Or....
3) The configuration (or lack thereof) on the machine you are trying to
run this, has no idea where your DFS or JobTracker is :)
Cheers
James.
On 2010-12-30, at 8:53 PM, Adarsh Sharma wrote:
> Cavus,M.,Fa. Post Direkt wrote:
>> I process this
>>
>> ./hadoop jar ../../hadoopjar/hd.jar org.postdirekt.hadoop.WordCount
>> gutenberg gutenberg-output
>>
>> I get this
>> Dıd anyone know why I get this Error?
>>
>> 10/12/30 16:48:59 INFO security.Groups: Group mapping
>> impl=org.apache.hadoop.security.ShellBasedUnixGroupsMapping;
>> cacheTimeout=300000
>> 10/12/30 16:49:01 INFO ipc.Client: Retrying connect to server:
>> localhost/127.0.0.1:9001. Already tried 0 time(s).
>> 10/12/30 16:49:02 INFO ipc.Client: Retrying connect to server:
>> localhost/127.0.0.1:9001. Already tried 1 time(s).
>> 10/12/30 16:49:03 INFO ipc.Client: Retrying connect to server:
>> localhost/127.0.0.1:9001. Already tried 2 time(s).
>> 10/12/30 16:49:04 INFO ipc.Client: Retrying connect to server:
>> localhost/127.0.0.1:9001. Already tried 3 time(s).
>> 10/12/30 16:49:05 INFO ipc.Client: Retrying connect to server:
>> localhost/127.0.0.1:9001. Already tried 4 time(s).
>> 10/12/30 16:49:06 INFO ipc.Client: Retrying connect to server:
>> localhost/127.0.0.1:9001. Already tried 5 time(s).
>> 10/12/30 16:49:07 INFO ipc.Client: Retrying connect to server:
>> localhost/127.0.0.1:9001. Already tried 6 time(s).
>> 10/12/30 16:49:08 INFO ipc.Client: Retrying connect to server:
>> localhost/127.0.0.1:9001. Already tried 7 time(s).
>> 10/12/30 16:49:09 INFO ipc.Client: Retrying connect to server:
>> localhost/127.0.0.1:9001. Already tried 8 time(s).
>> 10/12/30 16:49:10 INFO ipc.Client: Retrying connect to server:
>> localhost/127.0.0.1:9001. Already tried 9 time(s).
>> Exception in thread "main" java.net.ConnectException: Call to
>> localhost/127.0.0.1:9001 failed on connection exception:
>> java.net.ConnectException: Connection refused
>> at org.apache.hadoop.ipc.Client.wrapException(Client.java:932)
>> at org.apache.hadoop.ipc.Client.call(Client.java:908)
>> at
>> org.apache.hadoop.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:198)
>> at $Proxy0.getProtocolVersion(Unknown Source)
>> at
>> org.apache.hadoop.ipc.WritableRpcEngine.getProxy(WritableRpcEngine.java:228)
>> at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:224)
>> at org.apache.hadoop.mapreduce.Cluster.createRPCProxy(Cluster.java:82)
>> at org.apache.hadoop.mapreduce.Cluster.createClient(Cluster.java:94)
>> at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:70)
>> at org.apache.hadoop.mapreduce.Job.<init>(Job.java:129)
>> at org.apache.hadoop.mapreduce.Job.<init>(Job.java:134)
>> at org.postdirekt.hadoop.WordCount.main(WordCount.java:19)
>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> at
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>> at
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>> at java.lang.reflect.Method.invoke(Method.java:597)
>> at org.apache.hadoop.util.RunJar.main(RunJar.java:192)
>> Caused by: java.net.ConnectException: Connection refused
>> at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>> at
>> sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574)
>> at
>> org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
>> at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:373)
>> at
>> org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:417)
>> at org.apache.hadoop.ipc.Client$Connection.access$1900(Client.java:207)
>> at org.apache.hadoop.ipc.Client.getConnection(Client.java:1025)
>> at org.apache.hadoop.ipc.Client.call(Client.java:885)
>> ... 15 more
>>
> This is the most common issue occured after configuring Hadoop Cluster.
>
> Reason :
>
> 1. Your NameNode, JobTracker is not running. Verify through Web UI and jps
> commands.
> 2. DNS Resolution. You must have IP hostname enteries if all nodes in
> /etc/hosts file.
>
>
>
> Best Regards
>
> Adarsh Sharma
