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

[Shang Yuanchun (Jira)]

Greg Hogan created FLINK-2653:
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             Summary: 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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