[jira] [Created] (MAPREDUCE-3055) Simplify parameter passing to Application Master from Client. SImplify approach to pass info such appId, ClusterTimestamp and failcount required by App Master.

["Hitesh Shah (JIRA)" <ji...@apache.org>]

Simplify parameter passing to Application Master from Client. SImplify approach to pass info such  appId, ClusterTimestamp and failcount required by App Master.
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                 Key: MAPREDUCE-3055
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3055
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2
    Affects Versions: 0.23.0
            Reporter: Hitesh Shah
            Priority: Minor
             Fix For: 0.23.0


The Application master needs the application attempt id to register with the Applications Manager. To create an appAttemptId object, the appId object(needs cluster timestamp and app id) and failCount are needed.

Currently, all clients need to pass in the appId, cluster timestamp and fail count to the app master for the required objects to be constructed. 

We could look at simplifying this by providing either placeholders that would have values replaced by the app master launcher or setting it  into the environment ( although that requires a set of whitelisted env vars that can only be set by the yarn framework ). 

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