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https://issues.apache.org/jira/browse/MAPREDUCE-5222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13655793#comment-13655793
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Zhijie Shen commented on MAPREDUCE-5222:
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{quote}
Also, is this everything in JobClient? 
{quote}

submitJobInternal(). Thought it should be called internally, however, it's 
accessible to the public.

And 4 public static variables, which are no longer used in 2.x. The problem 
again is that they were accessible to the public:

boolean MAPREDUCE_CLIENT_RETRY_POLICY_ENABLED_DEFAULT    
String MAPREDUCE_CLIENT_RETRY_POLICY_ENABLED_KEY         
String MAPREDUCE_CLIENT_RETRY_POLICY_SPEC_DEFAULT        
String MAPREDUCE_CLIENT_RETRY_POLICY_SPEC_KEY

                
> Add missing methods to JobClient 
> ---------------------------------
>
>                 Key: MAPREDUCE-5222
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5222
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>    Affects Versions: 2.0.4-alpha
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>             Fix For: 2.0.5-beta
>
>         Attachments: mr-5222.patch, mr-5222.patch, mr-5222-rte.patch
>
>
> JobClient is missing the following two public methods we need to add for 
> binary compatibility:
> # static isJobDirValid(Path, FileSystem)
> # Path getStagingAreaDir()

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