[jira] [Created] (TEZ-3389) [Umbrella] Imrove DAG Client/Reporting functionality

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

Hitesh Shah created TEZ-3389:
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             Summary: [Umbrella] Imrove DAG Client/Reporting functionality
                 Key: TEZ-3389
                 URL: https://issues.apache.org/jira/browse/TEZ-3389
             Project: Apache Tez
          Issue Type: Bug
            Reporter: Hitesh Shah


This umbrella jira will cover the various improvements and fixes needed in the client-side layer:
   - Improve the DAGClient APIs to provide access to basic dag plan info ( vertex dependencies, name-to-id mapping, etc)
   - Enhance DAGClient to provide access to task level information similar to MR
   - Allow the DAGClient to be constructed separately outside of the TezClient/Session.
   - Create a CLI which can provide basic reporting/status progress updates functionality for sessions and DAGs.
   - Ensure that the CLI can function against different versions of Tez. i.e. in case of upgrades, there may be a scenario where an older CLI tries to communicate with a newer Tez AM or reads data from ATS where the data was written by a newer version. For a newer CLI, it should be able to fully read older data sets. For an older CLI, it should degrade gracefully whenever possible or error out with a clear message if it cannot handle the data/rpc. 
   - Newer Tez AMs should be able to support requests coming in from older client versions. 




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