Configuring Queue
An example declarative configuration is shown below.
<hazelcast>
...
<queue name="tasks">
<max-size>10</max-size>
<backup-count>1</backup-count>
<async-backup-count>1</async-backup-count>
<empty-queue-ttl>10</empty-queue-ttl>
</queue>
</hazelcast>
Hazelcast distributed queue has one synchronous backup by default. By having this backup, when a cluster member with a queue goes down, another member having the backup of that queue will continue. Therefore, no items are lost. You can define the number of synchronous backups for a queue using the backup-count element in the declarative configuration. A queue can also have asynchronous backups: you can define the number of asynchronous backups using the async-backup-count element.
To set the maximum size of the queue, use the max-size element. To purge unused or empty queues after a period of time, use the empty-queue-ttl element. If you define a value (time in seconds) for the empty-queue-ttl element, then your queue will be destroyed if it stays empty or unused for the time you give.
RELATED INFORMATION
Please refer to the Queue Configuration section for a full description of Hazelcast Distributed Queue configuration.