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https://issues.apache.org/jira/browse/HADOOP-6662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851277#action_12851277
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Xiao Kang commented on HADOOP-6662:
-----------------------------------
Thank you for your notice! However no patch attached for
https://issues.apache.org/jira/browse/HADOOP-4196. HADOOP-4196 discussed more
issues, and this issuse foucus on the zlib compression buffer issuse.
> 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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