hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4162) CodecPool.getDecompressor(LzopCodec) always creates a brand-new decompressor.
Date Thu, 11 Sep 2008 22:29:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630404#action_12630404
] 

Chris Douglas commented on HADOOP-4162:
---------------------------------------

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.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message