Arun Suresh created YARN-5350:
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Summary: Ensure LocalScheduler does not lose the sort order of
allocatable nodes returned by the RM
Key: YARN-5350
URL: https://issues.apache.org/jira/browse/YARN-5350
Project: Hadoop YARN
Issue Type: Sub-task
Reporter: Arun Suresh
Assignee: Arun Suresh
The LocalScheduler receives an ordered list of nodes from the RM with each
allocate call. This list, which is used by the LocalScheduler to allocate
OPPORTUNISTIC containers, is sorted on the Nodes free capacity (queue length /
wait time).
Unfortunately, the LocalScheduler stores this list in a HashMap thereby losing
the sort order.
The trivial fix would be to replace the HashMap with a LinkedHashMap which
retains the insertion order.
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