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https://issues.apache.org/jira/browse/HIVE-22441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Mollitor reassigned HIVE-22441:
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> Metrics Subsytem Improvements
> -----------------------------
>
> Key: HIVE-22441
> URL: https://issues.apache.org/jira/browse/HIVE-22441
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 3.2.0
> Reporter: David Mollitor
> Assignee: David Mollitor
> Priority: Major
>
> # CodahaleMetrics uses Guava LoadingCache, which is already thread-safe, and
> then puts an explicit lock around the structure. Use Java 8 new Map API with
> ConcurrentHashMap.
> # Introduce Java 8 APIs
> # Simplifications
> # Updated unit tests to no longer include a 'sleep'
> https://github.com/apache/hive/blob/master/common/src/java/org/apache/hadoop/hive/common/metrics/metrics2/CodahaleMetrics.java#L91-L94
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