> [!NOTE] ![[assets/wl_ipc_walsummaryready.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | IPC | > | **Mechanism** | `WALSummarizer` | > | **Operations** | [[Operations/Distributed/Redistribute]] | > | **Resources** | [[Resources/RAM|Memory]], [[Resources/CPU|CPU]] | > > **Incremental Backup Pipeline Synchronization Barrier**. Before an incremental backup can proceed, it must ensure that the WAL summary for the current WAL position has been fully processed and persisted.