The Outbox feature requires persistence in order to store messages and enable deduplication.
Extra collections created by the RavenDB Outbox persistence
To keep track of duplicate messages, the RavenDB implementation of Outbox creates a special collection of documents called
Deduplication record lifespan
The RavenDB persistence retains deduplication records for 7 days by default and runs the cleanup operation every minute.
These settings can be modified by specifying the desired values in the settings dictionary:
var outbox = endpointConfiguration.EnableOutbox(); outbox.SetTimeToKeepDeduplicationData(TimeSpan.FromDays(7)); outbox.SetFrequencyToRunDeduplicationDataCleanup(TimeSpan.FromMinutes(1));
Starting with NServiceBus.RavenDB version 6.3, it is recommended to disable cleanup and rely on document expiration instead.
Cleanup may be disabled by specifying
var outbox = endpointConfiguration.EnableOutbox(); outbox.SetFrequencyToRunDeduplicationDataCleanup(Timeout.InfiniteTimeSpan);
If document expiration cannot be used, to improve efficiency it is advised to run cleanup on only one endpoint instance per RavenDB database, by disabling clean up on all other endpoint instances.