IGNITE-13742 Disabled auto-activation in maintenance mode.

modules/core/src/main/java/org/apache/ignite/internal/IgniteKernal.java

@@ -1195,7 +1195,7 @@ public void start(
 
             // Assign discovery manager to context before other processors start so they
             // are able to register custom event listener.
-            GridManager discoMgr = new GridDiscoveryManager(ctx);
+            GridDiscoveryManager discoMgr = new GridDiscoveryManager(ctx);
 
             ctx.add(discoMgr, false);
 
@@ -1210,10 +1210,25 @@ public void start(
             startProcessor(mntcProcessor);
 
             if (mntcProcessor.isMaintenanceMode()) {
+                if (log.isInfoEnabled()) {
+                    log.info(
+                        "Node is being started in maintenance mode. " +
+                        "Starting IsolatedDiscoverySpi instead of configured discovery SPI."
+                    );
+                }
+
+                cfg.setClusterStateOnStart(ClusterState.INACTIVE);
+
+                if (log.isInfoEnabled())
+                    log.info("Overriding 'clusterStateOnStart' configuration to 'INACTIVE'.");
+
                 ctx.config().setDiscoverySpi(new IsolatedDiscoverySpi());
 
                 discoMgr = new GridDiscoveryManager(ctx);
 
+                // Reinitialized discovery manager won't have a valid consistentId on creation.
+                discoMgr.consistentId(ctx.pdsFolderResolver().resolveFolders().consistentId());
+
                 ctx.add(discoMgr, false);
             }
 

modules/core/src/main/java/org/apache/ignite/internal/processors/cluster/GridClusterStateProcessor.java

@@ -1049,6 +1049,12 @@ public IgniteInternalFuture<?> changeGlobalState(
         boolean forceChangeBaselineTopology,
         boolean isAutoAdjust
     ) {
+        if (ctx.maintenanceRegistry().isMaintenanceMode()) {
+            return new GridFinishedFuture<>(
+                new IgniteCheckedException("Failed to " + prettyStr(state) + " (node is in maintenance mode).")
+            );
+        }
+
         BaselineTopology blt = (compatibilityMode && !forceChangeBaselineTopology) ?
             null :
             calculateNewBaselineTopology(state, baselineNodes, forceChangeBaselineTopology);