Make JobInProgress pluggable
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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
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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