https://issues.apache.org/bugzilla/show_bug.cgi?id=56703

            Bug ID: 56703
           Summary: "Current number of backend connections" counter ever
                    increasing when timeouts are defined
           Product: Tomcat Connectors
           Version: 1.2.40
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_jk
          Assignee: dev@tomcat.apache.org
          Reporter: kn...@knobisoft.de

Hi,

  our environment is (I know, some are old ...):

Apache 2.2.21
mod_jk-1.2.40
Tomcat 7.0.42

We have found that the numbers for "Con", the current number of backend
connections" is growing steadily, well over any sensible number.

The following configuration seems to trigger the behavior:

worker.template.type=ajp13
worker.template.lbfactor=1
worker.template.prepost_timeout=15000
worker.template.connect_timeout=15000
worker.template.ping_timeout=15000
worker.template.ping_mode=A
worker.template.connection_ping_interval=180
worker.template.retries=3
worker.template.connection_pool_timeout=30

Without setting the timeout values, the displayed number of backend connections
looks to be stable.

The behavior seems to have started between mod_jk-1.2.32 and mod_jk-1.2.37.
Looking at the code, I can see some heavy redo of the handling of the
"connected" counter. I suspect a "connected--" is missing, but hard to say
where.

Cheers
Martin

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