Jan Bartel wrote:
Aaron,
The package to look at with viewCVS at sourceforge is here:
http://cvs.sourceforge.net/viewcvs.py/jetty/Jetty/extra/jsr77/src/org/mortbay/jetty/servlet/jsr77/
The JSR77 stuff is instrumented by inserting an o.m.j.s.jsr77.Jsr77Filter
in front of each servlet defined for a webapp. This filter collects
the JSR77 servlet statistics. The stats are exposed to JMX via the
o.m.j.s.jsr77.jmx.Jsr77ServletHolderMBean at the objectname expected
by the spec. The mbean interrogates the filter instance to get the
stats.
To turn on JSR77 for Jetty, you:
1) add these lines to the jetty.xml config file:
<Set name="WebApplicationConfigurationClassNames">
<Array type="java.lang.String">
<Item>org.mortbay.jetty.plus.PlusWebAppContext$Configuration</Item>
<Item>org.mortbay.jetty.servlet.JettyWebConfiguration</Item>
<Item>org.mortbay.jetty.servlet.jsr77.Configuration</Item>
</Array>
</Set>
2) run Jetty with jmx enabled:
java -Dmain.class=org.mortbay.xml.XmlConfiguration
-DSTART=extra/etc/start-plus.config -jar start.jar
extra/etc/jettyplus-jmx.xml
Note that the above documented instructions are given for the JettyPlus
server,
but should work with the standard Jetty server so long as the jsr77.jar
built from the
$JETTY_HOME/extra/jsr77 package is on Jetty's classpath.
I gather that for the web console, you are looking not only at the JSR77
servlet stats, but want to apply JSR77-type metrics to the
container-specific
stats as well?
That's correct. In fact, at the moment I'm just trying to get a more
generic management implementation of the container stats in the style of
the JSR77 stats ... but I'm not really looking for the JSR77 servlet
stats right now. You mentioned in another note that you were hoping to
create a new jetty image soon.
I think our needs to complete what we are already receiving in part from
Jetty would be met if you could provide these container statistics:
- getConnectionsOpenMin
- getConnectionsRequestsMin
- getConnectionsRequestsCurrent
- getConnectionsDurationMin
- getConnectionsDurationCount
- getConnectionsDurationTotal
- getRequestsActiveMin
- getRequestsDurationMin
- getRequestsDurationCount
- getRequestsDurationTotal
Hopefully, we will be able to get similar stats from Tomcat.
There is one other matter regarding how stats are enabled/disabled. I
don't see in the JSR77 spec where this type of processing is available.
It looks like stats are always presumed to be active. However, since
the jetty stats can be enabled and disabled at any time I've been
thinking of extending the JSR77-like container stats to also include the
notion of enabling and disabling the collect of statistics in the
WebContainerStats interface. Are there thoughts from those that are
better versed in JSR77 about the ability to enable/disable the
collection of stats?
cheers
Jan
Aaron Mulder wrote:
Jan, is there some sample code for acessing the Jetty JSR-77 stats? If
you have some of that plumbing in place already, and we can use
what's there, that would be great.
Next best might be looking at the code for your JSR-77 implementation
and seeing how you dig up the numbers so we can try to do it the same
way. Is the code in CVSWeb or something where you can just give us a
URL to the JSR-77 implementation?
Thanks,
Aaron
On 11/30/05, Joe Bohn
<[EMAIL PROTECTED]> wrote:
I'm afraid we might be out of time for these changes in jetty. I was
hoping to get this JSR77-like server performance mgmt completed and
implemented for Jetty yesterday or today. That way we could have a shot
at getting similar functionality implemented for tomcat just in time for
v1. How quickly do you think you could get these changes into jetty?
Would they be in a jetty5.x version or would we have to move to jetty6?
WRT the bigger picture .... it is still a big unknown if we can get
similar information from tomcat. Several folks have provided some hints
here but I still can't find similar statistics available from within
tomcat itself. So even if we could get this today for jetty, it might
not be something we could implement for tomcat by v1.
The bigger issue is this:
1. The web console has this statistics view for jetty but it is
hard-coded in the portlet itself for jetty alone.
2. We'd like to provide equivalent capabilities for jetty and tomcat in
the console.
3. This requires a common management interface for the console to use
that can be implemented by both jetty and tomcat. Aaron began creating
this JSR77-like style stats management. I've been completing it and
working on the jetty implementation with the goal to not lose function
from what was already available for jetty in the console.
