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https://issues.apache.org/jira/browse/HADOOP-4162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630385#action_12630385
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Amir Youssefi commented on HADOOP-4162:
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Before patch:
2008-09-11 21:22:33,169 INFO compress.CodecPool
(CodecPool.java:getDecompressor(121)) - Got brand-new decompressor
2008-09-11 21:22:33,500 INFO compress.CodecPool
(CodecPool.java:getDecompressor(121)) - Got brand-new decompressor
2008-09-11 21:22:33,696 INFO compress.CodecPool
(CodecPool.java:getDecompressor(121)) - Got brand-new decompressor
2008-09-11 21:22:33,904 INFO compress.CodecPool
(CodecPool.java:getDecompressor(121)) - Got brand-new decompressor
2008-09-11 21:22:34,089 INFO compress.CodecPool
(CodecPool.java:getDecompressor(121)) - Got brand-new decompressor
2008-09-11 21:22:34,277 INFO compress.CodecPool
(CodecPool.java:getDecompressor(121)) - Got brand-new decompressor
2008-09-11 21:22:34,465 INFO compress.CodecPool
(CodecPool.java:getDecompressor(121)) - Got brand-new decompressor
2008-09-11 21:22:34,700 INFO compress.CodecPool
(CodecPool.java:getDecompressor(121)) - Got brand-new decompressor
2008-09-11 21:22:34,887 INFO compress.CodecPool
(CodecPool.java:getDecompressor(121)) - Got brand-new decompressor
2008-09-11 21:22:35,074 INFO compress.CodecPool
(CodecPool.java:getDecompressor(121)) - Got brand-new decompressor
After patch:
2008-09-11 21:20:21,454 INFO compress.CodecPool
(CodecPool.java:getDecompressor(121)) - Got brand-new decompressor
> 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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