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https://issues.apache.org/jira/browse/HADOOP-4162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630404#action_12630404
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Chris Douglas commented on HADOOP-4162:
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bq. Shouldn't this patch get applied to 0.18 if one wanted to use 0.18 to do
experiments with compression of transient data at large scale?
Intermediate data is compressed using LzoCodec, not LzopCodec. LzopCodec
provides compatibility for users reading streams compressed by the
[lzop|http://www.lzop.org] tool.
> CodecPool.getDecompressor(LzopCodec) always creates a brand-new decompressor.
> -----------------------------------------------------------------------------
>
> Key: HADOOP-4162
> URL: https://issues.apache.org/jira/browse/HADOOP-4162
> Project: Hadoop Core
> Issue Type: Bug
> Affects Versions: 0.18.0
> Reporter: Hong Tang
> Assignee: Arun C Murthy
> Fix For: 0.19.0
>
> Attachments: HADOOP-4162_0_20080911.patch
>
>
> CodecPool.getDecompressor(LzopCodec) always creates a brand-new decompressor.
> I investigated the code, the reason seems to be the following:
> LzopCodec inherits from LzoCodec. The getDecompressorType() method is
> supposed to return the concrete Decompressor class type the specific Codec
> class creates. In this case, LzopCodec creates LzopDecompressors and should
> return LzopDecompressor.class. But instead, it uses the getDecompressorType()
> method defined in the parent and returns LzoDecompressor.class.
> This leads to CodecPool unable to properly recycle the decompressors.
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