Github user srowen commented on the issue:
https://github.com/apache/spark/pull/14659
@Sherry302 @tgravescs oops it looks like this causes master Maven builds to
fail:
https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/
https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/job/spark-master-test-maven-hadoop-2.3/2000/consoleFull
But not the SBT ones, weird. And it fails REPL tests, with an odd error. I
don't know what's actually going on there.
```
Lost task 0.0 in stage 0.0 (TID 0, localhost):
java.lang.ClassCircularityError:
io/netty/util/internal/__matchers__/org/apache/spark/network/protocol/MessageMatcher
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at
io.netty.util.internal.JavassistTypeParameterMatcherGenerator.generate(JavassistTypeParameterMatcherGenerator.java:62)
at
io.netty.util.internal.JavassistTypeParameterMatcherGenerator.generate(JavassistTypeParameterMatcherGenerator.java:54)
at
io.netty.util.internal.TypeParameterMatcher.get(TypeParameterMatcher.java:42)
at
io.netty.util.internal.TypeParameterMatcher.find(TypeParameterMatcher.java:78)
at
io.netty.handler.codec.MessageToMessageEncoder.<init>(MessageToMessageEncoder.java:59)
at
org.apache.spark.network.protocol.MessageEncoder.<init>(MessageEncoder.java:34)
at
org.apache.spark.network.TransportContext.<init>(TransportContext.java:78)
at
org.apache.spark.rpc.netty.NettyRpcEnv.downloadClient(NettyRpcEnv.scala:354)
at
org.apache.spark.rpc.netty.NettyRpcEnv.openChannel(NettyRpcEnv.scala:324)
```
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