When a client wants to receive a message from a partitioned queue, or from a subscription to a partitioned topic, Service Bus queries all partitions for messages, then returns the first message that is obtained from any of the messaging stores to the receiver. The selection is done randomly by Service Bus or by using a partition key that the sender can specify.
When a message is sent to a partitioned queue or topic, Service Bus assigns the message to one of the partitions. Each partition is stored in a different messaging store and handled by a different message broker. How it worksĮach partitioned queue or topic consists of multiple partitions. It isn't possible to change the partitioning option on any existing namespace, queue, or topic you can only set the option when you create the entity. When partitioning is enabled in the Premium SKU, the amount of partitions is specified during namespace creation.When partitioning is enabled in the Basic or Standard SKUs, we will always create 16 partitions.Any previously migrated partitioned entities in Premium namespaces will continue to work as expected. Partitioning is available at namespace creation for the Premium messaging SKU, and all queues and topics in that namespace will be partitioned.A namespace can have both partitioned and non-partitioned entities. Partitioning is available at entity creation for all queues and topics in Basic or Standard SKUs.There are some differences between the Basic / Standard and Premium SKU when it comes to partitioning.
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