While starting VM with 'considerlasthost' enabled, don't load host tags/details for the last host when it doesn't exist [main] (apache#9063)

Author: sureshanaparti

engine/orchestration/src/main/java/com/cloud/vm/VirtualMachineManagerImpl.java

@@ -1077,6 +1077,10 @@ protected void checkAndAttemptMigrateVmAcrossCluster(final VMInstanceVO vm, fina
             return;
         }
         Host lastHost = _hostDao.findById(vm.getLastHostId());
+        if (lastHost == null) {
+            logger.warn("Could not find last host with id [{}], skipping migrate VM [{}] across cluster check." , vm.getLastHostId(), vm.getUuid());
+            return;
+        }
         if (destinationClusterId.equals(lastHost.getClusterId())) {
             return;
         }

server/src/main/java/com/cloud/deploy/DeploymentPlanningManagerImpl.java

@@ -458,10 +458,9 @@ private DeployDestination deployInVmLastHost(VirtualMachineProfile vmProfile, De
             DeploymentPlanner planner, VirtualMachine vm, DataCenter dc, ServiceOffering offering, int cpuRequested, long ramRequested,
             boolean volumesRequireEncryption) throws InsufficientServerCapacityException {
         HostVO host = _hostDao.findById(vm.getLastHostId());
-        _hostDao.loadHostTags(host);
-        _hostDao.loadDetails(host);
-
         if (canUseLastHost(host, avoids, plan, vm, offering, volumesRequireEncryption)) {
+            _hostDao.loadHostTags(host);
+            _hostDao.loadDetails(host);
             if (host.getStatus() != Status.Up) {
                 logger.debug("Cannot deploy VM [{}] to the last host [{}] because this host is not in UP state or is not enabled. Host current status [{}] and resource status [{}].",
                         vm.getUuid(), host.getUuid(), host.getState().name(), host.getResourceState());