Mingliang Liu created HADOOP-13368:
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Summary: DFSOpsCountStatistics$OpType#fromSymbol and
s3a.Statistic#fromSymbol should be O(1) operation
Key: HADOOP-13368
URL: https://issues.apache.org/jira/browse/HADOOP-13368
Project: Hadoop Common
Issue Type: Sub-task
Affects Versions: 2.8.0
Reporter: Mingliang Liu
Assignee: Mingliang Liu
To lookup, {{DFSOpsCountStatistics$OpType#fromSymbol}} and
{{s3a.Statistic#fromSymbol}} iterates all the enums to get the entry by its
symbol. Usages of {{fromSymbol()}} include {{isTracked()}} and {{getLong()}}.
As there are dozens of enum entries, it merits to make these two similar
operations O(1) complexity. This point is especially true if downstream app
probes a dozen of stats in an outer loop (see [TEZ-3331]).
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