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https://issues.apache.org/jira/browse/MAPREDUCE-4919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14354443#comment-14354443
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Hadoop QA commented on MAPREDUCE-4919:
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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/12563721/MAPREDUCE-4919.patch
against trunk revision 47f7f18.
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 1 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:green}+1 findbugs{color}. The patch does not introduce any 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.TestLineRecordReader
org.apache.hadoop.mapreduce.lib.input.TestLineRecordReader
org.apache.hadoop.mapred.TestMRTimelineEventHandling
org.apache.hadoop.mapred.TestLazyOutput
org.apache.hadoop.mapreduce.v2.TestMROldApiJobs
The following test timeouts occurred in
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient:
org.apache.hadoop.mapreduce.lib.output.TestJobTests
org.apache.hadoop.mapred.TestMRIntermediateDataEncryption
org.apache.hadoop.mapred.TestMRIntermediateDataEncryption
Test results:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5261//testReport/
Console output:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5261//console
This message is automatically generated.
> All maps hangs when set mapreduce.task.io.sort.factor to 1
> ----------------------------------------------------------
>
> Key: MAPREDUCE-4919
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4919
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: client
> Reporter: Jerry Chen
> Assignee: Jerry Chen
> Attachments: MAPREDUCE-4919.patch
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> In one of my testing that when I set mapreduce.task.io.sort.factor to 1, all
> the maps hang and will never end. But the CPU usage for each node are very
> high and until killed by the app master when time out comes, and the job
> failed.
> I traced the problem and found out that all the maps hangs on the final merge
> phase.
> The while loop in computeBytesInMerges will never end with a factor of 1:
> int f = 1; //in my case
> int n = 16; //in my case
> while (n > f || considerFinalMerge) {
> ...
> n -= (f-1);
> f = factor;
> }
> As the f-1 will equals 0 and n will always be 16 and the while runs for ever.
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