Re: Beginner to Hadoop, please help

Wed, 23 May 2007 13:06:16 -0700

That's normal. That's just a test of RPC's ability to throw exceptions. I think this has confused others in the past, so perhaps we should either (a) add a log message that explains this and/or (b) change "bobo" to something like "RPC Exception Test -- please ignore". 

Doug

yu-yang chen wrote:

Hello, after change the domain name, it still fails.

I just realise something:

when i run :
camelot01% bin/hadoop jar hadoop-0.12.3-test.jar testrpc

it fails and return:

07/05/23 20:56:25 INFO ipc.Server: IPC Server listener on 1234: starting
07/05/23 20:56:25 INFO ipc.Server: IPC Server handler 0 on 1234: starting
07/05/23 20:56:25 INFO ipc.Server: IPC Server handler 0 on 1234 call error: java.io.IOException: bobo 
java.io.IOException: bobo
       at org.apache.hadoop.ipc.TestRPC$TestImpl.error(TestRPC.java:90)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
       at java.lang.reflect.Method.invoke(Method.java:585)
       at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:336)
       at org.apache.hadoop.ipc.Server$Handler.run(Server.java:559)
07/05/23 20:56:25 INFO ipc.Server: Stopping server on 1234
07/05/23 20:56:25 INFO ipc.Server: Stopping IPC Server listener on 1234



what is the bobo Exception? and how to fix it?

thank you for replying!!

yu-yang



Michael Bieniosek wrote:

Try using fully-qualified domain names in your xml file.

On 5/23/07 11:22 AM, "yu-yang chen" <[EMAIL PROTECTED]> wrote:


I know this question pop up so mant times, but I couldn't find a right
answer to my case....

hello everyone, i just started to use hadoop and encountered problem on
setting up the single node system:


This is what inside my hadoop-site.xml:
------------------------------------------------------------------------------ 
------
camelot01% cat hadoop-site.xml


<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>
        <property>
                <name>fs.default.name</name>
                <value>localhost:9000</value>
        </property>
        <property>
                <name>mapred.job.tracker</name>
                <value>localhost:9001</value>
        </property>
        <property>
                <name>dfs.replication</name>
                <value>1</value>
        </property>
</configuration>
------------------------------------------------------------------------------ 
-------

After:

bin/hadoop namenode -format
Re-format filesystem in /tmp/hadoop-yyc04/dfs/name ? (Y or N) Y
Formatted /tmp/hadoop-yyc04/dfs/name

camelot01% bin/start-all.sh<---works fine, passwrdless ssh also works


And this is the error i obtain:


camelot01% bin/hadoop jar hadoop-0.12.3-examples.jar pi 10 20

Number of Maps = 10 Samples per Map = 20
07/05/23 19:14:11 INFO ipc.Client: Retrying connect to server:
localhost/146.169.2.131:9000. Already tried 1 time(s).
07/05/23 19:14:12 INFO ipc.Client: Retrying connect to server:
localhost/146.169.2.131:9000. Already tried 2 time(s).
07/05/23 19:14:13 INFO ipc.Client: Retrying connect to server:
localhost/146.169.2.131:9000. Already tried 3 time(s).
07/05/23 19:14:14 INFO ipc.Client: Retrying connect to server:
localhost/146.169.2.131:9000. Already tried 4 time(s).
07/05/23 19:14:15 INFO ipc.Client: Retrying connect to server:
localhost/146.169.2.131:9000. Already tried 5 time(s).
07/05/23 19:14:16 INFO ipc.Client: Retrying connect to server:
localhost/146.169.2.131:9000. Already tried 6 time(s).
07/05/23 19:14:17 INFO ipc.Client: Retrying connect to server:
localhost/146.169.2.131:9000. Already tried 7 time(s).
07/05/23 19:14:18 INFO ipc.Client: Retrying connect to server:
localhost/146.169.2.131:9000. Already tried 8 time(s).
07/05/23 19:14:19 INFO ipc.Client: Retrying connect to server:
localhost/146.169.2.131:9000. Already tried 9 time(s).
07/05/23 19:14:20 INFO ipc.Client: Retrying connect to server:
localhost/146.169.2.131:9000. Already tried 10 time(s).
java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195) 
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:364)
        at java.net.Socket.connect(Socket.java:507)
at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:149) 
        at org.apache.hadoop.ipc.Client.getConnection(Client.java:529)
        at org.apache.hadoop.ipc.Client.call(Client.java:458)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:163)
at org.apache.hadoop.dfs.$Proxy0.getProtocolVersion(Unknown Source) 
        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:247)
        at org.apache.hadoop.dfs.DFSClient.<init>(DFSClient.java:105)
at org.apache.hadoop.dfs.DistributedFileSystem$RawDistributedFileSystem.initializ 
e(DistributedFileSystem.java:67)
at org.apache.hadoop.fs.FilterFileSystem.initialize(FilterFileSystem.java:57) 
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:160)
        at org.apache.hadoop.fs.FileSystem.getNamed(FileSystem.java:119)
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:91)
at org.apache.hadoop.examples.PiEstimator.launch(PiEstimator.java:169) at org.apache.hadoop.examples.PiEstimator.main(PiEstimator.java:226) 
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.j 
ava:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.j 
ava:71)
at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:143) at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:40) 
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.j 
ava:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:155)





can anyone please tell me why? I did not change any other files apart
from hadoop-env.xml (set JAVA_HOME) and hadoop-site.xml



please help....thank you so much!

yu-yang

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