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Erik Krogen commented on HDFS-15032: ------------------------------------ You'll get an exception like: {code} 19/12/04 18:17:44 ERROR balancer.Balancer: Exiting balancer due an exception java.lang.reflect.UndeclaredThrowableException at com.sun.proxy.$Proxy4.getHAServiceState(Unknown Source) at org.apache.hadoop.hdfs.server.namenode.ha.ObserverReadProxyProvider.getHAServiceState(ObserverReadProxyProvider.java:276) at org.apache.hadoop.hdfs.server.namenode.ha.ObserverReadProxyProvider.changeProxy(ObserverReadProxyProvider.java:262) at org.apache.hadoop.hdfs.server.namenode.ha.ObserverReadProxyProvider.access$900(ObserverReadProxyProvider.java:69) at org.apache.hadoop.hdfs.server.namenode.ha.ObserverReadProxyProvider$ObserverReadInvocationHandler.invoke(ObserverReadProxyProvider.java:399) at com.sun.proxy.$Proxy4.getDatanodeStorageReport(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:422) at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:165) at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:157) at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:359) at com.sun.proxy.$Proxy4.getDatanodeStorageReport(Unknown Source) at org.apache.hadoop.hdfs.server.balancer.NameNodeConnector.getLiveDatanodeStorageReport(NameNodeConnector.java:198) at org.apache.hadoop.hdfs.server.balancer.Dispatcher.init(Dispatcher.java:1001) at org.apache.hadoop.hdfs.server.balancer.Balancer.runOneIteration(Balancer.java:602) at org.apache.hadoop.hdfs.server.balancer.Balancer.run(Balancer.java:696) at org.apache.hadoop.hdfs.server.balancer.Balancer$Cli.run(Balancer.java:775) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76) at org.apache.hadoop.hdfs.server.balancer.Balancer.main(Balancer.java:918) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.ipc.ProxyCombiner$CombinedProxyInvocationHandler.invoke(ProxyCombiner.java:97) ... 23 more Caused by: java.net.ConnectException: Call From <SOURCE> to <DESTINATION_NAMENODE> failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:824) at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:754) at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1544) at org.apache.hadoop.ipc.Client.call(Client.java:1486) at org.apache.hadoop.ipc.Client.call(Client.java:1385) at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:232) at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:118) at com.sun.proxy.$Proxy15.getHAServiceState(Unknown Source) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getHAServiceState(ClientNamenodeProtocolTranslatorPB.java:1630) ... 28 more Caused by: java.net.ConnectException: Connection refused at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206) at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:531) at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:701) at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:805) at org.apache.hadoop.ipc.Client$Connection.access$3700(Client.java:423) at org.apache.hadoop.ipc.Client.getConnection(Client.java:1601) at org.apache.hadoop.ipc.Client.call(Client.java:1432) ... 33 more {code} > Balancer crashes when it fails to contact an NN via ObserverReadProxyProvider > ----------------------------------------------------------------------------- > > Key: HDFS-15032 > URL: https://issues.apache.org/jira/browse/HDFS-15032 > Project: Hadoop HDFS > Issue Type: Bug > Components: balancer & mover > Affects Versions: 2.10.0 > Reporter: Erik Krogen > Assignee: Erik Krogen > Priority: Major > > When trying to run the Balancer using ObserverReadProxyProvider (to allow it > to read from the Observer Node as described in HDFS-14979), if one of the NNs > isn't running, the Balancer will crash. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org