Module dropped 

Dropped region GC handling.

This module handles garbage collection for “dropped regions”. A dropped region is:

1. Recorded in table_repart metadata (the only place that still remembers it)
2. No longer exists in table_route metadata (removed from region routing)
3. No longer present in any datanode’s heartbeat (physically closed)

This differs from “active regions” which exist in both metadata and heartbeats. The table_repart entry serves as a tombstone that tracks which regions were merged/split and need their files cleaned up.

Structs

DroppedRegionAssignment 🔒

Result of collecting and assigning dropped regions to peers.

DroppedRegionCollector 🔒

Collector for dropped regions that need GC.

DroppedRegionInfo 🔒

Information about a dropped region ready for GC.