Re: Monitoring Tomcat - Delta Values

[Shanti Suresh]

Greetings Leon et al,


On Fri, May 3, 2013 at 6:36 PM, Leon Rosenberg wrote:

> Hello Shanti,
>
>
>
> yes it does:
> https://confluence.opensource.anotheria.net/display/MSK/MoSKito+Central
>
> https://confluence.opensource.anotheria.net/display/MSK/HowTo+Run+moskito-central+in+embedded+mode
>
>
> Thank you!

>
>
> every second is maybe a little overkill, but possible. What amount of
> traffic does your application serve, that you need so detailed data


Yes, per minute is okay for the most part.  I am used to 15second metrics
from some profiling tools I have at an earlier job.

My homegrown stuff gathers metrics every minute.  Many times I need to
co-relate certain events and observe what happened at a certain time on a
certain day in the past.  For e.g., Nagios might complain that it couldn't
talk to Tomcat.  Or that the load on the system was high.  If this happened
over the weekend or at night, and I am not alerted, I would like to go back
and check how the JVM and O.S.-related metrics stacked up; especially the
usual suspects.

Thanks!

   -Shanti

Re: Monitoring Tomcat - Delta Values

[Konstantin Kolinko]

2013/5/4 evernat :
> Hi Christopher and all,
>
> Since JavaMelody is quite often named to monitor Tomcat in this mailing list
> and is open-source, JavaMelody could be added in the FAQ/Monitoring wiki
> page indeed. I can send a one phrase description if you want.
>
> Or can someone add me in the ContributorsGroup of the Tomcat wiki, so that I
> am able to do it?
> My wiki username is EmericVernat
>

Added.

Best regards,
Konstantin Kolinko

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Re: Monitoring Tomcat - Delta Values

[evernat]

Hi Christopher and all,

Since JavaMelody is quite often named to monitor Tomcat in this mailing list
and is open-source, JavaMelody could be added in the FAQ/Monitoring wiki
page indeed. I can send a one phrase description if you want.

Or can someone add me in the ContributorsGroup of the Tomcat wiki, so that I
am able to do it?
My wiki username is EmericVernat

- Emeric


Darryl Lewis-2 wrote
> My choice of weapon is Melody: http://code.google.com/p/javamelody/





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Re: Monitoring Tomcat - Delta Values

[Darryl Lewis]

My choice of weapon is Melody: http://code.google.com/p/javamelody/

On 4/05/13 1:19 AM, "Christopher Schultz" 
wrote:

>-BEGIN PGP SIGNED MESSAGE-
>Hash: SHA256
>
>All,
>
>In Rainer's talk at ApacheCon [1], he mentioned a number of
>JMX-inspectable values that weren't terribly informative on their own
>(e.g. number of total requests processed by a connector) but were
>interesting when observed as deltas of their previous value.
>
>I was wondering if anyone could recommend an existing tool to capture
>that data, compute the deltas, etc. or if folks just roll their own?
>This kind of thing could be very useful to lots of users and I was
>thinking of linking to an existing tool on the FAQ/Monitoring wiki
>page or writing such a tool and posting it there (similar to the
>check_jmxproxy Perl script I put up there for use with Nagios).
>
>Ultimately, I'm thinking that it might be nice to have a single script
>that can (given some configuration) take a JMX snapshot of Tomcat
>(probably through a filter that grabs only those values of interest),
>record the values somewhere (e.g. bdb, rrd, etc.), compute deltas
>where appropriate, and then publish to a monitoring tool (e.g. Nagios).
>
>As it stands in my environments, I typically have 4-6 check_jmxproxy
>processes that all take a single sample via JMXProxyServlet on-demand
>from Nagios. Though the scripts aren't terribly CPU- or
>memory-intensive, it seems like things could be streamlined with a
>tool that can take care of multiple samples and also provide this
>additional capability.
>
>Any ideas or suggestions? I'm motivated enough to build this stuff
>myself if such a tool does not yet exist.
>
>Thanks,
>- -chris
>
>[1]
>http://archive.apachecon.com/na2013/presentations/27-Wednesday/A_Patchy_We
>b/14:45-Monitoring_Apache_Tomcat.pdf
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Re: Monitoring Tomcat - Delta Values

[Leon Rosenberg]

Hello Shanti,


On Fri, May 3, 2013 at 10:57 PM, Shanti Suresh  wrote:

>
> I am interested in trending of the metrics - so data for four months, let's
> say.
> - Does moskito have a way of storing data?
>
yes it does:
https://confluence.opensource.anotheria.net/display/MSK/MoSKito+Central
https://confluence.opensource.anotheria.net/display/MSK/HowTo+Run+moskito-central+in+embedded+mode



> - What time-interval granularity have people found useful with JMX, without
> overloading the servers?  I collect some JMX stats in 1 minute intervals,
> but really would like every second.
>

every second is maybe a little overkill, but possible. What amount of
traffic does your application serve, that you need so detailed data?

regards
Leon


>
> Thanks.
>
>   -Shanti
>

Re: Monitoring Tomcat - Delta Values

[Shanti Suresh]

>On Fri, May 3, 2013 at 12:58 PM, Rainer Jung wrote:
>On 03.05.2013 18:13, Caldarale, Charles R wrote:
>>> From: Christopher Schultz [mailto:ch...@christopherschultz.net]
>>> Subject: Monitoring Tomcat - Delta Values
>>
>>> I was wondering if anyone could recommend an existing tool to capture
>>> that data, compute the deltas, etc. or if folks just roll their own?
>>
>> I believe moskito does this already.
>>
>> http://moskito.anotheria.net/
>
>and there's Jolokia in combination with jmx4perl:
>
>http://www.jolokia.org/ 
>
> http://search.cpan.org/~roland/jmx4perl/
> http://search.cpan.org/~roland/jmx4perl/scripts/jmx4perl

On Fri, May 3, 2013 at 1:53 PM, Jess Holle  wrote:

>I meant an MBean that does the deltas and quotients itself, of course,
e.g. logging the results periodically.

