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From "Xiao Kang (JIRA)" <j...@apache.org>
Subject [jira] Reopened: (HADOOP-6662) hadoop zlib compression does not fully utilize the buffer
Date Tue, 30 Mar 2010 06:46:27 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6662?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiao Kang reopened HADOOP-6662:
-------------------------------


Thanks for Hong Tang. Patch is not attached in HADOOP-4196 and the issue is still unresolved
in release-0.20.2.

> hadoop zlib compression does not fully utilize the buffer
> ---------------------------------------------------------
>
>                 Key: HADOOP-6662
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6662
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io
>    Affects Versions: 0.20.2
>            Reporter: Xiao Kang
>         Attachments: ZlibCompressor.patch
>
>
> org.apache.hadoop.io.compress.ZlibCompressonr does not fully utilize its buffer. 
> Its needesInput() return false when there is any data in its buffer (64K by default).
The performance will greately degrade since an JNI call will be invoded at each time the write()
method of CompressonStream is called. 

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