> [!NOTE] ![[assets/wl_timeout_walsummarizererror.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | Timeout | > | **Mechanism** | `WalSummarizerError` | > | **Operations** | [[Operations/Distributed/Redistribute]] | > | **Resources** | [[Resources/CPU|CPU]], [[Resources/disk IO]] | > > **Self-Healing Recovery Delay**. Introduced in Postgres 17 to support incremental backups, the WAL Summarizer process continuously scans WAL files to create summarized snapshots of changed blocks.