Persistence: Stores and Durables
Stores and durables provide persistent message interest and persistent message streams.
For an intuitive introduction and terminology, see “Persistence: Stores and Durables” in TIBCO FTL Concepts.
- Purposes of Persistence
The persistence infrastructure of stores and durables can serve four purposes: delivery assurance, apportioning message streams, last-value availability, and key/value maps. These purposes correspond to four types of durables: standard durables, shared durables, last-value durables, and map durables. - Persistence Architecture
Persistence is flexible. Administrators can tailor various aspects of persistence to meet the needs of applications. - Coordination for Persistence
Administrators and application developers must coordinate the details of durables. - Stores for Delivery Assurance
The following topics present the details of delivery assurance for architects and administrators. - Stores for Apportioning Message Streams
This topic presents the details of apportioning message streams for architects and administrators. - Stores for Last-Value Availability
This topic presents the details of last-value availability for architects and administrators. - Stores for Message Broker
This topic presents information for architects and administrators about using stores to implement a message broker. - Default Durable
You can use the default durable to add delivery assurance to any application, even applications that do not explicitly supply a durable name or a subscriber name in their create subscriber calls. - Durable Behavior
Administrators configure the behavior of a durable and its interaction with durable subscribers. - Wide-Area Forwarding
Client applications can publish and subscribe across network boundaries. To enable this behavior, administrators define forwarding zones and wide-area stores. - Arranging a Wide-Area Store
To define a wide-area store, use the stores grid of the FTL server GUI. - Wide-Area Forwarding: Runtime Conditions
Wide-area forwarding places configuration prerequisites on the runtime topology of FTL servers, and clusters of persistence services. - Persistence Services and Clusters
If a cluster of FTL servers provide persistence services, those persistence services cooperate in a persistence cluster. A persistence cluster maintains a set of persistence stores which store messages in durables. - Configuring Persistence
The realm definition schematic in the following diagram indicates five configuration tasks for persistence stores and durables. (Numbers in the diagram correspond to the task steps that follow.) - Memory Reserve for Persistence Services
Memory reserve is pre-allocated memory with which a persistence service could continue limited operations after exhausting available memory. - Starting a Persistence Service
Administrators have full responsibility for persistence service configuration and operation. - Stopping or Restarting a Persistence Service
To permanently stop an individual persistence service, terminate the FTL server process that manages it. To stop and restart an individual persistence service, use the shutdown command. - Persistence Monitoring and Management
The following topics present tools in the FTL server GUI to help monitor and manage persistence. - Before Forcing a Quorum
When a persistence cluster contains enough reachable persistence services, but not enough non-empty services to form a quorum, an administrator may force a quorum. Read this topic first. - Saving and Loading Persistence State
The persistence GUI includes a facility to save the content of a persistence service’s stores to a file. When a new persistence service starts, it can load its initial state from that file. You can use this facility for nightly backups, during upgrade migration, or to migrate a persistence cluster to a new physical location. - Clock Synchronization, Affiliated FTL Servers, and Persistence
Persistence services depend on clock synchronization among their host computers.
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