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From "Messina Alberto" <a.mess...@rai.it>
Subject Connection problems
Date Tue, 28 Oct 2008 15:40:59 GMT
Hello,

I've just installed a minimal fully distributed hadoop pool with two
servers: a master (democrito) and a slave (pascal). The master runs on
port 24000. All firewalls are down, ssh passphraseless is ok, nothing in
the hosts.allow/hosts.deny. Configuration files are the following (resp.
on the master and on the slave):

<?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>democrito:24000</value>
  </property>
  <property>
    <name>mapred.job.tracker</name>
    <value>democrito:24001</value>
  </property>
  <property>
    <name>dfs.replication</name>
    <value>2</value>
  </property>
</configuration>

<?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>hdfs://democrito:24000</value>
  </property>
  <property>
    <name>mapred.job.tracker</name>
    <value>democrito:24001</value>
  </property>
  <property>
    <name>dfs.replication</name>
    <value>2</value>
  </property>

</configuration>


I've got "connection refused " problems when the slave tries to connect
to the master in the bootstrap phase:

2008-10-28 16:18:35,228 INFO org.apache.hadoop.ipc.Client: Retrying
connect to server: democrito/10.2.6.187:24000. Already tried 0 time(s).
2008-10-28 16:18:36,231 INFO org.apache.hadoop.ipc.Client: Retrying
connect to server: democrito/10.2.6.187:24000. Already tried 1 time(s).
2008-10-28 16:18:37,233 INFO org.apache.hadoop.ipc.Client: Retrying
connect to server: democrito/10.2.6.187:24000. Already tried 2 time(s).
2008-10-28 16:18:38,235 INFO org.apache.hadoop.ipc.Client: Retrying
connect to server: democrito/10.2.6.187:24000. Already tried 3 time(s).
2008-10-28 16:18:39,238 INFO org.apache.hadoop.ipc.Client: Retrying
connect to server: democrito/10.2.6.187:24000. Already tried 4 time(s).
2008-10-28 16:18:40,241 INFO org.apache.hadoop.ipc.Client: Retrying
connect to server: democrito/10.2.6.187:24000. Already tried 5 time(s).
2008-10-28 16:18:41,244 INFO org.apache.hadoop.ipc.Client: Retrying
connect to server: democrito/10.2.6.187:24000. Already tried 6 time(s).
2008-10-28 16:18:42,246 INFO org.apache.hadoop.ipc.Client: Retrying
connect to server: democrito/10.2.6.187:24000. Already tried 7 time(s).
2008-10-28 16:18:43,248 INFO org.apache.hadoop.ipc.Client: Retrying
connect to server: democrito/10.2.6.187:24000. Already tried 8 time(s).
2008-10-28 16:18:44,250 INFO org.apache.hadoop.ipc.Client: Retrying
connect to server: democrito/10.2.6.187:24000. Already tried 9 time(s).
2008-10-28 16:18:44,254 ERROR org.apache.hadoop.dfs.DataNode:
java.io.IOException: Call failed on local exception
        at org.apache.hadoop.ipc.Client.call(Client.java:718)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)
        at org.apache.hadoop.dfs.$Proxy4.getProtocolVersion(Unknown
Source)
        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:319)
        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:306)
        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:343)
        at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:288)
        at
org.apache.hadoop.dfs.DataNode.startDataNode(DataNode.java:244)
        at org.apache.hadoop.dfs.DataNode.<init>(DataNode.java:190)
        at
org.apache.hadoop.dfs.DataNode.makeInstance(DataNode.java:2987)
        at
org.apache.hadoop.dfs.DataNode.instantiateDataNode(DataNode.java:2942)
        at
org.apache.hadoop.dfs.DataNode.createDataNode(DataNode.java:2950)
        at org.apache.hadoop.dfs.DataNode.main(DataNode.java:3072)
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 sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)
        at
org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:300)
        at
org.apache.hadoop.ipc.Client$Connection.access$1700(Client.java:177)
        at org.apache.hadoop.ipc.Client.getConnection(Client.java:789)
        at org.apache.hadoop.ipc.Client.call(Client.java:704)
        ... 12 more

Can anyone help please?


Thank you

Alberto 
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