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From Arjun Reddy <arjunreddy0...@gmail.com>
Subject Problem running PI example in Hadoop 2.0.0
Date Wed, 08 Aug 2012 21:39:30 GMT
I am trying to setup a small cluster using hadoop 2.0.0 and using PI
example to validate the setup.  When I have 1 master and 1 slave the
example works fine.  I am getting exceptions with the PI example when
additional slave nodes are added to the cluster.  The syslogs for failed
tasks are as follows.  Any ideas why this is happening.

2012-08-08 15:41:19,914 WARN [main] org.apache.hadoop.conf.Configuration:
job.xml:an attempt to override final parameter:
mapreduce.job.end-notification.max.retry.interval;  Ignoring.
2012-08-08 15:41:19,915 WARN [main] org.apache.hadoop.conf.Configuration:
job.xml:an attempt to override final parameter:
mapreduce.job.end-notification.max.attempts;  Ignoring.
2012-08-08 15:41:19,973 WARN [main]
org.apache.hadoop.security.authentication.util.KerberosName: Kerberos krb5
configuration not found, setting default realm to empty
2012-08-08 15:41:20,142 INFO [main]
org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from
hadoop-metrics2.properties
2012-08-08 15:41:20,221 INFO [main]
org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot
period at 10 second(s).
2012-08-08 15:41:20,221 INFO [main]
org.apache.hadoop.metrics2.impl.MetricsSystemImpl: MapTask metrics system
started
2012-08-08 15:41:20,377 WARN [main] org.apache.hadoop.conf.Configuration:
job.xml:an attempt to override final parameter: dfs.namenode.name.dir;
Ignoring.
2012-08-08 15:41:20,378 WARN [main] org.apache.hadoop.conf.Configuration:
job.xml:an attempt to override final parameter:
mapreduce.job.end-notification.max.retry.interval;  Ignoring.
2012-08-08 15:41:20,378 WARN [main] org.apache.hadoop.conf.Configuration:
job.xml:an attempt to override final parameter: dfs.datanode.data.dir;
Ignoring.
2012-08-08 15:41:20,378 WARN [main] org.apache.hadoop.conf.Configuration:
job.xml:an attempt to override final parameter:
mapreduce.job.end-notification.max.attempts;  Ignoring.
2012-08-08 15:41:20,435 INFO [main] org.apache.hadoop.mapred.YarnChild:
Sleeping for 0ms before retrying again. Got null now.
2012-08-08 15:41:21,483 INFO [main] org.apache.hadoop.ipc.Client: Retrying
connect to server: node2/127.0.1.1:45965. Already tried 0 time(s).
2012-08-08 15:41:22,484 INFO [main] org.apache.hadoop.ipc.Client: Retrying
connect to server: node2/127.0.1.1:45965. Already tried 1 time(s).
2012-08-08 15:41:23,484 INFO [main] org.apache.hadoop.ipc.Client: Retrying
connect to server: node2/127.0.1.1:45965. Already tried 2 time(s).
2012-08-08 15:41:24,485 INFO [main] org.apache.hadoop.ipc.Client: Retrying
connect to server: node2/127.0.1.1:45965. Already tried 3 time(s).
2012-08-08 15:41:25,486 INFO [main] org.apache.hadoop.ipc.Client: Retrying
connect to server: node2/127.0.1.1:45965. Already tried 4 time(s).
2012-08-08 15:41:26,486 INFO [main] org.apache.hadoop.ipc.Client: Retrying
connect to server: node2/127.0.1.1:45965. Already tried 5 time(s).
2012-08-08 15:41:27,487 INFO [main] org.apache.hadoop.ipc.Client: Retrying
connect to server: node2/127.0.1.1:45965. Already tried 6 time(s).
2012-08-08 15:41:28,488 INFO [main] org.apache.hadoop.ipc.Client: Retrying
connect to server: node2/127.0.1.1:45965. Already tried 7 time(s).
2012-08-08 15:41:29,488 INFO [main] org.apache.hadoop.ipc.Client: Retrying
connect to server: node2/127.0.1.1:45965. Already tried 8 time(s).
2012-08-08 15:41:30,489 INFO [main] org.apache.hadoop.ipc.Client: Retrying
connect to server: node2/127.0.1.1:45965. Already tried 9 time(s).
2012-08-08 15:41:30,492 WARN [main] org.apache.hadoop.mapred.YarnChild:
Exception running child : java.net.ConnectException: Call From node2/
127.0.1.1 to node2:45965 failed on connection exception:
java.net.ConnectException: Connection refused; For more details see:
http://wiki.apache.org/hadoop/ConnectionRefused
        at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:727)
        at org.apache.hadoop.ipc.Client.call(Client.java:1165)
        at
org.apache.hadoop.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:224)
        at $Proxy6.getTask(Unknown Source)
        at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:123)
Caused by: java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:701)
        at
org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
        at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:524)
        at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:489)
        at
org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:472)
        at
org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:566)
        at
org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:215)
        at org.apache.hadoop.ipc.Client.getConnection(Client.java:1271)
        at org.apache.hadoop.ipc.Client.call(Client.java:1141)
        ... 3 more
2012-08-08 15:41:30,493 INFO [main]
org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping MapTask metrics
system...
2012-08-08 15:41:30,494 INFO [main]
org.apache.hadoop.metrics2.impl.MetricsSystemImpl: MapTask metrics system
stopped.
2012-08-08 15:41:30,494 INFO [main]
org.apache.hadoop.metrics2.impl.MetricsSystemImpl: MapTask metrics system
shutdown complete.

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