Merge pull request #1457 from nvazquez/excludeclusters

CLOUDSTACK-9333: Exclude clusters from OVF operationsJIRA TICKET: https://issues.apache.org/jira/browse/CLOUDSTACK-9333

## Introduction
In some environments there is a need to exclude certain VMware clusters from performing OVF operations. This operations are part of:
* create template
* create volume snaphsot
* copy template, volume, images from primary storage to secondary storage
* migrate volume
* participate when a template gets cached over to primary storage.

In ESX/ESXi, OVF operations are low priority and bound to a single CPU and most likely get throttled to certain IOPS and network limits.
If the hypervisor chosen for OVF operations is weak or overloaded this results in significantly longer execution of such OVF command and therefore degraded performance of underlying CloudStack API call.

### Proposed solution
It is proposed to add a way to exclude hosts from selected clusters for OVF operations.
To exclude a cluster, would be necessary to insert a record in <code>cluster_details</code> specifying property **vmware.exclude_from_ovf** in this way: (supposing we want to exclude cluster X)

| cluster_id | name| value |
|:-------------:|:-------------:|:-------------:|
|X|vmware.exclude_from_ovf|true|

* pr/1457:
  CLOUDSTACK-9333: Exclude clusters for OVF operations

Signed-off-by: Will Stevens <williamstevens@gmail.com>

engine/components-api/src/com/cloud/capacity/CapacityManager.java

@@ -53,6 +53,16 @@ public interface CapacityManager {
             "0.85",
             "Percentage (as a value between 0 and 1) of allocated storage utilization above which allocators will disable using the pool for low allocated storage available.",
             true, ConfigKey.Scope.Zone);
+    static final ConfigKey<Boolean> StorageOperationsExcludeCluster =
+            new ConfigKey<Boolean>(
+                    Boolean.class,
+                    "cluster.storage.operations.exclude",
+                    "Advanced",
+                    "false",
+                    "Exclude cluster from storage operations",
+                    true,
+                    ConfigKey.Scope.Cluster,
+                    null);
 
     public boolean releaseVmCapacity(VirtualMachine vm, boolean moveFromReserved, boolean moveToReservered, Long hostId);
 

engine/storage/src/org/apache/cloudstack/storage/endpoint/DefaultEndPointSelector.java

@@ -44,6 +44,7 @@ import org.apache.cloudstack.engine.subsystem.api.storage.VolumeInfo;
 import org.apache.cloudstack.storage.LocalHostEndpoint;
 import org.apache.cloudstack.storage.RemoteHostEndPoint;
 
+import com.cloud.capacity.CapacityManager;
 import com.cloud.host.Host;
 import com.cloud.host.HostVO;
 import com.cloud.host.Status;
@@ -64,9 +65,13 @@ public class DefaultEndPointSelector implements EndPointSelector {
     private static final Logger s_logger = Logger.getLogger(DefaultEndPointSelector.class);
     @Inject
     HostDao hostDao;
-    private final String findOneHostOnPrimaryStorage =
-        "select h.id from host h, storage_pool_host_ref s  where h.status = 'Up' and h.type = 'Routing' and h.resource_state = 'Enabled' and"
-            + " h.id = s.host_id and s.pool_id = ? ";
+    private final String findOneHostOnPrimaryStorage = "select t.id from "
+                            + "(select h.id, cd.value "
+                            + "from host h join storage_pool_host_ref s on h.id = s.host_id  "
+                            + "join cluster c on c.id=h.cluster_id "
+                            + "left join cluster_details cd on c.id=cd.cluster_id and cd.name='" + CapacityManager.StorageOperationsExcludeCluster.key() + "' "
+                            + "where h.status = 'Up' and h.type = 'Routing' and h.resource_state = 'Enabled' and s.pool_id = ? ";
+
     private String findOneHypervisorHostInScope = "select h.id from host h where h.status = 'Up' and h.hypervisor_type is not null ";
 
     protected boolean moveBetweenPrimaryImage(DataStore srcStore, DataStore destStore) {
@@ -115,6 +120,7 @@ public class DefaultEndPointSelector implements EndPointSelector {
             sbuilder.append(scope.getScopeId());
         }
         // TODO: order by rand() is slow if there are lot of hosts
+        sbuilder.append(") t where t.value<>'true' or t.value is null");    //Added for exclude cluster's subquery
         sbuilder.append(" ORDER by rand() limit 1");
         String sql = sbuilder.toString();
         HostVO host = null;

server/src/com/cloud/capacity/CapacityManagerImpl.java

@@ -1082,6 +1082,6 @@ public class CapacityManagerImpl extends ManagerBase implements CapacityManager,
     @Override
     public ConfigKey<?>[] getConfigKeys() {
         return new ConfigKey<?>[] {CpuOverprovisioningFactor, MemOverprovisioningFactor, StorageCapacityDisableThreshold, StorageOverprovisioningFactor,
-            StorageAllocatedCapacityDisableThreshold};
+            StorageAllocatedCapacityDisableThreshold, StorageOperationsExcludeCluster};
     }
 }

setup/db/db/schema-481to490.sql

@@ -410,3 +410,6 @@ VIEW `user_vm_view` AS
             AND (`custom_speed`.`name` = 'CpuSpeed'))))
         LEFT JOIN `user_vm_details` `custom_ram_size` ON (((`custom_ram_size`.`vm_id` = `vm_instance`.`id`)
             AND (`custom_ram_size`.`name` = 'memory'))));
+
+-- Add cluster.storage.operations.exclude property
+INSERT INTO `cloud`.`configuration` (`category`, `instance`, `component`, `name`, `description`, `default_value`, `updated`, `scope`, `is_dynamic`) VALUES ('Advanced', 'DEFAULT', 'CapacityManager', 'cluster.storage.operations.exclude', 'Exclude cluster from storage operations', 'false', now(), 'Cluster', '1');