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From "Ankit Kamboj (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4354) Performance improvement with compressor object reinit restriction
Date Tue, 19 Jun 2012 22:44:42 GMT
Ankit Kamboj created MAPREDUCE-4354:

             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:
            Reporter: Ankit Kamboj
             Fix For:

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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