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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: Slow HTTP Rquest via Tomcat
Date Tue, 13 Jan 2015 03:41:28 GMT
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Thone,

On 1/12/15 6:03 PM, Thone Soungpanya wrote:
> When connecting from Tomcat to third party, we are going through a 
> servlet code which is customized by us. We package the code into a 
> jar file which sits on the \WEB-INF\lib folder. When connection,
> we create a session and connect through the application server IP 
> address, jolt port, username and password. The third party system
> we connect to is a PeopleSoft ERP system.
> 
> When the problem occurs, I would estimate it to be about 200 or so 
> active sessions through just that one folder. Now, another thing I 
> forgot to mention is, we have multiple web application folders
> with the same files but just different PeopleTools version to
> support for different clients. These are not slowing up and they
> have about maybe 10 - 20 sessions. Just throwing this information
> out there in case.
> 
> Also to note again, I do not think it is the connection to the
> third party. While reviewing the logs, I notice when connecting to
> third party, it takes about 10 seconds round-trip. We write logs
> when it begin connection to end connection. Something is
> bottlenecking in the tomcat server before trying to connect.

The number of uses sessions is largely irrelevant. What is relevant is
the number of simultaneous requests that are being made to your own
web application, and how many are trying to create these outgoing
connections.

(Just curious: what is a "jolt port"?)

If you have a 20-50 second pause, there's enough time to trigger a
thread dump of the application (see the wiki HOWTO section for how to
do that). A thread dump will tell you where the code is hanging. It's
not likely to be in Tomcat itself.

- -chris

> -----Original Message----- From: cjderham@gmail.com 
> [mailto:cjderham@gmail.com] On Behalf Of chris derham Sent:
> Monday, January 12, 2015 2:43 PM To: Tomcat Users List Subject: Re:
> Slow HTTP Rquest via Tomcat
> 
> On 13 January 2015 at 11:38, Thone Soungpanya 
> <thone.Soungpanya@higherone.com> wrote:
>> Hello,
>> 
>> Can anyone give some advice on what the issue may be? We have a
>> web application folder in Tomcat that have been slowing the http 
>> request's connection to another third party system when there
>> are high traffic. It seems to be halting in the Tomcat server for
>> about 20 - 50 seconds before attempting to connect to the third
>> party system. Once it tries to connect to the third party system,
>> the response time is only about 6 - 10 seconds which is normal.
>> It does not seem to be an issue at the third party's end as the
>> response time is quick once we get connected.
>> 
>> Here are the specs that we have and additional information...
>> 
>> 1) Apache Tomcat 7.0.56 2) JVM version 1.7 3) Running on Linux
>> OS Version 2.6.32
>> 
>> Connection Flow: 1) User submits a HTTP request from web 
>> application to Tomcat 2) Tomcat calls Java's servlet code along 
>> with HTTP request parameters 3) Java servlet code connects to
>> third party system via application server and jolt port 4) Third
>> party system returns requested information
>> 
>> We thought it would be a session issue which we lowered the
>> session timeout (just for that folder) in WEB-INF folder to 5
>> minutes from defaulted 30 minutes but it is still doing the same
>> thing.
>> 
>> Any advice on what it may be? Let me know if you need additional 
>> information.
> 
> How does your code connect to the 3rd party? There are libraries
> that do this, please elaborate which you use. I recall using one,
> and it had a limit on the number of concurrent connections to a 3rd
> party. Perhaps you hit this limit? How many connections are you
> talking about when the problem occurs - 10s, 100s, 1000s or more?
> 
> Chris
> 
>> Thank you in advance!
>> 
>> Thone
> 
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