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From "Deneche A. Hakim (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-3811) AtomicRemainder incorrectly accounts for transferred allocations
Date Mon, 21 Sep 2015 02:25:04 GMT

     [ https://issues.apache.org/jira/browse/DRILL-3811?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Deneche A. Hakim updated DRILL-3811:
------------------------------------
    Assignee: Chris Westin  (was: Deneche A. Hakim)

> AtomicRemainder incorrectly accounts for transferred allocations
> ----------------------------------------------------------------
>
>                 Key: DRILL-3811
>                 URL: https://issues.apache.org/jira/browse/DRILL-3811
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Relational Operators
>            Reporter: Deneche A. Hakim
>            Assignee: Chris Westin
>         Attachments: DRILL-3811.1.patch.txt
>
>
> when an allocator takes ownership of a buffer, AtomicRemainder.forceGet(int) is called
to account for the extra memory of the buffer, but when the allocator exceeds it's maximum
allocated memory it accounts for it incorrectly. In the following code, {{availableShared.andAndGet(size)}}
should actually receive {{-size}}:
> {code}
> public boolean forceGet(long size) {
>     if (get(size, this.applyFragmentLimit)) {
>       return true;
>     } else {
>       availableShared.addAndGet(size);
>       if (parent != null) {
>         parent.forceGet(size);
>       }
>       return false;
>     }
>   }
> {code}
> I was able to reproduce the issue in a simple unit test



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