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From kant kodali <kanth...@gmail.com>
Subject Livy unable to recover spark session using yarn. using livy 0.4.0 & spark 2.3.0 & hadoop 2.7.2
Date Tue, 20 Mar 2018 10:43:45 GMT
Hi All,

I am using Yarn and had set the following setting in livy.conf but Livy was
unable to recover the session moreover the spark job spawned by Livy got
killed when it is supposed to be running.  Below is the stack trace. I am
not sure what to deduce from it?

The following are the settings I set in livy.conf that are needed for
recovery. I did not set anything for "livy.spark.deploy-mode" (It's
actually commented out)

livy.spark.master = yarn

livy.server.recovery.mode = recovery

livy.server.recovery.state-store = zookeeper

livy.server.recovery.state-store.url = localhost:2181



Here is my stacktrace

18/03/20 09:15:57 INFO ZooKeeper: Client
environment:user.dir=/home/ubuntu/livy-0.4.0-incubating-bin/bin
18/03/20 09:15:57 INFO ZooKeeper: Initiating client connection,
connectString=x.x.x.x:2181 sessionTimeout=60000
watcher=org.apache.curator.ConnectionState@4ae9cfc1
18/03/20 09:15:57 INFO StateStore$: Using ZooKeeperStateStore for recovery.
18/03/20 09:15:57 INFO ClientCnxn: Opening socket connection to server
x.x.x.x/x.x.x.x:2181. Will not attempt to authenticate using SASL
(unknown error)
18/03/20 09:15:57 INFO ClientCnxn: Socket connection established to
x.x.x.x/x.x.x.x:2181, initiating session
18/03/20 09:15:57 INFO ClientCnxn: Session establishment complete on
server x.x.x.x/x.x.x.x:2181, sessionid = 0x162426cb5710007, negotiated
timeout = 60000
18/03/20 09:15:57 INFO ConnectionStateManager: State change: CONNECTED
18/03/20 09:15:57 INFO BatchSessionManager: Recovered 0 batch
sessions. Next session id: 0
18/03/20 09:15:58 ERROR RSCClient: Failed to connect to context.
java.net.ConnectException: Connection refused:
x.x.x.x.us-west-2.compute.internal/x.x.x.x:10001
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
    at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:224)
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:289)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:528)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
    at java.lang.Thread.run(Thread.java:748)
18/03/20 09:15:58 INFO InteractiveSessionManager: Recovered 1
interactive sessions. Next session id: 4
18/03/20 09:15:58 INFO InteractiveSessionManager: Registering new session 3
18/03/20 09:15:58 INFO InteractiveSessionManager: Heartbeat watchdog
thread started.
18/03/20 09:15:58 ERROR RSCClient: RPC error.
java.net.ConnectException: Connection refused:
x.x.x.x.us-west-2.compute.internal/x.x.x.x:10001
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
    at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:224)
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:289)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:528)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
    at java.lang.Thread.run(Thread.java:748)
18/03/20 09:15:58 INFO WebServer: Starting server on
http://x.x.x.x.us-west-2.compute.internal:8998
18/03/20 09:18:32 ERROR SessionServlet$: internal error
java.util.concurrent.ExecutionException: java.net.ConnectException:
Connection refused: x.x.x.x.us-west-2.compute.internal/x.x.x.x:10001
    at io.netty.util.concurrent.AbstractFuture.get(AbstractFuture.java:37)
    at org.apache.livy.server.interactive.InteractiveSession.statements(InteractiveSession.scala:471)