4. We have to create the tomcat statistics management implementation
that is conformant to the new structure.
I'm currently at about 90% of #3 above with the issues mentioned in my
original post on this thread.
We could either:
A. Leave well enough alone for v1 and deliver the existing function for
jetty but not tomcat.
B. Implement the new structure and partial Jetty implementation. This
would be slightly less information than we currently display to the user
but would get us on a better path. We could include the tomcat
version if time and capability of tomcat permit.
C. Remove the web server statistics portlet entirely from the console
for v1.
Opinions? Aaron, IIUC you wanted me to continue to pursue this for v1
based upon your response to my earlier post. Is that still your
opinion?
http://mail-archives.apache.org/mod_mbox/geronimo-dev/200511.mbox/[EMAIL PROTECTED]
Joe
Jan Bartel wrote:
Joe,
When do you need these statistics by?
We could certainly add methods like:
getConnectionsDuration()
getConnectionsRequests()
getRequestsDuration()
which would return an ever-increasing counter, and then you
would be able to infer the averages by using the getStatsOnMs()
method. That would be more in line with JSR77 type stats for your
purposes I think.
For Jetty6 we will be following more of the JSR77 style stats
gathering. Your feedback on this would be useful so we can
ensure that Jetty6 slurps into Geronimo with minimum fuss.
cheers
Jan
Joe Bohn wrote:
Jan,
Thanks for the information and the offer of help.
I'm not familiar with either Jetty's raw JMX stats or Jetty's JSR77
implementation but I don't think I'm referring to either.
What Aaron and I are trying to do is a JSR77-like implementation to
deliver statistic information about the web container itself.
The Web Console (in the Web Server portlet) is currently getting this
type of information from org.mortbay.jetty.Server extension of
org.mortbay.http.HttpServer. The stats are things like total # of
connections accepted, # of open connections, max # of open
connections, avg connection duration, max connection duration, avg #
or active requests, max # of active requests, etc....
The enabling of these statistics is at the very bottom of the XML that
you attached as "statsOn" under other server options.
Can we get this information from the raw JMX stats?
Joe
Jan Bartel wrote:
Joe,
Are you refering to Jetty's raw jmx statistics available from the
management console or to Jetty's JSR77 implementation?
Jetty supports JSR77 via a filter. Have a look at the Jetty
extra/jsr77 package in the Jetty source tree. It is part of the
JettyPlus server, but
should be able to be extracted to work with vanilla jetty. I've
attached
the jettyplus config files that enables it for your info.
I can work with you on this to enable jsr77 for jetty if you'd like.
cheers
Jan
Joe Bohn wrote:
I'm working a new JSR77 like management API for performance
monitoring of Jetty (soon to be followed by Tomcat) started by
Aaron. However, I'm hitting some incompatibilities between the
currently available Jetty statistics from the server (and displayed
in the console today) and JSR77 performance monitoring style
reporting.
Jetty can report averages for some attributes such as the number of
connection requests, the duration of connections and the duration of
requests. When Jetty provides an average of some statistic the only
other value typically provided is the maximum (this is true for all
three).
JSR77 performance monitoring does not track/store any averages.
Rather, for TimeStatistics only, it is expected that the average can
be computed by dividing the total time by the total count. There is
not a way to compute the average for range statistics (such as the
connection requests). I would like to be able to infer the missing
values from the average but I don't have enough information
available from Jetty.
Given this mismatch I can do one of the following:
1) Don't make available the reporting of averages from Jetty for the
three statistics. Since there are no other values available, the
result will be that we will only display the maximum value for the
particular statistic(for Time values we'd be missing minimum, total
time, and count - for Range that's current and LowWaterMark).
2) Provide some extensions on the JSR77 Statistics in the console or
geronimo Jetty packages to store and retrieve the averages in
addition to the other values. Once again we would not have values
for the other statistic fields ... just average and maximum.
I'll need to work out the same or similar performance statistics for
Tomcat as soon as I have the Jetty capability resolved (which I hope
is still in the next day). So, I'll need some help from you Tomcat
experts soon! :-)
Joe
--
Joe Bohn
[EMAIL PROTECTED]
"He is no fool who gives what he cannot keep, to gain what he cannot
lose." -- Jim Elliot
--
Joe Bohn
[EMAIL PROTECTED]
"He is no fool who gives what he cannot keep, to gain what he cannot
lose." -- Jim Elliot
