> [!NOTE] ![[assets/wl_lwlock_logicalrepworkerhash.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | LWLock | > | **Mechanism** | `LogicalRepWorkerLock` | > | **Operations** | [[Operations/Distributed/Redistribute]] | > | **Resources** | [[Resources/RAM|Memory]], [[Resources/CPU|CPU]] | > > This wait event represents a synchronization stall in the **Schema Mapping Registry**. Every time a logical replication worker receives a change, it must quickly identify which local table and columns correspond to the remote data; this mapping is cached in a per-worker hash table in shared memory.