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https://issues.apache.org/jira/browse/SPARK-4740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14241524#comment-14241524
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Apache Spark commented on SPARK-4740:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/3667
> Netty's network throughput is about 1/2 of NIO's in spark-perf sortByKey
> ------------------------------------------------------------------------
>
> Key: SPARK-4740
> URL: https://issues.apache.org/jira/browse/SPARK-4740
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle, Spark Core
> Affects Versions: 1.2.0
> Reporter: Zhang, Liye
> Assignee: Reynold Xin
> Attachments: (rxin patch better executor)TestRunner sort-by-key -
> Thread dump for executor 3_files.zip, (rxin patch normal executor)TestRunner
> sort-by-key - Thread dump for executor 0 _files.zip, Spark-perf Test Report
> 16 Cores per Executor.pdf, Spark-perf Test Report.pdf, TestRunner
> sort-by-key - Thread dump for executor 1_files (Netty-48 Cores per node).zip,
> TestRunner sort-by-key - Thread dump for executor 1_files (Nio-48 cores per
> node).zip, rxin_patch-on_4_node_cluster_48CoresPerNode(Unbalance).7z
>
>
> 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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