I'm curious about the relationship between the namenode/job/task trackers and the machine's web server?  Do the former require the latter?  Does successful connection to the trackers imply that the machine has a web server up and running?  I realize the ports are totally different (web is generally port 80), but the trackers are headed with the "http" URI, so I'm a little unsure if that means anything w.r.t. my question.  Can you run and access the trackers on a machine that doesn't have a webserver installed or running?

I know, it's a weird question.  Thanks for any quick response.

Thanks.

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Keith Wiley     [EMAIL PROTECTED]     keithwiley.com    music.keithwiley.com

"The easy confidence with which I know another man's religion is folly teaches
me to suspect that my own is also."
                                           --  Mark Twain
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Hi Keith:

On Fri, Jul 20, 2012 at 3:28 PM, Keith Wiley <[EMAIL PROTECTED]> wrote:

> I'm curious about the relationship between the namenode/job/task trackers
> and the machine's web server?  Do the former require the latter?
The hadoop daemons embed a jetty instance to serve their user interfaces
over http.
You will see the jetty instance come online in your logs with lines like
this:

2012-07-20 22:55:14,519 INFO org.apache.hadoop.http.HttpServer: Port
returned by webServer.getConnectors()[0].getLocalPort() before open() is
-1. Opening the listener on 50060
2012-07-20 22:55:14,519 INFO org.apache.hadoop.http.HttpServer:
listener.getLocalPort() returned 50060
webServer.getConnectors()[0].getLocalPort() before open() is -1. Opening
the listener on 50060
2012-07-20 22:55:14,519 INFO org.apache.hadoop.http.HttpServer:
listener.getLocalPort() returned 50060
webServer.getConnectors()[0].getLocalPort() returned 50060
2012-07-20 22:55:14,519 INFO org.apache.hadoop.http.HttpServer: Jetty bound
to port 50060

Does successful connection to the trackers imply that the machine has a web
> server up and running?
A tasktracker that is "up" should have it's web interface served by it's
embedded jetty instance.
> I realize the ports are totally different (web is generally port 80), but
> the trackers are headed with the "http" URI, so I'm a little unsure if that
> means anything w.r.t. my question.  Can you run and access the trackers on
> a machine that doesn't have a webserver installed or running?
>
>
The hadoop daemons do not require a web server to be running on any grid
nodes.
> I know, it's a weird question.  Thanks for any quick response.
>
>
HTH

Regards,
Al

I don't like to clutter up with list with simple "thanks" responses...so, thanks.

Cheers!

________________________________________________________________________________
Keith Wiley     [EMAIL PROTECTED]     keithwiley.com    music.keithwiley.com

"I used to be with it, but then they changed what it was.  Now, what I'm with
isn't it, and what's it seems weird and scary to me."
                                           --  Abe (Grandpa) Simpson
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