> [!WalSummarizerError] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_timeout_walsummarizererror.png"></td><td><b>Wait Category</b></td><td>Timeout</td></tr><tr><td><b>Mechanism</b></td><td><code>WalSummarizerError</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Distributed/Redistribute">Redistribute</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/CPU">CPU</a>, <a href="Resources/disk IO">disk IO</a></td></tr><tr><td colspan="3"><b>Self-Healing Recovery Delay</b>. Introduced in Postgres 17 to support incremental backups, the WAL Summarizer process continuously scans WAL files to create summarized snapshots of changed blocks.</td></tr></table>