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https://issues.apache.org/jira/browse/MAPREDUCE-6251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14315354#comment-14315354
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Hadoop QA commented on MAPREDUCE-6251:
--------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  
http://issues.apache.org/jira/secure/attachment/12697887/MAPREDUCE-6251.0.patch
  against trunk revision d5855c0.

    {color:green}+1 @author{color}.  The patch does not contain any @author 
tags.

    {color:red}-1 tests included{color}.  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.

    {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:red}-1 findbugs{color}.  The patch appears to introduce 13 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:green}+1 core tests{color}.  The patch passed unit tests in 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core.

Test results: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5183//testReport/
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5183//artifact/patchprocess/newPatchFindbugsWarningshadoop-mapreduce-client-core.html
Console output: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5183//console

This message is automatically generated.

> JobClient needs additional retries at a higher level to address 
> not-immediately-consistent dfs corner cases
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6251
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6251
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobhistoryserver, mrv2
>    Affects Versions: 2.6.0
>            Reporter: Craig Welch
>            Assignee: Craig Welch
>         Attachments: MAPREDUCE-6251.0.patch
>
>
> The JobClient is used to get job status information for running and completed 
> jobs.  Final state and history for a job is communicated from the application 
> master to the job history server via a distributed file system - where the 
> history is uploaded by the application master to the dfs and then 
> scanned/loaded by the jobhistory server.  While HDFS has strong consistency 
> guarantees not all Hadoop DFS's do.  When used in conjunction with a 
> distributed file system which does not have this guarantee there will be 
> cases where the history server may not see an uploaded file, resulting in the 
> dreaded "no such job" and a null value for the RunningJob in the client.



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