Understanding Orphaned Partitions

Orphaned partitions are partition databases present on leaf nodes that the master aggregator node doesn’t consider part of the cluster (they’re neither master nor replica partition databases). This means the master aggregator node will drop this database if it ever gets in the way of something it wants to do.

It is possible in a crash scenario to have an orphaned partition that is the last valid copy of a partition. In this case, you will want to attach the orphan back into the cluster immediately.