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From Time Less <timelessn...@gmail.com>
Subject Re: JMX Monitoring of DataNode?
Date Tue, 25 Oct 2011 23:35:06 GMT
In case anyone's interested, here's a bit more detail:

If I try to use JConsole to connect to $DataNodeIP:8000 (on which nothing is
listening,) I get this:
"Connection Failed: Connection Refused"

However, if I try to connect to the DataNode, which is listening on the port
8010 on $DataNodeIP, (netstat and ps both corroborate), I get this alternate
"Connection Failed: Retry?
 The connection to $DataNodeIP:8010 did not succeed. Would you like to try

If I try to use VisualVM to connect to $DataNodeIP:8010, I get this:
"Cannot connect to $DataNodeIP:8010 using service: jmx:rmi:///jndi/rmi://"

If I connect to $NameNodeIP:8010, the JMX connection works, and I can see
stats and graph them, etc, as expected.

I find zero mentions of anyone having problems with DataNode monitoring via
JMX on the Googlewebs, so I guess at this point I wonder if anyone can
explicitly say they are collecting JMX stats from their DataNodes, and if
so, what distribution/versions they're running?

On Mon, Oct 24, 2011 at 5:29 PM, Time Less <timelessness@gmail.com> wrote:

> I setup JMX monitoring of the NameNode, and it worked fine. Tried to do the
> same for the DataNode, and it fails.
> The datanode listens on the port I specify, but VisualVM can't connect (I'm
> specifying no user/password/SSL).
> For troubleshooting purposes, I'm totally willing to try different tools
> than VisualVM, so if anyone knows some tool that works particularly well,
> I'd love to hear it.
> --
> Tim Ellis
> Data Architect, Riot Games


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