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https://issues.apache.org/jira/browse/SPARK-12950?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-12950:
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Assignee: (was: Apache Spark)
> Improve performance of BytesToBytesMap
> --------------------------------------
>
> Key: SPARK-12950
> URL: https://issues.apache.org/jira/browse/SPARK-12950
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
>
> When benchmark generated aggregate with grouping keys, the profiling show
> that lookup in BytesToBytesMap took about 90% of the CPU time, we should
> optimize it.
> After profiling with jvisualvm, here are the things that take most of the
> time:
> 1. decode address from Long to baseObject and offset
> 2. calculate hash code
> 3. compare the bytes (equality check)
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