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Posted to mapreduce-dev@hadoop.apache.org by "Robert Joseph Evans (JIRA)" <ji...@apache.org> on 2013/03/19 19:35:15 UTC

[jira] [Created] (MAPREDUCE-5082) CodecPool should avoid OOMs with buggy codecs

Robert Joseph Evans created MAPREDUCE-5082:
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             Summary: CodecPool should avoid OOMs with buggy codecs
                 Key: MAPREDUCE-5082
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5082
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Robert Joseph Evans


I recently found a bug in the gpl compression libraries that was causing map tasks for a particular job to OOM.

https://github.com/omalley/hadoop-gpl-compression/issues/3

Now granted it does not make a lot of sense for a job to use the LzopCodec for map output compression over the LzoCodec, but arguably other codecs could be doing similar things and causing the same sort of memory leaks.  I propose that we do a sanity check when creating a new decompressor/compressor.  If the codec newly created object does not match the value from getType... it should turn off caching for that Codec.

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