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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-18153) refactor reopen in TezTask or WM
Date Wed, 29 Nov 2017 00:52:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-18153?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sergey Shelukhin reassigned HIVE-18153:
---------------------------------------

    Assignee: Sergey Shelukhin

> 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
>            Assignee: 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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