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Call to localhost/127.0.0.1:8021 failed on connection exception: java.net.ConnectException: Connection refused
java.net.ConnectException: Call to localhost/127.0.0.1:8021 failed on connection exception: java.net.ConnectException: Connection refused at org.apache.hadoop.ipc.Client.wrapException(Client.java:1095) at org.apache.hadoop.ipc.Client.call(Client.java:1071) at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225) at org.apache.hadoop.mapred.$Proxy2.getProtocolVersion(Unknown Source) at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:396) at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:379) at org.apache.hadoop.mapred.JobClient.createRPCProxy(JobClient.java:480) at org.apache.hadoop.mapred.JobClient.init(JobClient.java:474) at org.apache.hadoop.mapred.JobClient.<init>(JobClient.java:457) at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1260) at org.apache.hadoop.examples.PiEstimator.estimate(PiEstimator.java:297) at org.apache.hadoop.examples.PiEstimator.run(PiEstimator.java:342) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65) at org.apache.hadoop.examples.PiEstimator.main(PiEstimator.java:351) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68) at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139) at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.hadoop.util.RunJar.main(RunJar.java:156)Caused by: java.net.ConnectException: Connection refused at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:701) at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206) at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:656) at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:434) at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:560) at org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:184) at org.apache.hadoop.ipc.Client.getConnection(Client.java:1202) at org.apache.hadoop.ipc.Client.call(Client.java:1046) ... 24 more