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Posted to issues@hive.apache.org by "Teddy Choi (JIRA)" <ji...@apache.org> on 2017/02/21 17:03:44 UTC

[jira] [Commented] (HIVE-1626) stop using java.util.Stack

    [ https://issues.apache.org/jira/browse/HIVE-1626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15876290#comment-15876290 ] 

Teddy Choi commented on HIVE-1626:
----------------------------------

[~appodictic], if you don't mind, may I do this issue?

Hive has many optimization rules, and low-latency workloads nowadays. So it became more critical. The node walking library should use Deque (or ArrayDeque) instead of Stack.

> stop using java.util.Stack
> --------------------------
>
>                 Key: HIVE-1626
>                 URL: https://issues.apache.org/jira/browse/HIVE-1626
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>    Affects Versions: 0.7.0
>            Reporter: John Sichi
>            Assignee: Edward Capriolo
>
> We currently use Stack as part of the generic node walking library.  Stack should not be used for this since its inheritance from Vector incurs superfluous synchronization overhead.
> Most projects end up adding an ArrayStack implementation and using that instead.



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