Github user rxin commented on the issue:
https://github.com/apache/spark/pull/14080
There is a test failure
```
[error] Test
org.apache.spark.network.sasl.SaslIntegrationSuite.testAppIsolation failed:
java.lang.RuntimeException: java.lang.NullPointerException
[error] at
org.apache.spark.network.shuffle.ExternalShuffleBlockHandler.handleMessage(ExternalShuffleBlockHandler.java:100)
[error] at
org.apache.spark.network.shuffle.ExternalShuffleBlockHandler.receive(ExternalShuffleBlockHandler.java:83)
[error] at
org.apache.spark.network.sasl.SaslRpcHandler.receive(SaslRpcHandler.java:80)
[error] at
org.apache.spark.network.server.TransportRequestHandler.processRpcRequest(TransportRequestHandler.java:158)
[error] at
org.apache.spark.network.server.TransportRequestHandler.handle(TransportRequestHandler.java:106)
[error] at
org.apache.spark.network.server.TransportChannelHandler.channelRead0(TransportChannelHandler.java:119)
[error] at
org.apache.spark.network.server.TransportChannelHandler.channelRead0(TransportChannelHandler.java:51)
[error] at
io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
[error] at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
[error] at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
[error] at
io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:266)
[error] at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
[error] at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
[error] at
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
[error] at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
[error] at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
[error] at
org.apache.spark.network.util.TransportFrameDecoder.channelRead(TransportFrameDecoder.java:85)
[error] at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
[error] at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
[error] at
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
[error] at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
[error] at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
[error] at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
[error] at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
[error] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
[error] at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
[error] at java.lang.Thread.run(Thread.java:745)
[error] , took 0.073 sec
[error] at
org.apache.spark.network.client.TransportResponseHandler.handle(TransportResponseHandler.java:190)
[error] at
org.apache.spark.network.server.TransportChannelHandler.channelRead0(TransportChannelHandler.java:121)
[error] at
org.apache.spark.network.server.TransportChannelHandler.channelRead0(TransportChannelHandler.java:51)
[error] at
io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
[error] at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
[error] at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
[error] at
io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:266)
[error] at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
[error] at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
[error] at
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
[error] at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
[error] at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
[error] at
org.apache.spark.network.util.TransportFrameDecoder.channelRead(TransportFrameDecoder.java:85)
[error] at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
[error] at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
[error] at
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
[error] at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
[error] at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
[error] at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
[error] at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
[error] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
[error] at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
[error] at java.lang.Thread.run(Thread.java:745)
[info] Test
org.apache.spark.network.sasl.SaslIntegrationSuite.testNoSaslClient started
[info] Test
org.apache.spark.network.sasl.SaslIntegrationSuite.testNoSaslServer started
[info] Test
org.apache.spark.network.sasl.SaslIntegrationSuite.testBadClient started
[info] Test run finished: 1 failed, 0 ignored, 5 total, 1.741s
```
@lovexi you can run the tests locally too with build/sbt test
network-shuffle
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