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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