    at org.apache.livy.server.interactive.InteractiveSessionServlet$$anonfun$7$$anonfun$apply$3.apply(InteractiveSessionServlet.scala:103)
    at org.apache.livy.server.interactive.InteractiveSessionServlet$$anonfun$7$$anonfun$apply$3.apply(InteractiveSessionServlet.scala:102)
    at org.apache.livy.server.interactive.SessionHeartbeatNotifier$$anonfun$withViewAccessSession$1.apply(SessionHeartbeat.scala:69)
    at org.apache.livy.server.interactive.SessionHeartbeatNotifier$$anonfun$withViewAccessSession$1.apply(SessionHeartbeat.scala:67)
    at org.apache.livy.server.SessionServlet.doWithSession(SessionServlet.scala:221)
    at org.apache.livy.server.SessionServlet.withViewAccessSession(SessionServlet.scala:205)
    at org.apache.livy.server.interactive.InteractiveSessionServlet.org$apache$livy$server$interactive$SessionHeartbeatNotifier$$super$withViewAccessSession(InteractiveSessionServlet.scala:40)
    at org.apache.livy.server.interactive.SessionHeartbeatNotifier$class.withViewAccessSession(SessionHeartbeat.scala:67)
    at org.apache.livy.server.interactive.InteractiveSessionServlet.withViewAccessSession(InteractiveSessionServlet.scala:40)
    at org.apache.livy.server.interactive.InteractiveSessionServlet$$anonfun$7.apply(InteractiveSessionServlet.scala:102)
    at org.scalatra.ScalatraBase$class.org$scalatra$ScalatraBase$$liftAction(ScalatraBase.scala:270)
    at org.scalatra.ScalatraBase$$anonfun$invoke$1.apply(ScalatraBase.scala:265)
    at org.scalatra.ScalatraBase$$anonfun$invoke$1.apply(ScalatraBase.scala:265)
    at org.scalatra.ApiFormats$class.withRouteMultiParams(ApiFormats.scala:178)
    at org.apache.livy.server.JsonServlet.withRouteMultiParams(JsonServlet.scala:39)
    at org.scalatra.ScalatraBase$class.invoke(ScalatraBase.scala:264)
    at org.scalatra.ScalatraServlet.invoke(ScalatraServlet.scala:49)
    at org.scalatra.ScalatraBase$$anonfun$runRoutes$1$$anonfun$apply$8.apply(ScalatraBase.scala:240)
    at org.scalatra.ScalatraBase$$anonfun$runRoutes$1$$anonfun$apply$8.apply(ScalatraBase.scala:238)
    at scala.Option.flatMap(Option.scala:170)
    at org.scalatra.ScalatraBase$$anonfun$runRoutes$1.apply(ScalatraBase.scala:238)
    at org.scalatra.ScalatraBase$$anonfun$runRoutes$1.apply(ScalatraBase.scala:237)
    at scala.collection.immutable.Stream.flatMap(Stream.scala:446)
    at org.scalatra.ScalatraBase$class.runRoutes(ScalatraBase.scala:237)
    at org.scalatra.ScalatraServlet.runRoutes(ScalatraServlet.scala:49)
    at org.scalatra.ScalatraBase$class.runActions$1(ScalatraBase.scala:163)
    at org.scalatra.ScalatraBase$$anonfun$executeRoutes$1.apply$mcV$sp(ScalatraBase.scala:175)
    at org.scalatra.ScalatraBase$$anonfun$executeRoutes$1.apply(ScalatraBase.scala:175)
    at org.scalatra.ScalatraBase$$anonfun$executeRoutes$1.apply(ScalatraBase.scala:175)
    at org.scalatra.ScalatraBase$class.org$scalatra$ScalatraBase$$cradleHalt(ScalatraBase.scala:193)
    at org.scalatra.ScalatraBase$class.executeRoutes(ScalatraBase.scala:175)
    at org.scalatra.ScalatraServlet.executeRoutes(ScalatraServlet.scala:49)
    at org.scalatra.ScalatraBase$$anonfun$handle$1.apply$mcV$sp(ScalatraBase.scala:113)
    at org.scalatra.ScalatraBase$$anonfun$handle$1.apply(ScalatraBase.scala:113)
    at org.scalatra.ScalatraBase$$anonfun$handle$1.apply(ScalatraBase.scala:113)
    at scala.util.DynamicVariable.withValue(DynamicVariable.scala:57)
