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https://issues.apache.org/jira/browse/SPARK-21575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yanbo Liang resolved SPARK-21575.
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Resolution: Fixed
Assignee: Iurii Antykhovych
Fix Version/s: 2.3.0
> Eliminate needless synchronization in java-R serialization
> ----------------------------------------------------------
>
> Key: SPARK-21575
> URL: https://issues.apache.org/jira/browse/SPARK-21575
> Project: Spark
> Issue Type: Improvement
> Components: SparkR
> Affects Versions: 2.2.0
> Reporter: Iurii Antykhovych
> Assignee: Iurii Antykhovych
> Priority: Trivial
> Fix For: 2.3.0
>
>
> As long as {{org.apache.spark.api.r.JVMObjectTracker}} is backed by
> {{ConcurrentHashMap}}, synchronized blocks in {{get(..)}} and {{remove(..)}}
> methods can be safely removed.
> This would eliminate lock contention in {{org.apache.spark.api.r.SerDe}}
> and {{org.apache.spark.api.r.RBackendHandler}}.
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