[jira] [Created] (HIVE-20547) HS2: support Tez sessions started by someone else (part 1)

["Sergey Shelukhin (JIRA)" <ji...@apache.org>]

Sergey Shelukhin created HIVE-20547:
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             Summary: HS2: support Tez sessions started by someone else (part 1)
                 Key: HIVE-20547
                 URL: https://issues.apache.org/jira/browse/HIVE-20547
             Project: Hive
          Issue Type: Bug
            Reporter: Sergey Shelukhin
            Assignee: Sergey Shelukhin
         Attachments: HIVE-20547.patch

The registry/configs/some code is based on a private patch by [~prasanth_j].
The patch refactors tez pool session to use composition instead of implementation inheritance from TezSessionState, to allow for two implementations of TezSessionState.


For now it's blocked on getClient API in Tez that will be available after 0.9.3 release; however I commented out that path to check that refactoring passes tests.
When 0.9.3 becomes available, we can uncomment and commit.

In part 2, we may add some tests, and also consider other changes that are required for external sessions (e.g. KillQuery, where we cannot assume YARN is present).

We may also consider a WM change that allows for proportional session distribution when the number of external sessions and the number of admin-specified sessions doesn't match, or at least some validation to see that the external sessions are available when applying a RP.



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