Ankit Kamboj created MAPREDUCE-4354:
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Summary: Performance improvement with compressor object reinit
restriction
Key: MAPREDUCE-4354
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4354
Project: Hadoop Map/Reduce
Issue Type: Improvement
Affects Versions: 0.20.205.0
Reporter: Ankit Kamboj
Fix For: 0.20.205.0
HADOOP-5879 patch aimed at picking the conf (instead of default) settings for
GzipCodec. It also involved re-initializing the recycled compressor object.
On our performance tests, this re-initialization led to performance degradation
of 15% for LzoCodec because re-initialization for Lzo involves reallocation of
buffers. LzoCodec takes the initial settings from config so it is not necessary
to re-initialize it. This patch checks for the codec class and calls reinit
only if the codec class is Gzip. This led to significant performance
improvement of 15% for LzoCodec.
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