[jira] [Created] (HIVE-18153) refactor reopen in TezTask or WM

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

Sergey Shelukhin created HIVE-18153:
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             Summary: refactor reopen in TezTask or WM
                 Key: HIVE-18153
                 URL: https://issues.apache.org/jira/browse/HIVE-18153
             Project: Hive
          Issue Type: Sub-task
            Reporter: Sergey Shelukhin


TezTask reopen relies on getting the same session object in terms of setup; WM reopen returns a new session from the pool. 
The former has the advantage of not having to reupload files and stuff... but the object reuse results in a lot of ugly code, and also reopen might be slower on average with the session pool than just getting a session from the pool. Either WM needs to do the object-preserving reopen, or TezTask needs to be refactored. It looks like DAG would have to be rebuilt to do the latter because of some paths tied to a directory of the old session. Let me see if I can get around that; if not we can do the former; and then if the former results in too much ugly code in WM to account for object reuse for different Tez client I'd do the latter anyway since it's a failure path :)



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