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https://issues.apache.org/jira/browse/SPARK-4853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-4853.
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Resolution: Incomplete
> Automatically adjust the number of connections between two peers to achieve
> good performance
> --------------------------------------------------------------------------------------------
>
> Key: SPARK-4853
> URL: https://issues.apache.org/jira/browse/SPARK-4853
> Project: Spark
> Issue Type: New Feature
> Components: Shuffle
> Affects Versions: 1.2.0
> Reporter: Reynold Xin
> Priority: Major
> Labels: bulk-closed
>
> As discovered in SPARK-4740, performance of the new Netty transport can be
> impacted by the total number of active connections. This manifests itself
> when the following 3 conditions are true:
> (1) # spinning disks per node is large (doesn't affect SSDs)
> (2) # cores/node is large
> (3) # nodes is small
> In 1.2, we created a new config variable
> spark.shuffle.io.numConnectionsPerPeer that allows users to explicitly
> increase the number of connections between any two nodes. Ideally, we should
> have Spark automatically figure out the optimal (or near optimal) setting is
> so users don't have to worry about this config option.
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