SingleStore DB

Tools: Aggregator Failures
Master Aggregator Fails

If the Master Aggregator node fails and is recoverable, restart the Master Aggregator.

If it is not recoverable, a Child Aggregator must be promoted to the role of Master Aggregator by running either AGGREGATOR SET AS MASTER in SQL or sdb-admin bootstrap-aggregator on the command line.

One Child Aggregator Fails

If a Child Aggregator is recoverable, restart the Child Aggregator.

If it is not recoverable, deploy a new aggregator by creating a new node and adding it to the cluster as a Child Aggregator.

Many Aggregators Fail

If more than one aggregator fails, each aggregator can either be reintroduced or removed, created, and then replaced one by one.