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Posted to users@tomcat.apache.org by Jo...@wellsfargo.com.INVALID on 2019/02/08 17:09:27 UTC

Does Tomcat count incoming connections?

Hi all,

I'm interested in knowing how many new incoming connections are being created, possibly per connector.  Does Tomcat have such a thing?  I assume it would involve counting calls to ServerSocketChannel.accept() or something like that.  I see the GlobalRequestProcessor MBean has a request count, but I would also like to know connection count.

Thank you

John

Re: Does Tomcat count incoming connections?

Posted by Christopher Schultz <ch...@christopherschultz.net>.

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Hash: SHA256

Ronald,

On 2/8/19 15:39, Roskens, Ronald wrote:
> 
> 
>> -----Original Message----- From:
>> John.E.Gregg@wellsfargo.com.INVALID 
>> [mailto:John.E.Gregg@wellsfargo.com.INVALID] Sent: Friday,
>> February 08, 2019 2:24 PM To: users@tomcat.apache.org Subject:
>> [[EXTERNAL]] RE: Does Tomcat count incoming connections?
>> 
>> Chris,
>> 
>> 
>>> -----Original Message----- From: Christopher Schultz
>>> <ch...@christopherschultz.net> Sent: Friday, February 08, 2019
>>> 11:48 AM To: users@tomcat.apache.org Subject: Re: Does Tomcat
>>> count incoming connections?
>>> 
>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
>>> 
>>> John,
>>> 
>>> 
>>> You can get this count from the Connector via JMX.
>>> 
>>> Look at the tree under
>>> /Catalina/GlobalRequestProcessor/[connector] and there is a
>>> "requestCount" attribute that can be queried.
>>> 
>>> Looks like it's an int value, so it can overflow.
>>> 
>>> - -chris
>> 
>> Thanks but the requestCount really does appear to be requests and
>> not connections.  I have keepAliveTimeout and
>> maxKeepAliveRequests at their defaults (unlimited timeout and 100
>> requests) and I see the count go up with each request, even
>> though my client reports that the connection is getting reused.
>> 
>> I'm asking because I need some hard data on whether clients are
>> reusing their connections for performance reasons.
> 
> How about the Catalina Threadpool ?
> 
> It has busyThreads, active connections, poller threads, and
> keep-alive threads metrics.

Hmm.

My initial thought was that the thread pool would be unaware of the
incoming connections because typically the thread pool is only used to
dispatch a request to a request processing thread (in the standard
servlet blocking-I/O model). Things obviously get more complicated
with the asynchronous dispatch model and Websocket.

But there is in fact a connectionCount property of the "ThreadPool"
MBean, which is really exposing the information being kept by an
instance of the AbstractEndpoint class.

If you look at the connection-state management, you'll see that this
value will go up and down as connections are made and broken rather
than being a count of total connections ever made. If this is what you
are looking for, then I think you can go ahead and use it. If you want
a total-count of all time, it looks like adding it to the
AbstractEndpoint is the way to go.

- -chris
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RE: Does Tomcat count incoming connections?

Posted by "Roskens, Ronald" <Ro...@biworldwide.com>.


> -----Original Message-----
> From: John.E.Gregg@wellsfargo.com.INVALID
> [mailto:John.E.Gregg@wellsfargo.com.INVALID]
> Sent: Friday, February 08, 2019 2:24 PM
> To: users@tomcat.apache.org
> Subject: [[EXTERNAL]] RE: Does Tomcat count incoming connections?
> 
> Chris,
> 
> 
> > -----Original Message-----
> > From: Christopher Schultz <ch...@christopherschultz.net>
> > Sent: Friday, February 08, 2019 11:48 AM
> > To: users@tomcat.apache.org
> > Subject: Re: Does Tomcat count incoming connections?
> >
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA256
> >
> > John,
> >
> >
> > You can get this count from the Connector via JMX.
> >
> > Look at the tree under /Catalina/GlobalRequestProcessor/[connector]
> > and there is a "requestCount" attribute that can be queried.
> >
> > Looks like it's an int value, so it can overflow.
> >
> > - -chris
> 
> Thanks but the requestCount really does appear to be requests and not
> connections.  I have keepAliveTimeout and maxKeepAliveRequests at their
> defaults (unlimited timeout and 100 requests) and I see the count go up with
> each request, even though my client reports that the connection is getting
> reused.
> 
> I'm asking because I need some hard data on whether clients are reusing
> their connections for performance reasons.

