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https://issues.apache.org/jira/browse/MAPREDUCE-4819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13506601#comment-13506601
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Hadoop QA commented on MAPREDUCE-4819:
--------------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12555369/MAPREDUCE-4819.2.patch
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 6 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}. The javadoc tool did not generate any
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 1.3.9) 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-app
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs:
org.apache.hadoop.mapreduce.v2.app.TestFail
org.apache.hadoop.mapreduce.v2.app.TestKill
org.apache.hadoop.mapreduce.v2.app.job.impl.TestMapReduceChildJVM
org.apache.hadoop.mapreduce.v2.app.TestMRClientService
org.apache.hadoop.mapreduce.v2.app.TestStagingCleanup
org.apache.hadoop.mapreduce.v2.app.job.impl.TestJobImpl
org.apache.hadoop.mapreduce.v2.app.job.impl.TestTaskAttempt
org.apache.hadoop.mapreduce.v2.hs.TestJobHistoryEvents
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3081//testReport/
Console output:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3081//console
This message is automatically generated.
> AM can rerun job after reporting final job status to the client
> ---------------------------------------------------------------
>
> Key: MAPREDUCE-4819
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4819
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mr-am
> Affects Versions: 0.23.3, 2.0.1-alpha
> Reporter: Jason Lowe
> Assignee: Bikas Saha
> Priority: Critical
> Attachments: MAPREDUCE-4819.1.patch, MAPREDUCE-4819.2.patch
>
>
> If the AM reports final job status to the client but then crashes before
> unregistering with the RM then the RM can run another AM attempt. Currently
> AM re-attempts assume that the previous attempts did not reach a final job
> state, and that causes the job to rerun (from scratch, if the output format
> doesn't support recovery).
> Re-running the job when we've already told the client the final status of the
> job is bad for a number of reasons. If the job failed, it's confusing at
> best since the client was already told the job failed but the subsequent
> attempt could succeed. If the job succeeded there could be data loss, as a
> subsequent job launched by the client tries to consume the job's output as
> input just as the re-attempt starts removing output files in preparation for
> the output commit.
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