    at org.scalatra.DynamicScope$class.withResponse(DynamicScope.scala:80)
    at org.scalatra.ScalatraServlet.withResponse(ScalatraServlet.scala:49)
    at org.scalatra.DynamicScope$$anonfun$withRequestResponse$1.apply(DynamicScope.scala:60)
    at scala.util.DynamicVariable.withValue(DynamicVariable.scala:57)
    at org.scalatra.DynamicScope$class.withRequest(DynamicScope.scala:71)
    at org.scalatra.ScalatraServlet.withRequest(ScalatraServlet.scala:49)
    at org.scalatra.DynamicScope$class.withRequestResponse(DynamicScope.scala:59)
    at org.scalatra.ScalatraServlet.withRequestResponse(ScalatraServlet.scala:49)
    at org.scalatra.ScalatraBase$class.handle(ScalatraBase.scala:111)
    at org.scalatra.ScalatraServlet.org$scalatra$servlet$ServletBase$$super$handle(ScalatraServlet.scala:49)
    at org.scalatra.servlet.ServletBase$class.handle(ServletBase.scala:43)
    at org.apache.livy.server.SessionServlet.org$scalatra$MethodOverride$$super$handle(SessionServlet.scala:39)
    at org.scalatra.MethodOverride$class.handle(MethodOverride.scala:28)
    at org.apache.livy.server.SessionServlet.org$scalatra$GZipSupport$$super$handle(SessionServlet.scala:39)
    at org.scalatra.GZipSupport$$anonfun$handle$1.apply$mcV$sp(GZipSupport.scala:34)
    at org.scalatra.GZipSupport$$anonfun$handle$1.apply(GZipSupport.scala:19)
    at org.scalatra.GZipSupport$$anonfun$handle$1.apply(GZipSupport.scala:19)
    at scala.util.DynamicVariable.withValue(DynamicVariable.scala:57)
    at org.scalatra.DynamicScope$class.withResponse(DynamicScope.scala:80)
    at org.scalatra.ScalatraServlet.withResponse(ScalatraServlet.scala:49)
    at org.scalatra.DynamicScope$$anonfun$withRequestResponse$1.apply(DynamicScope.scala:60)
    at scala.util.DynamicVariable.withValue(DynamicVariable.scala:57)
    at org.scalatra.DynamicScope$class.withRequest(DynamicScope.scala:71)
    at org.scalatra.ScalatraServlet.withRequest(ScalatraServlet.scala:49)
    at org.scalatra.DynamicScope$class.withRequestResponse(DynamicScope.scala:59)
    at org.scalatra.ScalatraServlet.withRequestResponse(ScalatraServlet.scala:49)
    at org.scalatra.GZipSupport$class.handle(GZipSupport.scala:18)
    at org.apache.livy.server.interactive.InteractiveSessionServlet.org$scalatra$servlet$FileUploadSupport$$super$handle(InteractiveSessionServlet.scala:40)
    at org.scalatra.servlet.FileUploadSupport$class.handle(FileUploadSupport.scala:93)
    at org.apache.livy.server.interactive.InteractiveSessionServlet.handle(InteractiveSessionServlet.scala:40)
    at org.scalatra.ScalatraServlet.service(ScalatraServlet.scala:54)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
    at org.eclipse.jetty.server.Server.handle(Server.java:499)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
    at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.ConnectException: Connection refused:
x.x.x.x.us-west-2.compute.internal/x.x.x.x:10001
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
    at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:224)
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:289)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:528)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
    ... 1 more
18/03/20 09:18:36 ERROR SessionServlet$: internal error
java.util.concurrent.ExecutionException: java.net.ConnectException:
Connection refused: x.x.x.x.us-west-2.compute.internal/x.x.x.x:10001
