[ https://issues.apache.org/jira/browse/HADOOP-3740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Alejandro Abdelnur updated HADOOP-3740:
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Status: Patch Available (was: Open)
> 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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