Re: Query regarding HAProxy + Embedded Tomcat(8.0.20)

[Christopher Schultz]

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Hash: SHA1

Mohammad,

On 1/24/16 12:11 PM, Mohammad Salman wrote:
> Hi Chris, i am using Embedded-tomcat via spring-boot. So most the
> configuration is automatically done by it.
> 
> i have configured only maxThread value to 1000 thread per host.

You can't set the maximum number of threads for a host, only for a
connector (which must be attached to a service, not a host).

I don't see any 1s timeouts that you have configured in HAproxy.
That's why I was wondering what is being configured on the Tomcat side
(specifically, the keep-alive timeout).

If you have 1 connections from HAProxy ( x 3 ) then each Tomcat
server should have 3 connections available. The number of threads
is not important unless you are really using a significant number of
those 3 connections simultaneously, or if you are using the BIO
connector (which requires one thread for each connection).

> I have managed to get some configuration via jConsole. PFA
> screenshot.

Non-text attachments are stripped from the list, so nothing came through
.

- -chris

> On Sat, Jan 23, 2016 at 2:07 AM, Christopher Schultz 
>  > wrote:
> 
> Mohammad,
> 
> On 1/21/16 2:02 PM, Mohammad Salman wrote:
>> Hi, I am seeing periodic latency spikes in HAProxy logs. Latency
>> spike correspond to high *TC* (Backend connect time ) times (all
>> ranging
> from
>> *1000-1010* ms). Suspecting some kind of timeout happening but
> doesnt know
>> which one.
>> 
>> Following is the HAProxy configuration Current HAProxy config
>> timeouts:
>> 
>> retries 3 timeout http-request10s timeout
>> queue   1m timeout connect 10s timeout client
>> 1m timeout server  5m timeout http-keep-alive 100s 
>> timeout check   10s maxconn 1
>> 
>> while analyzing HAProxy logs, i have seen a pattern in TC
>> occurances. each tomcat server have TC for all HAproxy at some
>> second. so issues seems to be with tomcat config.
>> 
>> 
>> i am using default config of embedded tomcat (8.0.20)
>> 
>> in my infra, there are 3 HAProxy servers(for load balancing) 3
>> embedded tomcat servers
>> 
>> Please suggest if someone knows whats going wrong in the system
>> ?
> 
> What is your Tomcat  configuration?
> 
> -chris
> 
> -
>
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Re: Query regarding HAProxy + Embedded Tomcat(8.0.20)

[Mohammad Salman]

Hi Chris,
i am using Embedded-tomcat via spring-boot.
So most the configuration is automatically done by it.

i have configured only maxThread value to 1000 thread per host.

I have managed to get some configuration via jConsole. PFA screenshot.



​


On Sat, Jan 23, 2016 at 2:07 AM, Christopher Schultz <
ch...@christopherschultz.net> wrote:

> Mohammad,
>
> On 1/21/16 2:02 PM, Mohammad Salman wrote:
> > Hi,
> > I am seeing periodic latency spikes in HAProxy logs. Latency spike
> > correspond to high *TC* (Backend connect time ) times (all ranging from
> > *1000-1010* ms). Suspecting some kind of timeout happening but doesnt
> know
> > which one.
> >
> > Following is the HAProxy configuration
> > Current HAProxy config timeouts:
> >
> > retries 3
> > timeout http-request10s
> > timeout queue   1m
> > timeout connect 10s
> > timeout client  1m
> > timeout server  5m
> > timeout http-keep-alive 100s
> > timeout check   10s
> > maxconn 1
> >
> > while analyzing HAProxy logs, i have seen a pattern in TC occurances.
> > each tomcat server have TC for all HAproxy at some second.
> > so issues seems to be with tomcat config.
> >
> >
> > i am using default config of embedded tomcat (8.0.20)
> >
> > in my infra,
> > there are 3 HAProxy servers(for load balancing)
> > 3 embedded tomcat servers
> >
> > Please suggest if someone knows whats going wrong in the system ?
>
> What is your Tomcat  configuration?
>
> -chris
>
> -
> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> For additional commands, e-mail: users-h...@tomcat.apache.org
>
>

Re: Query regarding HAProxy + Embedded Tomcat(8.0.20)

[Christopher Schultz]

Mohammad,

On 1/21/16 2:02 PM, Mohammad Salman wrote:
> Hi,
> I am seeing periodic latency spikes in HAProxy logs. Latency spike
> correspond to high *TC* (Backend connect time ) times (all ranging from
> *1000-1010* ms). Suspecting some kind of timeout happening but doesnt know
> which one.
> 
> Following is the HAProxy configuration
> Current HAProxy config timeouts:
> 
> retries 3
> timeout http-request10s
> timeout queue   1m
> timeout connect 10s
> timeout client  1m
> timeout server  5m
> timeout http-keep-alive 100s
> timeout check   10s
> maxconn 1
> 
> while analyzing HAProxy logs, i have seen a pattern in TC occurances.
> each tomcat server have TC for all HAproxy at some second.
> so issues seems to be with tomcat config.
> 
> 
> i am using default config of embedded tomcat (8.0.20)
> 
> in my infra,
> there are 3 HAProxy servers(for load balancing)
> 3 embedded tomcat servers
> 
> Please suggest if someone knows whats going wrong in the system ?

What is your Tomcat  configuration?

-chris

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Query regarding HAProxy + Embedded Tomcat(8.0.20)

[Mohammad Salman]

Hi,
I am seeing periodic latency spikes in HAProxy logs. Latency spike
correspond to high *TC* (Backend connect time ) times (all ranging from
*1000-1010* ms). Suspecting some kind of timeout happening but doesnt know
which one.

Following is the HAProxy configuration
Current HAProxy config timeouts:

retries 3
timeout http-request10s
timeout queue   1m
timeout connect 10s
timeout client  1m
timeout server  5m
timeout http-keep-alive 100s
timeout check   10s
maxconn 1

while analyzing HAProxy logs, i have seen a pattern in TC occurances.
each tomcat server have TC for all HAproxy at some second.
so issues seems to be with tomcat config.


i am using default config of embedded tomcat (8.0.20)

in my infra,
there are 3 HAProxy servers(for load balancing)
3 embedded tomcat servers




Please suggest if someone knows whats going wrong in the system ?

Thanks,
Salman