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From Pablo Cuadrado <>
Subject Re: admin web UI
Date Tue, 04 May 2010 17:55:35 GMT
Anthony, very nice to see this, this is exactly the kind of thing I've
started on a web UI!

I'll try to get more things done this week and post it somewhere for
those who are interested.

On Tue, May 4, 2010 at 2:49 PM, Anthony Molinaro
<> wrote:
> And just to show you what the dashboards look like here's a couple
> of screen shots
> Jconsole like page of jvm stats
> Cassandra specific memtable stats
> -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                           <>

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