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https://issues.apache.org/jira/browse/SPARK-7323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14525110#comment-14525110
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Apache Spark commented on SPARK-7323:
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User 'mridulm' has created a pull request for this issue:
https://github.com/apache/spark/pull/5862
> Use insertAll instead of individual insert while merging combiners
> ------------------------------------------------------------------
>
> Key: SPARK-7323
> URL: https://issues.apache.org/jira/browse/SPARK-7323
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Mridul Muralidharan
>
> Currently we invoke combiners.insert() for each tuple in Aggregator - which
> results in creation of an Iterator per tuple, and iterating over this
> iterator : instead, we can directly call insertAll to avoid the object
> creation, method invocation and iteration overhead - for each tuple when
> combiners are used.
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