[jira] [Commented] (MAPREDUCE-5484) YarnChild unnecessarily loads job conf twice

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13752223#comment-13752223 ] 

Hadoop QA commented on MAPREDUCE-5484:
--------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12600350/MAPREDUCE-5484.patch
  against trunk revision .

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

    {color:red}-1 tests included{color}.  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.

    {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-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app.

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

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3967//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3967//console

This message is automatically generated.
                
> YarnChild unnecessarily loads job conf twice
> --------------------------------------------
>
>                 Key: MAPREDUCE-5484
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5484
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: task
>    Affects Versions: 2.1.0-beta
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>              Labels: perfomance
>         Attachments: MAPREDUCE-5484.patch
>
>
> In MR task processes, a JobConf is instantiated with the same job.xml twice, once at the beginning of main() and once in configureTask.  IIUC, the second instantiation is not necessary.  These take time reading from disk and parsing XML.
> Removing the second instantiation shaved a second off the average map task time in a 1,000-map sleep job.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira