Mridul Muralidharan created SPARK-7323:
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Summary: 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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