According to the documentation (java doc) of ignite.queue(): Will get a named queue from cache and create one if it has not been created yet and cfg is not null. If queue is present already, queue properties will not be changed. Use collocation for CacheMode.PARTITIONED caches if you have lots of relatively small queues as it will make fetching, querying, and iteration a lot faster. If you have few very large queues, then you should consider turning off collocation as they simply may not fit in a single node's memory.
Params: name – Name of queue. cap – Capacity of queue, 0 for unbounded queue. Ignored if cfg is null. cfg – Queue configuration if new queue should be created. Returns: Queue with given properties. Throws: org.apache.ignite.IgniteException – If queue could not be fetched or created. But when getting an non existing queue without QueueConfiguration the queue is null and no exception is thrown. Documentation should say that it returns a Queue or Null, but it doesn't. It says that it will throw an exception if the queue could not be fetched or created, but it doesn't. It just returns null. -- Sent from: http://apache-ignite-users.70518.x6.nabble.com/
