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https://issues.apache.org/jira/browse/HADOOP-6297?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kevin J. Price resolved HADOOP-6297.
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    Resolution: Won't Fix

As JDK 7 provides support for this functionality in the basic Java zlib 
implementation, there is no longer need for this patch.

> Hadoop's support for zlib library lacks support to perform flushes 
> (Z_SYNC_FLUSH and Z_FULL_FLUSH)
> --------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6297
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6297
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io
>            Reporter: Kevin J. Price
>            Assignee: Kevin J. Price
>            Priority: Minor
>         Attachments: zlibpatch-0.3.patch, zlibpatch.patch
>
>
> The zlib library supports the ability to perform two types of flushes when 
> deflating data. It can perform both a Z_SYNC_FLUSH, which forces all input to 
> be written as output and byte-aligned and resets the Huffman coding, and it 
> also supports a Z_FULL_FLUSH, which does the same thing but additionally 
> resets the compression dictionary.  The Hadoop wrapper for the zlib library 
> does not support either of these two methods.
> Adding support should be fairly trivial.  An additional deflate method that 
> takes a fourth "flush" parameter, and a modification to the native c code to 
> accept this fourth parameter and pass it along to the zlib library.  I can 
> submit a patch for this if desired.
> It should be noted that the native SUN Java API is likewise missing this 
> functionality, as has been noted for over a decade here: 
> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4206909



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