You have configured a MR cluster, but it isn't up. Run:
bin/start-mapred.sh Then check for "JobTracker" and "TaskTracker" in 'jps' output. Then re-run your example pi job, and it should go through. On Wed, May 16, 2012 at 6:51 PM, waqas latif <waqas...@gmail.com> wrote: > Hi I am trying to configure Hadoop 1.0. in pseudodistributed mode. > > But when I run the pi example given in the hadoop distribution, I get the > error mentioned in title. Can someone please help me and guide me how can I > fix this problem. Also its a request that please suggest solution as well > if possible along with pinpointing the problem. > > here is what i get by running jps > > 8322 Jps > 7611 SecondaryNameNode > 7474 DataNode > 7341 NameNode > > Here is complete error message. > > Number of Maps = 10 > Samples per Map = 100 > Wrote input for Map #0 > Wrote input for Map #1 > Wrote input for Map #2 > Wrote input for Map #3 > Wrote input for Map #4 > Wrote input for Map #5 > Wrote input for Map #6 > Wrote input for Map #7 > Wrote input for Map #8 > Wrote input for Map #9 > Starting Job > 12/05/16 13:11:56 INFO ipc.Client: Retrying connect to server: localhost/ > 127.0.0.1:8021. Already tried 0 time(s). > 12/05/16 13:11:57 INFO ipc.Client: Retrying connect to server: localhost/ > 127.0.0.1:8021. Already tried 1 time(s). > 12/05/16 13:11:58 INFO ipc.Client: Retrying connect to server: localhost/ > 127.0.0.1:8021. Already tried 2 time(s). > 12/05/16 13:11:59 INFO ipc.Client: Retrying connect to server: localhost/ > 127.0.0.1:8021. Already tried 3 time(s). > 12/05/16 13:12:00 INFO ipc.Client: Retrying connect to server: localhost/ > 127.0.0.1:8021. Already tried 4 time(s). > 12/05/16 13:12:01 INFO ipc.Client: Retrying connect to server: localhost/ > 127.0.0.1:8021. Already tried 5 time(s). > 12/05/16 13:12:02 INFO ipc.Client: Retrying connect to server: localhost/ > 127.0.0.1:8021. Already tried 6 time(s). > 12/05/16 13:12:03 INFO ipc.Client: Retrying connect to server: localhost/ > 127.0.0.1:8021. Already tried 7 time(s). > 12/05/16 13:12:04 INFO ipc.Client: Retrying connect to server: localhost/ > 127.0.0.1:8021. Already tried 8 time(s). > 12/05/16 13:12:05 INFO ipc.Client: Retrying connect to server: localhost/ > 127.0.0.1:8021. Already tried 9 time(s). > 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 -- Harsh J
