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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3740) Make JobInProgress pluggable
Date Tue, 02 Sep 2008 04:28:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12627574#action_12627574
] 

Hadoop QA commented on HADOOP-3740:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12389294/patch3740.txt
  against trunk revision 691091.

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

    +1 tests included.  The patch appears to include 6 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/3154/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3154/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3154/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3154/console

This message is automatically generated.

> Make JobInProgress pluggable
> ----------------------------
>
>                 Key: HADOOP-3740
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3740
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>         Environment: all
>            Reporter: Alejandro Abdelnur
>         Attachments: patch3740.txt
>
>
> By allowing a pluggable JobInProgess it will be possible for provide implementations
that can do a sophisticated task provisioning to the JobTracker. 
> For example, by providing alternate implementations of the {{obtainNewMapTask}}, {{obtainNewReduceTask}}
and {{updateTaskInProgress}} it would be possible to implement a license server that allows
to throttle use of external resources (ie webservices, databases) so at any given time there
are not more than N tasks using a given resource. For this a task could be tagged with the
names of external resources and the license server would keep track of the tasks running per
tag, if the counter reaches zero then the {{obtainNew*Task}} method could return NULL instead
of a task.
>  

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