While running a wordcount program i am getting the following error. cloudera@localhost ~]$ hadoop jar WordCount.jar WordCount /inputnew2/inputfile.txt /output_new 18/06/09 00:29:06 INFO ipc.Client: Retrying connect to server: localhost.localdomain/127.0.0.1:8021. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 18/06/09 00:29:07 INFO ipc.Client: Retrying connect to server: localhost.localdomain/127.0.0.1:8021. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 18/06/09 00:29:08 INFO ipc.Client: Retrying connect to server: localhost.localdomain/127.0.0.1:8021. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 18/06/09 00:29:09 INFO ipc.Client: Retrying connect to server: localhost.localdomain/127.0.0.1:8021. Already tried 3 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 18/06/09 00:29:10 INFO ipc.Client: Retrying connect to server: localhost.localdomain/127.0.0.1:8021. Already tried 4 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 18/06/09 00:29:11 INFO ipc.Client: Retrying connect to server: localhost.localdomain/127.0.0.1:8021. Already tried 5 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 18/06/09 00:29:12 INFO ipc.Client: Retrying connect to server: localhost.localdomain/127.0.0.1:8021. Already tried 6 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 18/06/09 00:29:13 INFO ipc.Client: Retrying connect to server: localhost.localdomain/127.0.0.1:8021. Already tried 7 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 18/06/09 00:29:14 INFO ipc.Client: Retrying connect to server: localhost.localdomain/127.0.0.1:8021. Already tried 8 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 18/06/09 00:29:15 INFO ipc.Client: Retrying connect to server: localhost.localdomain/127.0.0.1:8021. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 18/06/09 00:29:15 ERROR security.UserGroupInformation: PriviledgedActionException as:cloudera (auth:SIMPLE) cause:java.net.ConnectException: Call From localhost.localdomain/127.0.0.1 to localhost.localdomain:8021 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused Exception in thread "main" java.net.ConnectException: Call From localhost.localdomain/127.0.0.1 to localhost.localdomain:8021 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:39)           at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)           at java.lang.reflect.Constructor.newInstance(Constructor.java:513)           at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:782)           at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:729)           at org.apache.hadoop.ipc.Client.call(Client.java:1241)           at org.apache.hadoop.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:225)           at org.apache.hadoop.mapred.$Proxy10.getStagingAreaDir(Unknown Source)           at org.apache.hadoop.mapred.JobClient.getStagingAreaDir(JobClient.java:1324)           at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:102)           at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:951)           at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:945)           at java.security.AccessController.doPrivileged(Native Method)           at javax.security.auth.Subject.doAs(Subject.java:396)           at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1408)           at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:945)           at org.apache.hadoop.mapreduce.Job.submit(Job.java:566)           at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:596)           at WordCount.main(WordCount.java:132)           at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)           at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)           at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)           at java.lang.reflect.Method.invoke(Method.java:597)           at org.apache.hadoop.util.RunJar.main(RunJar.java:208) Caused by: java.net.ConnectException: Connection refused           at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)           at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:599)           at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:207)           at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:528)           at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:492)           at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:509)           at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:603)           at org.apache.hadoop.ipc.Client$Connection.access$2100(Client.java:252)           at org.apache.hadoop.ipc.Client.getConnection(Client.java:1290)           at org.apache.hadoop.ipc.Client.call(Client.java:1208)           ... 18 more ... 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sir thank you very much,its working ... View more