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Jacek Laskowski commented on SPARK-12237: ----------------------------------------- While learning about Spark's internals, I was playing with {{./bin/spark-class org.apache.spark.executor.CoarseGrainedExecutorBackend}} and connecting to Spark Standalone's master. > Unsupported message RpcMessage causes message retries > ----------------------------------------------------- > > Key: SPARK-12237 > URL: https://issues.apache.org/jira/browse/SPARK-12237 > Project: Spark > Issue Type: Bug > Components: Spark Core > Affects Versions: 1.6.0 > Reporter: Jacek Laskowski > > When an unsupported message is sent to an endpoint, Spark throws > {{org.apache.spark.SparkException}} and retries sending the message. It > should *not* since the message is unsupported. > {code} > WARN NettyRpcEndpointRef: Error sending message [message = > RetrieveSparkProps] in 1 attempts > org.apache.spark.SparkException: Unsupported message > RpcMessage(localhost:51137,RetrieveSparkProps,org.apache.spark.rpc.netty.RemoteNettyRpcCallContext@c0a6275) > from localhost:51137 > at > org.apache.spark.rpc.netty.Inbox$$anonfun$process$1$$anonfun$apply$mcV$sp$1.apply(Inbox.scala:105) > at > org.apache.spark.rpc.netty.Inbox$$anonfun$process$1$$anonfun$apply$mcV$sp$1.apply(Inbox.scala:104) > at > org.apache.spark.deploy.master.Master$$anonfun$receiveAndReply$1.applyOrElse(Master.scala:373) > at > org.apache.spark.rpc.netty.Inbox$$anonfun$process$1.apply$mcV$sp(Inbox.scala:104) > at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:204) > at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:100) > at > org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:215) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) > at java.lang.Thread.run(Thread.java:745) > WARN NettyRpcEndpointRef: Error sending message [message = > RetrieveSparkProps] in 2 attempts > org.apache.spark.SparkException: Unsupported message > RpcMessage(localhost:51137,RetrieveSparkProps,org.apache.spark.rpc.netty.RemoteNettyRpcCallContext@73a76a5a) > from localhost:51137 > at > org.apache.spark.rpc.netty.Inbox$$anonfun$process$1$$anonfun$apply$mcV$sp$1.apply(Inbox.scala:105) > at > org.apache.spark.rpc.netty.Inbox$$anonfun$process$1$$anonfun$apply$mcV$sp$1.apply(Inbox.scala:104) > at > org.apache.spark.deploy.master.Master$$anonfun$receiveAndReply$1.applyOrElse(Master.scala:373) > at > org.apache.spark.rpc.netty.Inbox$$anonfun$process$1.apply$mcV$sp(Inbox.scala:104) > at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:204) > at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:100) > at > org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:215) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) > at java.lang.Thread.run(Thread.java:745) > WARN NettyRpcEndpointRef: Error sending message [message = > RetrieveSparkProps] in 3 attempts > org.apache.spark.SparkException: Unsupported message > RpcMessage(localhost:51137,RetrieveSparkProps,org.apache.spark.rpc.netty.RemoteNettyRpcCallContext@670bfda7) > from localhost:51137 > at > org.apache.spark.rpc.netty.Inbox$$anonfun$process$1$$anonfun$apply$mcV$sp$1.apply(Inbox.scala:105) > at > org.apache.spark.rpc.netty.Inbox$$anonfun$process$1$$anonfun$apply$mcV$sp$1.apply(Inbox.scala:104) > at > org.apache.spark.deploy.master.Master$$anonfun$receiveAndReply$1.applyOrElse(Master.scala:373) > at > org.apache.spark.rpc.netty.Inbox$$anonfun$process$1.apply$mcV$sp(Inbox.scala:104) > at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:204) > at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:100) > at > org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:215) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) > at java.lang.Thread.run(Thread.java:745) > Exception in thread "main" java.lang.reflect.UndeclaredThrowableException > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1672) > at > org.apache.spark.deploy.SparkHadoopUtil.runAsSparkUser(SparkHadoopUtil.scala:68) > at > org.apache.spark.executor.CoarseGrainedExecutorBackend$.run(CoarseGrainedExecutorBackend.scala:151) > at > org.apache.spark.executor.CoarseGrainedExecutorBackend$.main(CoarseGrainedExecutorBackend.scala:253) > at > org.apache.spark.executor.CoarseGrainedExecutorBackend.main(CoarseGrainedExecutorBackend.scala) > Caused by: org.apache.spark.SparkException: Error sending message [message = > RetrieveSparkProps] > at > org.apache.spark.rpc.RpcEndpointRef.askWithRetry(RpcEndpointRef.scala:118) > at > org.apache.spark.rpc.RpcEndpointRef.askWithRetry(RpcEndpointRef.scala:77) > at > org.apache.spark.executor.CoarseGrainedExecutorBackend$$anonfun$run$1.apply$mcV$sp(CoarseGrainedExecutorBackend.scala:166) > at > org.apache.spark.deploy.SparkHadoopUtil$$anon$1.run(SparkHadoopUtil.scala:69) > at > org.apache.spark.deploy.SparkHadoopUtil$$anon$1.run(SparkHadoopUtil.scala:68) > at java.security.AccessController.doPrivileged(Native Method) > at javax.security.auth.Subject.doAs(Subject.java:422) > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657) > ... 4 more > Caused by: org.apache.spark.SparkException: Unsupported message > RpcMessage(localhost:51137,RetrieveSparkProps,org.apache.spark.rpc.netty.RemoteNettyRpcCallContext@670bfda7) > from localhost:51137 > at > org.apache.spark.rpc.netty.Inbox$$anonfun$process$1$$anonfun$apply$mcV$sp$1.apply(Inbox.scala:105) > at > org.apache.spark.rpc.netty.Inbox$$anonfun$process$1$$anonfun$apply$mcV$sp$1.apply(Inbox.scala:104) > at > org.apache.spark.deploy.master.Master$$anonfun$receiveAndReply$1.applyOrElse(Master.scala:373) > at > org.apache.spark.rpc.netty.Inbox$$anonfun$process$1.apply$mcV$sp(Inbox.scala:104) > at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:204) > at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:100) > at > org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:215) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) > at java.lang.Thread.run(Thread.java:745) > {code} -- This message was sent by 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