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From "Carl Steinbach (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-13193) Enable the complication in parallel in single session
Date Sun, 03 Apr 2016 23:37:25 GMT

    [ https://issues.apache.org/jira/browse/HIVE-13193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15223551#comment-15223551
] 

Carl Steinbach commented on HIVE-13193:
---------------------------------------

Changing the component from "HiveServer2" to "Query Processor" since SessionState is not part
of HS2.

[~aihuaxu], there have been some extensive discussions about the problems with SessionState
in other JIRAs and on the HiveDev mailing list. Someone also gave a presentation about it
at the last HiveContrib meetup. I think there is general consensus that many of these problems
stem from a bad mixture of thread local and singleton design patterns in the SessionState
class. Transitioning to a simpler model where a per-Session object is explicitly passed into
the compiler and execution code paths would probably solve many of these issues. This will
require extensive changes to existing code, but don't let this dissuade you -- our current
problems with SessionState are largely the result of many years of quick-fix solutions layered
one atop another.

> Enable the complication in parallel in single session
> -----------------------------------------------------
>
>                 Key: HIVE-13193
>                 URL: https://issues.apache.org/jira/browse/HIVE-13193
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Aihua Xu
>            Assignee: Aihua Xu
>
> Follow up on HIVE-4239. Investigate the needed change to support parallel complication
in the same session. 
> Some operation related stuff should be in OperationState rather than in SessionState.



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