Monitoring pools

[Legacy User]

Hi all,

I'm trying to use Wily to add some monitoring to commons-httpclient. In particular, I want to know the maximum number of threads waiting for a connection and how long they're waiting. While it might not be possible to monitor the actual time spent waiting, I've hacked up a pair of incrementors and decrementors that attempt to track the number of threads in the "doGetConnection" method. The number that gets reported to Wily, however, is always 0, I think because at the end of the interval, if no threads are in that method at that moment, the count is 0. What I really want is a high-water mark per interval. Is such a thing possible?

thanks

[System]

Hi All,

Any input here for John? You may want to also check in with Support as well.

Thanks!
Chris

[Legacy User]

I switched to using a single BlamePointTracer. While it doesn't exactly give the high-water mark behavior that I wanted, it works well enough and allows me to correlate responses per interval with response time.

thanks

[Haruhiko Davis]

There are a number of different tracers that can used besides BlamePointTracer.
I'm attaching the currently supported tracers.

If you can expose JMX, there is an MBean that will give you the high water metric you're looking for.

-Hiko

Attachment(s)

Directive Tracer Type and Metric Data Type Definitions.pdf   343 KB 1 version

[Legacy User]

Thanks Hiko.

I'm familiar with that document. Do you think there is another tracer that would make more sense? The combination of responses, concurrent requests, and response time is nice.

What is the name of the mbean that will give me the high-water mark? Is there some documentation I should look at?

thanks

[Haruhiko Davis]

John,
What does your application tiers consist of (web server, app server, etc)?

[Haruhiko Davis]

John,
The high water mark metric is called WebAppComponentRuntimeMBean|OpenSessionsHighCount. You can see the documentation online at Oracle's MBean Reference site (http://download.oracle.com/docs/cd/E11035_01/wls100/wlsmbeanref/core/index.html).

I hope this is what you're looking for.

Sorry for the long delay; I really should keep up with my posts!

-Hiko

[WarrenPage]

I user the following to monitor HTTP Commons calls

TraceOneMethodOfClass: org.apache.commons.httpclient.HttpClient executeMethod BackendMarker "ORM|HTTPCall|{classname}|{method}"