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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-7076) Splittable Gzip
Date Thu, 23 Dec 2010 10:28:01 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12974591#action_12974591
] 

Hadoop QA commented on HADOOP-7076:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12466874/HADOOP-7076.patch
  against trunk revision 1051659.

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

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

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

    -1 javac.  The patch appears to cause tar ant target to fail.

    -1 findbugs.  The patch appears to introduce 1 new Findbugs (version 1.3.9) warnings.

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

    -1 core tests.  The patch failed these core unit tests:


    -1 contrib tests.  The patch failed contrib unit tests.

    -1 system test framework.  The patch failed system test framework compile.

Test results: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/149//testReport/
Findbugs warnings: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/149//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/149//console

This message is automatically generated.

> Splittable Gzip
> ---------------
>
>                 Key: HADOOP-7076
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7076
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: io
>            Reporter: Niels Basjes
>         Attachments: HADOOP-7076.patch
>
>
> Files compressed with the gzip codec are not splittable due to the nature of the codec.
> This limits the options you have scaling out when reading large gzipped input files.
> Given the fact that gunzipping a 1GiB file usually takes only 2 minutes I figured that
for some use cases wasting some resources may result in a shorter job time under certain conditions.
> So reading the entire input file from the start for each split (wasting resources!!)
may lead to additional scalability.

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