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https://issues.apache.org/jira/browse/SPARK-18196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15625639#comment-15625639
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Apache Spark commented on SPARK-18196:
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User 'a-roberts' has created a pull request for this issue:
https://github.com/apache/spark/pull/15713
> Optimise CompactBuffer implementation
> -------------------------------------
>
> Key: SPARK-18196
> URL: https://issues.apache.org/jira/browse/SPARK-18196
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 1.6.2, 2.0.1
> Reporter: Adam Roberts
> Priority: Minor
>
> This change slightly increases the class footprint (8 bytes on IBM Java, 12
> bytes on OpenJDK and Oracle's) but we've observed a 4% performance on
> PageRank using HiBench large with this change, so a worthy trade-off IMO
> This results in a shorter path length for the JIT as a result of less if else
> statements
> Config used on HiBench
> spark.executor.memory 25G
> spark.driver.memory 4G
> spark.serializer org.apache.spark.serializer.KryoSerializer
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