How about the Catalina Threadpool ?

It has busyThreads, active connections, poller threads, and keep-alive threads metrics.

Ron

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Re: Does Tomcat count incoming connections?

Posted by Christopher Schultz <ch...@christopherschultz.net>.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

John,

On 2/8/19 15:24, John.E.Gregg@wellsfargo.com.INVALID wrote:
>> -----Original Message----- From: Christopher Schultz
>> <ch...@christopherschultz.net> Sent: Friday, February 08, 2019
>> 11:48 AM To: users@tomcat.apache.org Subject: Re: Does Tomcat
>> count incoming connections?
>> 
>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
>> 
>> John,
>> 
>> 
>> You can get this count from the Connector via JMX.
>> 
>> Look at the tree under
>> /Catalina/GlobalRequestProcessor/[connector] and there is a
>> "requestCount" attribute that can be queried.
>> 
>> Looks like it's an int value, so it can overflow.
>> 
>> - -chris
> 
> Thanks but the requestCount really does appear to be requests and 
> not connections.  I have keepAliveTimeout and maxKeepAliveRequests
> at their defaults (unlimited timeout and 100 requests) and I see
> the count go up with each request, even though my client reports
> that the connection is getting reused.> I'm asking because I need
> some hard data on whether clients are reusing their connections for
> performance reasons.
I'm really sorry. I must admit I read the first sentence and not the
second and told you something you already wrote in your first post :(

I don't see anywhere that a connection count is currently available,
but it doesn't seem like it would be that much work to add it. I'm not
sure what the best place to /put it/ would be, since there really
isn't anything that coarse-grained in the JMX tree at this point.

For example, the GlobalRequestProcessor is, as the name suggests,
request-oriented. I think the ProtocolHandler is much the same. The
Connector itself is, unfortunately, mostly useless because it just
shows the configuration of the connector and nothing really live.

Hopefully Mark or Rémy will reply; they both understand the connection
management at a very low level and will probably say "already done!"
or "eww... that's going to be complicated." With luck, the former.

- -chris
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RE: Does Tomcat count incoming connections?

Posted by Jo...@wellsfargo.com.INVALID.

Chris, 


> -----Original Message-----
> From: Christopher Schultz <ch...@christopherschultz.net>
> Sent: Friday, February 08, 2019 11:48 AM
> To: users@tomcat.apache.org
> Subject: Re: Does Tomcat count incoming connections?
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
> 
> John,
> 
> 
> You can get this count from the Connector via JMX.
> 
> Look at the tree under /Catalina/GlobalRequestProcessor/[connector]
> and there is a "requestCount" attribute that can be queried.
> 
> Looks like it's an int value, so it can overflow.
> 
> - -chris

Thanks but the requestCount really does appear to be requests and not connections.  I have keepAliveTimeout and maxKeepAliveRequests at their defaults (unlimited timeout and 100 requests) and I see the count go up with each request, even though my client reports that the connection is getting reused.

I'm asking because I need some hard data on whether clients are reusing their connections for performance reasons.

John

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Re: Does Tomcat count incoming connections?

Posted by Christopher Schultz <ch...@christopherschultz.net>.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

John,

On 2/8/19 12:09, John.E.Gregg@wellsfargo.com.INVALID wrote:
> I'm interested in knowing how many new incoming connections are
> being created, possibly per connector.  Does Tomcat have such a
> thing?  I assume it would involve counting calls to
> ServerSocketChannel.accept() or something like that.  I see the
> GlobalRequestProcessor MBean has a request count, but I would also
> like to know connection count.

You can get this count from the Connector via JMX.

Look at the tree under /Catalina/GlobalRequestProcessor/[connector]
and there is a "requestCount" attribute that can be queried.

Looks like it's an int value, so it can overflow.

- -chris
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Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/

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