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Chapter 9. Detecting dead connections
To prevent AMQ Broker from running out of system resources, it is necessary to clean up inactive server-side resources, which often remain when clients do not stop gracefully. You can configure the duration that AMQ Broker waits before it cleans up inactive server-side resources.
9.1. Detecting dead connections
During garbage collection, the broker identifies client connections that were not properly shut down. The broker closes each connection and writes a message to the log. The log shows the exact line of code where a client session was instantiated, which enables you to identify and correct the error.
The following is an example of a message written to the log for a client connection that was not properly shut down.
Because the network connection between the client and the server can fail and then come back online, which allows a client to reconnect, AMQ Broker waits to clean up inactive server-side resources. This wait period is called a time to live (TTL). The default TTL for a network-based connection is 60000 milliseconds (1 minute). The default TTL on an in-VM connection is -1, which means the broker never times out the connection on the broker side.
9.2. Configuring a connection time to live on the broker
The duration the broker waits before it cleans up inactive server-side resources is called a time to live (TTL). If you do not want any TTL value set by clients to apply, you can set a global TTL value on the broker, along with the interval at which the broker checks for TTL violations.
Procedure
Edit
<broker_instance_dir>/etc/broker.xmlby adding theconnection-ttl-overrideconfiguration element and providing a value for the time to live, as in the example below.Copy to Clipboard Copied! Toggle word wrap Toggle overflow - connection-ttl-override
-
The global TTL for all connections. In the example, the TTL is set to 30000 milliseconds. The default value is
-1, which allows clients to set their own TTL. - connection-ttl-check-interval
- The interval between checks for dead connections. In the example, the interval is set to 1000 milliseconds. By default, the checks are done every 2000 milliseconds.
Additional resources
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