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https://issues.apache.org/jira/browse/SPARK-18375?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-18375.
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Resolution: Fixed
Fix Version/s: 2.1.0
Issue resolved by pull request 15830
[https://github.com/apache/spark/pull/15830]
> Upgrade netty to 4.0.42.Final
> ------------------------------
>
> Key: SPARK-18375
> URL: https://issues.apache.org/jira/browse/SPARK-18375
> Project: Spark
> Issue Type: Improvement
> Components: Build, Spark Core
> Affects Versions: 1.6.2, 2.0.1
> Reporter: Guoqiang Li
> Priority: Minor
> Fix For: 2.1.0
>
>
> One of the important changes for 4.0.42.Final is "Support any FileRegion
> implementation when using epoll transport
> [#5825|https://github.com/netty/netty/pull/5825]";.
> In
> 4.0.42.Final,[MessageWithHeader|https://github.com/apache/spark/blob/master/common/network-common/src/main/java/org/apache/spark/network/protocol/MessageWithHeader.java]
> can work properly when {{spark.(shufflem, rpc).io.mode}} is set to epoll
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