I am interested in trending of the metrics - so data for four months, let's
say.
- Does moskito have a way of storing data?  With Jolokia, would you
interface with Nagios and RRDTool?
- What time-interval granularity have people found useful with JMX, without
overloading the servers?  I collect some JMX stats in 1 minute intervals,
but really would like every second.

Thanks.

  -Shanti

Re: Monitoring Tomcat - Delta Values

[Jess Holle]

On 5/3/2013 12:26 PM, Rainer Jung wrote:

On 03.05.2013 19:03, Jess Holle wrote:

On 5/3/2013 11:58 AM, Rainer Jung wrote:

Although AFAIR last time it couldn't do my favorite "quotient of
deltas", but until now I haven't found a standard tool doing that.

Average response time in last intervall = delta(cumulatedResponseTime)/
delta(RequestCount)

Tomcat provides cumulatedResponseTime and RequestCount per Servlet,
Webapp and globally, but unfortunately the tools lack for this one.

You can always add an MBean for such things -- and for cumulative CPU
time per request, cumulative time spent blocked and waiting per request,
etc, etc.

We do have the above cumulative stuff for Tomcat as MBeans. But if you
want the above statistics on a client controlled interval, the client
needs to be able to do quotient of deltas. Haven't seen any standard
client that can do that yet (they can do deltas and rates and some
quotients, but not the needed combination). So that's something one
might need to implement oneself.
I meant an MBean that does the deltas and quotients itself, of course, 
e.g. logging the results periodically.



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Re: Monitoring Tomcat - Delta Values

[Rainer Jung]

On 03.05.2013 19:03, Jess Holle wrote:
> On 5/3/2013 11:58 AM, Rainer Jung wrote:
>> Although AFAIR last time it couldn't do my favorite "quotient of
>> deltas", but until now I haven't found a standard tool doing that.
>>
>> Average response time in last intervall = delta(cumulatedResponseTime)/
>>delta(RequestCount)
>>
>> Tomcat provides cumulatedResponseTime and RequestCount per Servlet,
>> Webapp and globally, but unfortunately the tools lack for this one.
> You can always add an MBean for such things -- and for cumulative CPU
> time per request, cumulative time spent blocked and waiting per request,
> etc, etc.

We do have the above cumulative stuff for Tomcat as MBeans. But if you
want the above statistics on a client controlled interval, the client
needs to be able to do quotient of deltas. Haven't seen any standard
client that can do that yet (they can do deltas and rates and some
quotients, but not the needed combination). So that's something one
might need to implement oneself.

Regards,

Rainer



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Re: Monitoring Tomcat - Delta Values

[Jess Holle]

On 5/3/2013 11:58 AM, Rainer Jung wrote:

Although AFAIR last time it couldn't do my favorite "quotient of
deltas", but until now I haven't found a standard tool doing that.

Average response time in last intervall = delta(cumulatedResponseTime)/
   delta(RequestCount)

Tomcat provides cumulatedResponseTime and RequestCount per Servlet,
Webapp and globally, but unfortunately the tools lack for this one.
You can always add an MBean for such things -- and for cumulative CPU 
time per request, cumulative time spent blocked and waiting per request, 
etc, etc.


[Been there done that.]


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Re: Monitoring Tomcat - Delta Values

[Rainer Jung]

On 03.05.2013 18:13, Caldarale, Charles R wrote:
>> From: Christopher Schultz [mailto:ch...@christopherschultz.net] 
>> Subject: Monitoring Tomcat - Delta Values
> 
>> I was wondering if anyone could recommend an existing tool to capture
>> that data, compute the deltas, etc. or if folks just roll their own?
> 
> I believe moskito does this already.
> 
> http://moskito.anotheria.net/

and there's Jolokia in combination with jmx4perl:

http://www.jolokia.org/

http://search.cpan.org/~roland/jmx4perl/
http://search.cpan.org/~roland/jmx4perl/scripts/jmx4perl

which fits nicely together with nagios.

Although AFAIR last time it couldn't do my favorite "quotient of
deltas", but until now I haven't found a standard tool doing that.

Average response time in last intervall = delta(cumulatedResponseTime)/
  delta(RequestCount)

Tomcat provides cumulatedResponseTime and RequestCount per Servlet,
Webapp and globally, but unfortunately the tools lack for this one.

Regards,

Rainer


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RE: Monitoring Tomcat - Delta Values

[Caldarale, Charles R]

> From: Christopher Schultz [mailto:ch...@christopherschultz.net] 
> Subject: Monitoring Tomcat - Delta Values

> I was wondering if anyone could recommend an existing tool to capture
> that data, compute the deltas, etc. or if folks just roll their own?

I believe moskito does this already.

http://moskito.anotheria.net/

 - Chuck


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