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From "Xiao Kang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6662) hadoop zlib compression does not fully utilize the buffer
Date Tue, 06 Apr 2010 02:12:34 GMT

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

Xiao Kang updated HADOOP-6662:
------------------------------

    Resolution: Duplicate
        Status: Resolved  (was: Patch Available)

Duplicated with HADOOP-6683.

> 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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