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Date: Mon, 19 Oct 2009 22:09:59 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-6297) Hadoop's support for zlib library
 lacks support to perform flushes (Z_SYNC_FLUSH and Z_FULL_FLUSH)
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    [ https://issues.apache.org/jira/browse/HADOOP-6297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12767575#action_12767575 ] 

Hadoop QA commented on HADOOP-6297:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12422611/zlibpatch-0.3.patch
  against trunk revision 826141.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/93/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/93/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/93/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/93/console

This message is automatically generated.

> 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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