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From "Teddy Choi (JIRA)" <>
Subject [jira] [Updated] (HIVE-1626) stop using java.util.Stack
Date Wed, 22 Feb 2017 03:35:44 GMT


Teddy Choi updated HIVE-1626:
    Attachment: HIVE-1626.2.patch

125 files are changed. Most of files are subclasses of NodeProcessor and Dispatcher. They
now use Deque instead of Stack. However, there were dozens of Stack.get(int) calls, which
is not in ArrayDeque. I implemented Utils.get(Deque, int) for it with Deque.decendingIterator(),
which impacts GC.

> stop using java.util.Stack
> --------------------------
>                 Key: HIVE-1626
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>    Affects Versions: 0.7.0
>            Reporter: John Sichi
>            Assignee: Teddy Choi
>         Attachments: HIVE-1626.2.patch
> 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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