![[wl_ipc_logicalparallelapplystatechange.png|256]] - **Description**: The process is waiting for a logical replication parallel apply worker to change its state (e.g., from 'initializing' to 'ready'). The leader manages this synchronization state machine in shared memory and relies on OS-level condition variables (`WaitLatch`) to be signaled when the worker finishes transitioning. - **Resources**: [[CPU]], [[Memory]]