[jira] [Commented] (FLINK-2653) Enable object reuse in MergeIterator

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-2653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14738879#comment-14738879 ] 

ASF GitHub Bot commented on FLINK-2653:
---------------------------------------

GitHub user greghogan opened a pull request:

    https://github.com/apache/flink/pull/1115

    [FLINK-2653] Enable object reuse in MergeIterator

    

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/greghogan/flink 2653_mergeiterator_object_reuse

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/1115.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1115
    
----
commit a9806678ed2dddb56b291282283cf5aea31eba87
Author: Greg Hogan <co...@greghogan.com>
Date:   2015-09-10T13:35:39Z

    [FLINK-2653] Enable object reuse in MergeIterator

----


> Enable object reuse in MergeIterator
> ------------------------------------
>
>                 Key: FLINK-2653
>                 URL: https://issues.apache.org/jira/browse/FLINK-2653
>             Project: Flink
>          Issue Type: Improvement
>          Components: Distributed Runtime
>    Affects Versions: master
>            Reporter: Greg Hogan
>
> MergeIterator currently discards given reusable objects and simply returns a new object from the JVM heap. This inefficiency has a noticeable impact on garbage collection and runtime overhead (~5% overall performance by my measure).



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