The ExitProperties stanza

The

ExitProperties stanza specifies configuration options used by queue manager exit programs.

CLWLMode=SAFE|FAST

The cluster workload exit, CLWL, allows you to specify which cluster queue in the cluster is to be opened in response to an MQI call (MQOPEN, MQPUT, and so on). The CLWL exit runs either in FAST mode or SAFE mode depending on the value you specify on the CLWLMode attribute. If you omit the CLWLMode attribute, the cluster workload exit runs in SAFE mode.

SAFE

Run the CLWL exit in a separate process to the queue manager. This is the default.

If a problem arises with the user-written CLWL exit when running in SAFE mode, the following happens:

• The CLWL server process (amqzlwa0) fails

• The queue manager restarts the CLWL server process

• The error is reported to you in the error log. If an MQI call is in progress, you receive notification in the form of a bad return code.

The integrity of the queue manager is preserved.

Note:

There is a possible performance overhead associated with running the CLWL exit in a separate process.

FAST

Run the cluster exit inline in the queue manager process.

Specifying this option improves performance by avoiding the overheads associated with running in SAFE mode, but does so at the expense of queue manager integrity. Run the CLWL exit in FAST mode only if you are convinced that there are no problems with your CLWL exit, and you are particularly concerned about performance overheads.

If a problem arises when the CLWL exit is running in FAST mode, the queue manager fails and you run the risk of compromising the integrity of the queue manager.