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From "Wilfred Spiegelenburg (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-11323) WritableComparator: default implementation of compare keeps reference to byte array
Date Thu, 20 Nov 2014 10:32:34 GMT
Wilfred Spiegelenburg created HADOOP-11323:
----------------------------------------------

             Summary: WritableComparator: default implementation of compare keeps reference
to byte array
                 Key: HADOOP-11323
                 URL: https://issues.apache.org/jira/browse/HADOOP-11323
             Project: Hadoop Common
          Issue Type: Improvement
          Components: performance
    Affects Versions: 2.5.0
            Reporter: Wilfred Spiegelenburg


When the default compare is used on a WritableComparator a reference to the second passed
in byte array is kept in the buffer. Since WritableComparator keeps a reference to the buffer
the byte will never be garbage collected. This can lead to a higher heap use than needed.

The buffer should drop the reference to the byte array passed in. We can null out the byte
array reference since the buffer is a private variable for the class.



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