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https://issues.apache.org/jira/browse/HADOOP-13368?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mingliang Liu updated HADOOP-13368:
-----------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Status: Resolved (was: Patch Available)
Thanks [~jnp] for the review and commit to {{trunk}}, {{branch-2}} and
{{branch-2.8}}.
> DFSOpsCountStatistics$OpType#fromSymbol and s3a.Statistic#fromSymbol should
> be O(1) operation
> ---------------------------------------------------------------------------------------------
>
> Key: HADOOP-13368
> URL: https://issues.apache.org/jira/browse/HADOOP-13368
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs
> Affects Versions: 2.8.0
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
> Fix For: 2.8.0
>
> Attachments: HADOOP-13368.000.patch, HADOOP-13368.001.patch
>
>
> To lookup, {{DFSOpsCountStatistics$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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