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From "Tudor Scurtu (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5625) Avoid byte buffer allocations when reading a value from a Result object
Date Fri, 23 Mar 2012 08:31:28 GMT
Avoid byte buffer allocations when reading a value from a Result object
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                 Key: HBASE-5625
                 URL: https://issues.apache.org/jira/browse/HBASE-5625
             Project: HBase
          Issue Type: Improvement
          Components: client
    Affects Versions: 0.92.1
            Reporter: Tudor Scurtu


When calling Result.getValue(), an extra dummy KeyValue and its associated underlying byte
array are allocated, as well as a persistent buffer that will contain the returned value.

These can be avoided by reusing a static array for the dummy object and by passing a ByteBuffer
object as a value destination buffer to the read method.

The current functionality is maintained, and we have added a separate method call stack that
employs the described changes.

On our use case - with large map-reduce jobs - we have noticed a reduction of read time of
up to 40%.

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