    at io.netty.util.concurrent.AbstractFuture.get(AbstractFuture.java:37)
    at org.apache.livy.server.interactive.InteractiveSession.statements(InteractiveSession.scala:471)
    at org.apache.livy.server.interactive.InteractiveSessionServlet$$anonfun$7$$anonfun$apply$3.apply(InteractiveSessionServlet.scala:103)
    at org.apache.livy.server.interactive.InteractiveSessionServlet$$anonfun$7$$anonfun$apply$3.apply(InteractiveSessionServlet.scala:102)
    at org.apache.livy.server.interactive.SessionHeartbeatNotifier$$anonfun$withViewAccessSession$1.apply(SessionHeartbeat.scala:69)
    at org.apache.livy.server.interactive.SessionHeartbeatNotifier$$anonfun$withViewAccessSession$1.apply(SessionHeartbeat.scala:67)
    at org.apache.livy.server.SessionServlet.doWithSession(SessionServlet.scala:221)
    at org.apache.livy.server.SessionServlet.withViewAccessSession(SessionServlet.scala:205)
    at org.apache.livy.server.interactive.InteractiveSessionServlet.org$apache$livy$server$interactive$SessionHeartbeatNotifier$$super$withViewAccessSession(InteractiveSessionServlet.scala:40)
    at org.apache.livy.server.interactive.SessionHeartbeatNotifier$class.withViewAccessSession(SessionHeartbeat.scala:67)
    at org.apache.livy.server.interactive.InteractiveSessionServlet.withViewAccessSession(InteractiveSessionServlet.scala:40)
    at org.apache.livy.server.interactive.InteractiveSessionServlet$$anonfun$7.apply(InteractiveSessionServlet.scala:102)
    at org.scalatra.ScalatraBase$class.org$scalatra$ScalatraBase$$liftAction(ScalatraBase.scala:270)
    at org.scalatra.ScalatraBase$$anonfun$invoke$1.apply(ScalatraBase.scala:265)
    at org.scalatra.ScalatraBase$$anonfun$invoke$1.apply(ScalatraBase.scala:265)
    at org.scalatra.ApiFormats$class.withRouteMultiParams(ApiFormats.scala:178)
    at org.apache.livy.server.JsonServlet.withRouteMultiParams(JsonServlet.scala:39)
    at org.scalatra.ScalatraBase$class.invoke(ScalatraBase.scala:264)
    at org.scalatra.ScalatraServlet.invoke(ScalatraServlet.scala:49)
    at org.scalatra.ScalatraBase$$anonfun$runRoutes$1$$anonfun$apply$8.apply(ScalatraBase.scala:240)
    at org.scalatra.ScalatraBase$$anonfun$runRoutes$1$$anonfun$apply$8.apply(ScalatraBase.scala:238)
    at scala.Option.flatMap(Option.scala:170)
    at org.scalatra.ScalatraBase$$anonfun$runRoutes$1.apply(ScalatraBase.scala:238)
    at org.scalatra.ScalatraBase$$anonfun$runRoutes$1.apply(ScalatraBase.scala:237)
    at scala.collection.immutable.Stream.flatMap(Stream.scala:446)
    at org.scalatra.ScalatraBase$class.runRoutes(ScalatraBase.scala:237)
    at org.scalatra.ScalatraServlet.runRoutes(ScalatraServlet.scala:49)
    at org.scalatra.ScalatraBase$class.runActions$1(ScalatraBase.scala:163)
    at org.scalatra.ScalatraBase$$anonfun$executeRoutes$1.apply$mcV$sp(ScalatraBase.scala:175)
    at org.scalatra.ScalatraBase$$anonfun$executeRoutes$1.apply(ScalatraBase.scala:175)
    at org.scalatra.ScalatraBase$$anonfun$executeRoutes$1.apply(ScalatraBase.scala:175)
    at org.scalatra.ScalatraBase$class.org$scalatra$ScalatraBase$$cradleHalt(ScalatraBase.scala:193)
    at org.scalatra.ScalatraBase$class.executeRoutes(ScalatraBase.scala:175)
    at org.scalatra.ScalatraServlet.executeRoutes(ScalatraServlet.scala:49)
    at org.scalatra.ScalatraBase$$anonfun$handle$1.apply$mcV$sp(ScalatraBase.scala:113)
    at org.scalatra.ScalatraBase$$anonfun$handle$1.apply(ScalatraBase.scala:113)
