resourceEstFix.patch
against trunk revision 686893.
+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 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 failed core unit tests.
-1 contrib tests. The patch failed contrib unit tests.
Test results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3068/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3068/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3068/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3068/console
This message is automatically generated.
> resource estimation works badly in some cases
> ---------------------------------------------
>
> Key: HADOOP-3961
> URL: https://issues.apache.org/jira/browse/HADOOP-3961
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.19.0
> Reporter: Ari Rabkin
> Assignee: Ari Rabkin
> Priority: Blocker
> Fix For: 0.19.0
>
> Attachments: resourceEstFix.patch
>
>
> The disk space estimation introduced in HADOOP-657 performs badly under some
> circumstances. In particular, if maps have very small output, the initial
> estimate of output size equals input size throws everything off.
> Fix is to use a smaller initial estimate, and to update it appropriately.
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