The Restream Queue is your safety net to ensure no data loss. A data pipeline built in-house or another tool without it could mean a schema change or error in your data stream (for example, pushing a string to an integer field, a type conversion error) could cause you to lose data. Same thing if you run a transformation that improperly formats events - data gets lost.
To eliminate these data loss and schema change problems, Alooma stores all new events from a schema change or any events that did not make it to your target data warehouse properly in a buffer known as the Restream Queue. Once you have addressed the errors, the events can be restreamed to your target data warehouse by clicking the Restream Queue button in the Plumbing screen - and no data is lost.