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https://issues.apache.org/jira/browse/HADOOP-6662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851016#action_12851016
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Hong Tang commented on HADOOP-6662:
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This is duplicate for HADOOP-4196.

> 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
>
> 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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