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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 updated HADOOP-6297:
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Attachment: zlibpatch-0.3.patch
Revised version of the previous patch. The only file that's different is the
unit test:
a) There's now a license block at the top
b) It's now in JUnit4 format
c) It's now three separate test functions
d) The tests bail out early (without failing) if ZlibFactory.isNativeZlibLoaded
returns false.
I suspect that Hudson will bail out of all the tests early, unfortunately, if
it's just not loading the natvie zlib library as I suspect. I don't think
there's much I can do about that, however.
> 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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