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From Supun Kamburugamuva <>
Subject Re: GSOC: Monitor improvements - draft proposal
Date Tue, 30 Apr 2013 14:31:43 GMT
Hi Josh,

Thanks for the detailed feedback. I've integrated your suggestions to the

For a third party monitoring tool I would like to use Zabbix. But I may
have to do more research on this one. For now I'll leave it with Zabbix.

I couldn't find a library that helps with JMX development. I guess most
people use the Java API directly. Anyways I'll do more research on this one
and try to find one if possible.

Thanks for the Javascrip library suggestions. d3.js seems impressive.

I've updated the timeline and added a deliverable section. Hope this helps
a bit. Let me know if it needs further improvements. For each phase my plan
is to create a patch with the changes.


On Mon, Apr 29, 2013 at 10:26 PM, Josh Elser <> wrote:

> Supun,
> Thanks for the draft! Some feedback -- hopefully it's useful for your
> proposal in addition to giving you a better understanding of how Accumulo
> is typically run.
> "These servers perform different functionalities"
> Actually, most serversin an Accumulo cluster are identical to one another:
> most are running a TabletServer, and in <1.5, a Logger. The exceptions are
> the Master, Monitor, Tracer and GarbageCollector. Master, monitor and gc
> are typically run on the same node (monitor and gc are rather lightweight).
> Running a tracer on every TabletServer is probably overkill, but, again,
> this is another lightweight process, so not outside the realm of
> possibilities.
> "Create a JMX API for Monitor to gather statistics"
> Any plans to include an example 3rd-party monitor that takes advantage of
> the internal change from Thrift to JMX? If so, which? I could see this
> being very useful for your own verification and validation, not to mention
> for 3rd parties (people other than yourself).
> "Table Graphs"
> I'd be rather interested to see how the amount of data being returned by a
> TabletServer correlates with query rate. It would be a neat plot to see how
> RFile index size and size of each key-value returned corresponds with query
> rate. Maybe it would be cool to have the ability to let users create
> composite graphs?
> "Trace Visualization"
> Not a lot to really see here. Currently you get some rudimentary
> information about how long it took to determine which files to delete, and
> how long deleting them took (I think). It would be nice to see this broken
> down by table, and include file size and other file metadata.
> "Server Status Information"
> I remember hearing that someone had done some work to actually pop a shell
> in the monitor when authenticated over HTTPS. Another cool feature might be
> to actually have some greater insight into a node (perhaps using JMX calls
> that we wouldn't want publicly available) when properly authenticated? I'm
> thinking about being able to view the list of running scans on a node...
> being able to introspect the actual scan options/data, ranges being run,
> etc.
> "Mock Stats Collector"
> I would put money that this will pay off in spades as you move forward
> testing things.
> Some more high-level things...
> * Any thought/preference on the JMX library you would want to use?
> * Re: Javascript, might want to look at DataTables (jQuery-based), d3.js,
> and/or nvd3. Lots of options here, but licensing can be a concern. Glad you
> thought about that already.
> "Deliverables and Timeline"
> I'd try to rethink your timeline a bit; it comes off very waterfall-y to
> me. The biggest red-flag to me is the "write documentation" as your last
> phase. Coming from experience, this doesn't work 95% of the time. Something
> else always comes up, takes longer, w/e and suddenly you have some code
> that you just got working and no documentation. I know it's difficult to
> create a development schedule when you're not completely familiar with what
> will be required of you, but trying to lay out the work in such a way that
> you have some concrete, measurable results after each phase will help you
> and, I believe, make a much more realistic schedule (not to mention make
> the advisor's job easier to see progress :P).
> I hope this helps in one way or another.
> - Josh
> On 4/29/2013 10:46 AM, Supun Kamburugamuva wrote:
> > Hi all,
> >
> > Here is the draft proposal for the Monitor Improvements project.
> >
> >**document/d/**1j1YHZJXuzxIrB1udt1RnWZUgZLeo-**
> JX711gEv1l--r8/edit#heading=h.**2r66wv56fsz<>
> >
> > I would really appreciate your feedback.
> >
> > Cheers,
> > Supun..
> >

Supun Kamburugamuva
Member, Apache Software Foundation;
E-mail:;  Mobile: +1 812 369 6762

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