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RpcEnv already stopped.
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java.lang.IllegalStateException: RpcEnv already stopped. at org.apache.spark.rpc.netty.Dispatcher.postMessage(Dispatcher.scala:165) at org.apache.spark.rpc.netty.Dispatcher.postToAll(Dispatcher.scala:110) at org.apache.spark.rpc.netty.NettyRpcHandler.channelInactive(NettyRpcEnv.scala:618) at org.apache.spark.network.server.TransportRequestHandler.channelInactive(TransportRequestHandler.java:99) at org.apache.spark.network.server.TransportChannelHandler.channelInactive(TransportChannelHandler.java:104) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:208) at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:194) at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75) at io.netty.handler.timeout.IdleStateHandler.channelInactive(IdleStateHandler.java:257) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:208) at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:194) at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:208) at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:194) at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75) at org.apache.spark.network.util.TransportFrameDecoder.channelInactive(TransportFrameDecoder.java:183) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:208) at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:194) at io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:828) at io.netty.channel.AbstractChannel$AbstractUnsafe$7.run(AbstractChannel.java:621) at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:328) at io.netty.util.concurrent.SingleThreadEventExecutor.confirmShutdown(SingleThreadEventExecutor.java:627) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:362) at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111) at java.lang.Thread.run(Thread.java:745)