From 46c85980fc0e7674667ad808ca481a3c97c7a3d3 Mon Sep 17 00:00:00 2001
From: Sam Tunnicliffe <samt@apache.org>
Date: Fri, 3 Jul 2026 17:08:51 +0100
Subject: [PATCH] Include system_cluster_metadata keyspace in a full rebuild of
 all keyspaces

---
 src/java/org/apache/cassandra/service/Rebuild.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/java/org/apache/cassandra/service/Rebuild.java b/src/java/org/apache/cassandra/service/Rebuild.java
index c766dddacb..70da6c031e 100644
--- a/src/java/org/apache/cassandra/service/Rebuild.java
+++ b/src/java/org/apache/cassandra/service/Rebuild.java
@@ -58,6 +58,7 @@ import org.apache.cassandra.utils.concurrent.Future;
 import org.apache.cassandra.utils.concurrent.FutureCombiner;
 import org.apache.cassandra.utils.concurrent.UncheckedInterruptedException;
 
+import static org.apache.cassandra.schema.SchemaConstants.METADATA_KEYSPACE_NAME;
 import static org.apache.cassandra.utils.FBUtilities.getBroadcastAddressAndPort;
 
 public class Rebuild
@@ -236,6 +237,9 @@ public class Rebuild
         if (keyspace == null)
         {
             placements.forEach((params, placement) -> movementMapBuilder.put(params, addMovementsForParams(placement, null)));
+            // Special case to include the system metadata keyspace
+            ReplicationParams metaParams = Keyspace.open(METADATA_KEYSPACE_NAME).getMetadata().params.replication;
+            movementMapBuilder.put(metaParams, addMovementsForParams(metadata.placement(metaParams), null));
         }
         else if (tokens == null)
         {