> [!SnapbuildSync] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_io_snapbuildsync.png"></td><td><b>Wait Category</b></td><td>IO</td></tr><tr><td><b>Mechanism</b></td><td><code>Snapbuild</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/disk IO">disk IO</a>, <a href="Resources/CPU">CPU</a></td></tr><tr><td colspan="3"><b>Replication Catalog Durability Barrier</b>. To ensure that logical decoding can resume correctly after a crash, the engine must "seal" its constructed snapshots onto the disk before it can advance the replication slot's LSN.</td></tr></table>