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Exception thrown in awaitResult
java.io.IOException: Failed to send RPC 7920194824462016141 to /172.27.1.63:41034: java.nio.channels.ClosedChannelException	at org.apache.spark.network.client.TransportClient$3.operationComplete(TransportClient.java:239)	at org.apache.spark.network.client.TransportClient$3.operationComplete(TransportClient.java:226)	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:680)	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:567)	at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:424)	at io.netty.channel.AbstractChannel$AbstractUnsafe.safeSetFailure(AbstractChannel.java:801)	at io.netty.channel.AbstractChannel$AbstractUnsafe.write(AbstractChannel.java:699)	at io.netty.channel.DefaultChannelPipeline$HeadContext.write(DefaultChannelPipeline.java:1122)	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:633)	at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:32)	at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:908)	at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:960)	at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:893)	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:357)	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357)	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)	at java.lang.Thread.run(Thread.java:745)