Abhishek Modi created YARN-9697:
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Summary: Efficient allocation of Opportunistic containers.
Key: YARN-9697
URL: https://issues.apache.org/jira/browse/YARN-9697
Project: Hadoop YARN
Issue Type: Sub-task
Reporter: Abhishek Modi
Assignee: Abhishek Modi
In the current implementation, opportunistic containers are allocated based on
the number of queued opportunistic container information received in node
heartbeat. This information becomes stale as soon as more opportunistic
containers are allocated on that node.
Allocation of opportunistic containers happens on the same heartbeat in which
AM asks for the containers. When multiple applications request for
Opportunistic containers, containers might get allocated on the same set of
nodes as already allocated containers on the node are not considered while
serving requests from different applications. This can lead to uneven
allocation of Opportunistic containers across the cluster leading to increased
queuing time
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