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Re: [jetty-users] Connections stuck in CLOSE_WAIT
Ok, thanks for the reply.  I'll try upgrading to 12.

Thanks,
Josh

On Wed, Feb 28, 2024 at 11:33 AM Joakim Erdfelt <joakim@xxxxxxxxxxx> wrote:
Jetty 10 & Jetty 11 are now at End of Community Support.


You should be using Jetty 12 at this point in time.
If you have a need for continued support for the javax.servlet namespace (vs jakarta.servlet), you can use the Jetty 12 "ee8" environment to maintain use of that old namespace.

Joakim Erdfelt / joakim@xxxxxxxxxxx


On Wed, Feb 28, 2024 at 1:23 PM Josh Spiegel via jetty-users <jetty-users@xxxxxxxxxxx> wrote:
Hi,

We have a custom implementation of Connection and ConnectionFactory for a non-http protocol.  (Jetty 10.0.14)

In general, it works great even when many requests are happening concurrently.  We've performed extensive stress testing and haven't had any issues. 

However, we hit an issue recently where some poorly written client code produced a storm of connection open requests (TLS is enabled).  It did this for about an hour or so.  After the storm ended, we found that some connections were left stuck in the CLOSE_WAIT state and are seemingly stuck there indefinitely.  

netstat -all --program | grep 12345
tcp6       0      0 host:12345 10.0.0.5:20390          CLOSE_WAIT  5727/java          
tcp6       0      0 host:12345 10.0.0.5:14840          CLOSE_WAIT  5727/java          
tcp6       1      0 host:12345 10.0.0.5:8830           CLOSE_WAIT  5727/java  
...

We were also able to see the result of calling ServerConnector.getConnectedEndPoints().  The result similarly showed the stuck connections. 

We've been able to reproduce in a development environment once by creating a storm of open/close requests and letting it run for about 45 minutes.  

Does anyone know what might cause this to occur so rarely?  Could it be a bug in our Connection implementation?  Or in Jetty itself?

Thanks,
Josh


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