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From Anthony Molinaro <antho...@alumni.caltech.edu>
Subject Re: admin web UI
Date Tue, 04 May 2010 17:49:09 GMT
And just to show you what the dashboards look like here's a couple
of screen shots

Jconsole like page of jvm stats
http://herbie.ddv.com/~anthonym/mondemand-2.png

Cassandra specific memtable stats
http://herbie.ddv.com/~anthonym/mondemand-1.png

-Anthony

On Tue, May 04, 2010 at 10:03:52AM -0700, Michael Lum wrote:
> On 5/4/2010 7:21 AM, Eric Evans wrote:
> >On Tue, 2010-05-04 at 08:41 +0300, Ran Tavory wrote:
> >>How about the following compromise:
> >>Add a simple web server to each node with only one simple servlet that
> >>simply spits out all JMX stats on one page. Not fancy, no graphs,
> >>simply the same values you can get from jconsole, but on a web page.
> >>To me it seems like a fair tradeoff b/w maintenance and easier out of
> >>the box management.  Shooting up jconsole for each server is
> >>cumbersome, at least in the environment I work in (firewalls, high
> >>latency etc) so a web interface can be nice.
> >
> >It still seems superfluous to me, but I'd be open to something
> >fire-and-forget (i.e. wouldn't need updating each time something new was
> >added).
> 
> This is how we monitor our Cassandra clusters.  Each Cassandra node runs 
> a process that polls the JMX stats and then fires off events to a set of 
> configured management nodes using either UDP or multicast, depending on 
> the network.  New Cassandra nodes in the same cluster and datacenter 
> have the same config (and are configured centrally anyways), and the 
> management nodes automatically add new nodes based on the events they 
> receive, so all the graphs, dashboards, monitors, and downstream tools 
> pick all of this up without needing a change.  This way we don't need to 
> fire up jconsole for hundreds of nodes and can do other interesting 
> cluster-wide aggregations.  Also, we don't have to remember to setup 
> monitoring when the cluster grows.
> 
> All the tools used are open source, and I'd be happy to share more 
> detail if there is interest.

-- 
------------------------------------------------------------------------
Anthony Molinaro                           <anthonym@alumni.caltech.edu>

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