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Tibco Rendezvous (RV): Virtual Circuit, Fault Tolerance and Current Value Cache


Virtual Circuit:
Virtual circuit (VC) provides exclusive communication between two nodes. Only the two nodes can communicate with each other. The sender can only send messages to opposite node and the receiver can receive messages only from the opposite node. If there is a requirement where transport should be done among specific nodes and no other listener should get the information then VC should be used.

Fault Tolerance:
When the active program fails, the fault tolerance software directs one of the backup programs to become active and start processing. To configure programs in FT mode below parameters must be configured:

Active Goal: It defines the total  number of active members. For example: If the active goal is set as 4, there will be 4 active members those have the highest ranks among all the members.

Rank: Each program has a unique rank. If a program has N rank and another program has N+1 rank, then N is a higher rank than N+1. It determines the members who’ll be active according to active goal.

Weight: Weight represents the ability of the program to fulfill its function. The member with highest weight is given the highest rank.

Heartbeat Interval: The inactive member listens for heartbeat messages from active members. These messages tell that the active members are working fine. Heartbeat Interval specifies the time/interval after which the heartbeat message is published.

Activation Interval: When a failover happen, it is detected by the inactive members through the heartbeat failure. Activation interval is the time till which inactive members wait for heartbeats before becoming active.

Preparation Interval: If an inactive program needs time to prepare before becoming active like for setting up a database connection then preparation interval is set.

Current Value Cache:
Tibco RV provides rvcache utility which can store current messages for each subject and the new listeners can retrieve the messages from the cache. This feature fulfills the requirement of new programs joining the system which may need to access some existing information.
Rvcache can also be configured in fault tolerance by starting multiple instances of rv cache. For this run two or more rv processes on separate computers. All the processes store the messages but the one that is active sends the messages to any new listener and rest of the processes stay as inactive.

For configuring rvcache in FT mode all the parameters remain same for all the processes of rvcache except for the –store parameter.

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Other Topics :


Tibco Rendezvous (RV): Intro
Tibco Rendezvous (RV): Features and More
Tibco Rendezvous (RV): Transport and More
Tibco Rendezvous (RV): Monitoring and Troubleshooting
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