    at org.scalatra.ScalatraBase$$anonfun$handle$1.apply(ScalatraBase.scala:113)
    at scala.util.DynamicVariable.withValue(DynamicVariable.scala:57)
    at org.scalatra.DynamicScope$class.withResponse(DynamicScope.scala:80)
    at org.scalatra.ScalatraServlet.withResponse(ScalatraServlet.scala:49)
    at org.scalatra.DynamicScope$$anonfun$withRequestResponse$1.apply(DynamicScope.scala:60)
    at scala.util.DynamicVariable.withValue(DynamicVariable.scala:57)
    at org.scalatra.DynamicScope$class.withRequest(DynamicScope.scala:71)
    at org.scalatra.ScalatraServlet.withRequest(ScalatraServlet.scala:49)
    at org.scalatra.DynamicScope$class.withRequestResponse(DynamicScope.scala:59)
    at org.scalatra.ScalatraServlet.withRequestResponse(ScalatraServlet.scala:49)
    at org.scalatra.ScalatraBase$class.handle(ScalatraBase.scala:111)
    at org.scalatra.ScalatraServlet.org$scalatra$servlet$ServletBase$$super$handle(ScalatraServlet.scala:49)
    at org.scalatra.servlet.ServletBase$class.handle(ServletBase.scala:43)
    at org.apache.livy.server.SessionServlet.org$scalatra$MethodOverride$$super$handle(SessionServlet.scala:39)
    at org.scalatra.MethodOverride$class.handle(MethodOverride.scala:28)
    at org.apache.livy.server.SessionServlet.org$scalatra$GZipSupport$$super$handle(SessionServlet.scala:39)
    at org.scalatra.GZipSupport$$anonfun$handle$1.apply$mcV$sp(GZipSupport.scala:34)
    at org.scalatra.GZipSupport$$anonfun$handle$1.apply(GZipSupport.scala:19)
    at org.scalatra.GZipSupport$$anonfun$handle$1.apply(GZipSupport.scala:19)
    at scala.util.DynamicVariable.withValue(DynamicVariable.scala:57)
    at org.scalatra.DynamicScope$class.withResponse(DynamicScope.scala:80)
    at org.scalatra.ScalatraServlet.withResponse(ScalatraServlet.scala:49)
    at org.scalatra.DynamicScope$$anonfun$withRequestResponse$1.apply(DynamicScope.scala:60)
    at scala.util.DynamicVariable.withValue(DynamicVariable.scala:57)
    at org.scalatra.DynamicScope$class.withRequest(DynamicScope.scala:71)
    at org.scalatra.ScalatraServlet.withRequest(ScalatraServlet.scala:49)
    at org.scalatra.DynamicScope$class.withRequestResponse(DynamicScope.scala:59)
    at org.scalatra.ScalatraServlet.withRequestResponse(ScalatraServlet.scala:49)
    at org.scalatra.GZipSupport$class.handle(GZipSupport.scala:18)
    at org.apache.livy.server.interactive.InteractiveSessionServlet.org$scalatra$servlet$FileUploadSupport$$super$handle(InteractiveSessionServlet.scala:40)
    at org.scalatra.servlet.FileUploadSupport$class.handle(FileUploadSupport.scala:93)
    at org.apache.livy.server.interactive.InteractiveSessionServlet.handle(InteractiveSessionServlet.scala:40)
    at org.scalatra.ScalatraServlet.service(ScalatraServlet.scala:54)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
    at org.eclipse.jetty.server.Server.handle(Server.java:499)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
    at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.ConnectException: Connection refused:
x.x.x.x.us-west-2.compute.internal/x.x.x.x:10001
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
    at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:224)
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:289)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:528)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
    ... 1 more

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