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Any known problems using Tomcat 7.0.42 apr/native (windows) with websockets?

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posted Aug 6, 2013 by Sheetal Chauhan

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+3 votes

As we start load testing our jsr-356 applications, I'd like to find out if there are any websocket-specific connector settings we should be aware of for tuning the underlying websocket connection processing. Since this is a tcp socket at the end of the day, I'm assuming all the socket.* options still apply if needed.

+1 vote

My development setup is Win7 while my production is RHEL6. Both of the environments have the same settings in conf/logging.properties but the files in logs/ are slightly different.

The access logs are named the same way. But on RHEL there's no tomcat7-stdout or tomcat7-stderr log files. Just 'catalina.out.YEAR.MO.DY' and the cumulative "catalina.out" with no date.

What accounts for the differences? Also, how would you stop logging to the 'catalina.out' file. It gets unusably gigantic within a few days.

0 votes

Is it true that current servlet-based websocket implementation will be deprecated due to the implementation of the JSR-356. We are currently implementing a Tomcat 7-based websocket server implementation that we hoped could scale up to at least 50K concurrent connections [or more], but are concerned if there are any known issues and/or limitations with the websocket implementation in Tomcat 7.

We are currently trying to test how high Tomcat 7 will scale with regards to the maximum number of concurrent websocket connections, but have already hit some problems with only 200 concurrent connections. Perhaps it's our multi-threaded client, or Tomcat configuration - not sure at this point. We have the Tomcat Connector configured with maxConnections=50000 and maxThreads=1000, so 200 concurrent connections shouldn't be a problem.

If anyone could elaborate on the Tomcat 7 servlet websocket implementation stability from a highly concurrent aspect that would be great. Additionally, if anyone has achieved 10(s) of 1000(s) of concurrent websocket connections with Tomcat 7, can you share how Tomcat was configured, what OS it was running on, and what client library you used in testing this?

+2 votes

I'm receiving the following exception:

java.net.SocketException: "Permission denied": connect

when instantiating a Socket from a servlet:

final Socket smtpSocket = new Socket(mailTransportHost, mailTransportPort);

This application was running as a service under Windows Server 3003 R2 32-bits. After migrating it to Windows Server 2008 R2 64-bit, I cannot longer establish connection with the smtp server.

This only happen when running Tomcat as a service. Running as a standalone (starting it up using startup.bat) works fine. No exception instantiating Socket, emails are sent.

Environment:

 - Windows Server 2008 R2 64-bit
 - Tomcat 7.0.39
 - jdk1.6.0_33-x64
+1 vote

Has anyone had a large WS message sent as the response to an outbound call? We have a scenario where the request causes a 300K WS message to be sent back as the "response". The client is sending multiple WS continuation frames and after a couple of frames are successfully sent, Tomcat just closes the websocket connection. I the response fits in a single frame, it's fine. Where can I look to try and troubleshoot this?


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