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https://issues.apache.org/jira/browse/HADOOP-13368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15380191#comment-15380191
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Hudson commented on HADOOP-13368:
---------------------------------
SUCCESS: Integrated in Hadoop-trunk-Commit #10110 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/10110/])
HADOOP-13368. DFSOpsCountStatistics$OpType#fromSymbol and (jitendra: rev
c2f9cd584cd7852b4745396494cc0c423eb645c1)
* hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/Statistic.java
*
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSOpsCountStatistics.java
*
hadoop-hdfs-project/hadoop-hdfs-client/src/test/java/org/apache/hadoop/hdfs/TestDFSOpsCountStatistics.java
> DFSOpsCountStatistics$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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