Zhang, Liye created SPARK-4740:
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Summary: Netty's network bandwidth is much lower than NIO in
spark-perf and Netty takes longer running time
Key: SPARK-4740
URL: https://issues.apache.org/jira/browse/SPARK-4740
Project: Spark
Issue Type: Improvement
Components: Shuffle, Spark Core
Reporter: Zhang, Liye
When testing current spark master (1.3.0-snapshot) with spark-perf
(sort-by-key, aggregate-by-key, etc), Netty based shuffle transferService takes
much longer time than NIO based shuffle transferService. The network throughput
of Netty is only about half of that of NIO.
We tested with standalone mode, and the data set we used for test is 20 billion
records, and the total size is about 400GB. Spark-perf test is Running on a 4
node cluster with 10G NIC, 48 cpu cores per node and each executor memory is
64GB. The reduce tasks number is set to 1000.
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