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TIBCO Rendezvous® 8.8.0

# Avoid Duplicates

Listening programs rarely profit from receiving duplicate copies of the current data. To prevent duplicates, consider one of these strategies:

| • | Run exactly one `rvcache` service.

| • | Ensure that `rvcache` services store disjoint subject sets.

When two or more `rvcache` services store the same subjects, then duplicate messages can result. It the subject sets do not overlap, then duplication cannot occur.

| • | Segregate `rvcache` services by listening on different UDP services.

You can use different UDP services to isolate groups of program processes so that members of each group receive Rendezvous messages exclusively from other members of the same group. In such cases, configure a separate instance of `rvcache` for each group by setting its service parameter to match the UDP service used by group members. For more detail about this parameter, see Service Selection.

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