Capacity scheduler should initialize tasks asynchronously
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Key: HADOOP-4513
URL: https://issues.apache.org/jira/browse/HADOOP-4513
Project: Hadoop Core
Issue Type: Bug
Components: contrib/capacity-sched
Affects Versions: 0.19.0
Reporter: Hemanth Yamijala
Assignee: Sreekanth Ramakrishnan
Currently, the capacity scheduler initializes tasks on demand, as opposed to
the eager initialization technique used by the default scheduler. This is done
in order to save JT memory footprint. However, the initialization is done in
the {{assignTasks}} API which is not a good idea as task initialization could
be a time consuming operation. This JIRA is to move out the initialization
outside the {{assignTasks}} API and do it asynchronously.
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