Adam Roberts created SPARK-18196:
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Summary: Optimise CompactBuffer implementation
Key: SPARK-18196
URL: https://issues.apache.org/jira/browse/SPARK-18196
Project: Spark
Issue Type: Improvement
Affects Versions: 2.0.1, 1.6.2
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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