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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10047) Add a directbuffer Decompressor API to hadoop
Date Thu, 31 Oct 2013 20:44:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13810677#comment-13810677
] 

Hadoop QA commented on HADOOP-10047:
------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12611467/HADOOP-10047-trunk.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 2 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/3258//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/3258//console

This message is automatically generated.

> Add a directbuffer Decompressor API to hadoop
> ---------------------------------------------
>
>                 Key: HADOOP-10047
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10047
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: io
>    Affects Versions: 2.3.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>              Labels: compression
>             Fix For: 3.0.0
>
>         Attachments: DirectCompressor.html, DirectDecompressor.html, HADOOP-10047-WIP.patch,
HADOOP-10047-final.patch, HADOOP-10047-redo-WIP.patch, HADOOP-10047-trunk.patch, HADOOP-10047-with-tests.patch
>
>
> With the Zero-Copy reads in HDFS (HDFS-5260), it becomes important to perform all I/O
operations without copying data into byte[] buffers or other buffers which wrap over them.
> This is a proposal for adding a DirectDecompressor interface to the io.compress, to indicate
codecs which want to surface the direct buffer layer upwards.
> The implementation should work with direct heap/mmap buffers and cannot assume .array()
availability.



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