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From Eli Finkelshteyn <iefin...@gmail.com>
Subject Re: Netstat Shows Port 8020 Doesn't Seem to Listen
Date Mon, 09 Jan 2012 18:58:07 GMT
More info:

In the DataNode log, I'm also seeing:

2012-01-09 13:06:27,751 INFO org.apache.hadoop.ipc.Client: Retrying 
connect to server: localhost/127.0.0.1:8020. Already tried 9 time(s).

Why would things just not load on port 8020? I feel like all the errors 
I'm seeing are caused by this, but I can't see any errors about why this 
occurred in the first place.


On 1/9/12 1:14 PM, Eli Finkelshteyn wrote:
> Hi,
> I've been googling, but haven't been able to find an answer. I'm 
> currently trying to setup Hadoop in pseudo-distributed mode as a first 
> step. I'm using the Cloudera distro and installed everything through 
> YUM on CentOS 5.7. I can run everything just fine from my one node 
> itself (hadoop fs -ls /, test map-red jobs, etc...), but can't get a 
> remote client to be able to connect to it. I'm pretty sure the cause 
> of that has to do with the fact that port 8020 and port 8021 do not 
> seem to be listening (when I do a netstat -a, they don't show up-- all 
> the other Hadoop related ports like 50030 and 50070 do show up). I 
> verified that the firewall allows connections over 8020 and 8021 for 
> tcp, and can connect through my web browser to 50030 and 50070.
>
> Looking at the namenode log, I see the following error which looks 
> suspicious and related to me:
>
>     2012-01-09 12:03:38,000 INFO org.apache.hadoop.ipc.Server: IPC
>     Server listener on 8020: starting
>     2012-01-09 12:03:38,009 INFO org.apache.hadoop.ipc.Server: IPC
>     Server handler 0 on 8020: starting
>     2012-01-09 12:03:39,187 INFO org.apache.hadoop.ipc.Server: IPC
>     Server handler 2 on 8020: starting
>     2012-01-09 12:03:39,188 INFO org.apache.hadoop.ipc.Server: IPC
>     Server handler 3 on 8020: starting
>     2012-01-09 12:03:39,188 INFO org.apache.hadoop.ipc.Server: IPC
>     Server handler 4 on 8020: starting
>     2012-01-09 12:03:39,188 INFO org.apache.hadoop.ipc.Server: IPC
>     Server handler 5 on 8020: starting
>     2012-01-09 12:03:39,188 INFO org.apache.hadoop.ipc.Server: IPC
>     Server handler 6 on 8020: starting
>     2012-01-09 12:03:39,189 INFO org.apache.hadoop.ipc.Server: IPC
>     Server handler 1 on 8020: starting
>     2012-01-09 12:03:39,189 INFO org.apache.hadoop.ipc.Server: IPC
>     Server handler 7 on 8020: starting
>     2012-01-09 12:03:39,189 INFO org.apache.hadoop.ipc.Server: IPC
>     Server handler 8 on 8020: starting
>     2012-01-09 12:03:39,246 INFO org.apache.hadoop.ipc.Server: IPC
>     Server handler 9 on 8020: starting
>     2012-01-09 12:03:39,258 WARN
>     org.apache.hadoop.util.PluginDispatcher: Unable to load
>     dfs.namenode.plugins plugins
>     2012-01-09 12:03:40,254 INFO org.apache.hadoop.ipc.Server: IPC
>     Server handler 8 on 8020, call
>     addBlock(/var/lib/hadoop-0.20/cache/mapred/mapred/system/jobtracker.info,
>     DFSClient_-1779116177, null) from 127.0.0.1:39785: error:
>     java.io.IOException: File
>     /var/lib/hadoop-0.20/cache/mapred/mapred/system/jobtracker.info
>     could only be replicated to 0 nodes, instead of 1
>
> Anyone have any idea what my problem might be?
>
> Cheers,
> Eli


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