Todd Lipcon created MAPREDUCE-4274:
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Summary: MapOutputBuffer should use native byte order for kvmeta
Key: MAPREDUCE-4274
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4274
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: performance, task
Affects Versions: 2.0.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Priority: Minor
I don't have a benchmark to support this, but this should give a small CPU
improvement on the map output buffer: currently, we create {{kvmeta}} as
{{ByteBuffer.wrap(kvbuffer).asIntBuffer()}}. According to the javadocs, the
resulting int buffer will inherit its byte order from the ByteBuffer it comes
from, and the byte buffer defaults to BIG_ENDIAN. Thus, all of our int access
to/from the buffer will require byte-swapping.
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