The following table describes the Java system properties used by the Broker to control various optional behaviours.
The preferred method of enabling these system properties is using the QPID_OPTS environment variable described in the previous
section.
Table B.1. System properties
| System property | Default | Purpose |
|---|---|---|
| qpid.broker_heartbeat_timeout_factor | 2 | Factor to determine the maximum length of that may elapse between heartbeats being received from the peer before a connection is deemed to have been broken. |
| qpid.broker_dead_letter_queue_suffix | _DLQ | Used with the Section 9.4.3, “Alternate Binding” feature. Governs the suffix used when generating a name for a Dead Letter Queue. |
| qpid.broker_status_updates | true |
If set true, the Broker will produce operational logging messages. |
| qpid.broker_disabled_features | none |
Allows optional Broker features to be disabled. Currently understood feature
names are: Feature names should be comma separated. |
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