Daryn Sharp created YARN-6682:
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Summary: Improve performance of AssignmentInformation
datastructures
Key: YARN-6682
URL: https://issues.apache.org/jira/browse/YARN-6682
Project: Hadoop YARN
Issue Type: Sub-task
Affects Versions: 2.8.0
Reporter: Daryn Sharp
Assignee: Daryn Sharp
{{AssignmentInformation}} is inefficient and creates lots of garbage that
increase gc pressure. It creates 3 hashmaps that each contain only 2
enum-based keys. This requires wrapper node objects, boxing/unboxing of ints,
and more expensive lookups than simply using primitive arrays indexed by enum
ordinal.
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