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https://issues.apache.org/jira/browse/SPARK-4183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14193271#comment-14193271
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Apache Spark commented on SPARK-4183:
-------------------------------------

User 'aarondav' has created a pull request for this issue:
https://github.com/apache/spark/pull/3049

> Enable Netty-based BlockTransferService by default
> --------------------------------------------------
>
>                 Key: SPARK-4183
>                 URL: https://issues.apache.org/jira/browse/SPARK-4183
>             Project: Spark
>          Issue Type: Bug
>            Reporter: Aaron Davidson
>            Assignee: Aaron Davidson
>
> Spark's NettyBlockTransferService relies on Netty to achieve high performance 
> and zero-copy IO, which is a big simplification over the manual connection 
> management that's done in today's NioBlockTransferService. Additionally, the 
> core functionality of the NettyBlockTransferService has been extracted out of 
> spark core into the "network" package, with the intention of reusing this 
> code for SPARK-3796 ([PR 
> #3001|https://github.com/apache/spark/pull/3001/files#diff-54]).
> We should turn NettyBlockTransferService on by default in order to improve 
> debuggability and stability of the network layer (which has historically been 
> more challenging with the current BlockTransferService).



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