Fix for usage server getting stuck due to duplicate VM events (#13019)

Author: abh1sar

engine/schema/src/main/java/com/cloud/upgrade/DatabaseUpgradeChecker.java

@@ -33,7 +33,6 @@
 
 import javax.inject.Inject;
 
-import com.cloud.upgrade.dao.Upgrade42020to42030;
 import com.cloud.utils.FileUtil;
 import org.apache.cloudstack.utils.CloudStackVersion;
 import org.apache.commons.lang3.StringUtils;
@@ -90,6 +89,8 @@
 import com.cloud.upgrade.dao.Upgrade41900to41910;
 import com.cloud.upgrade.dao.Upgrade41910to42000;
 import com.cloud.upgrade.dao.Upgrade42000to42010;
+import com.cloud.upgrade.dao.Upgrade42020to42030;
+import com.cloud.upgrade.dao.Upgrade42030to42040;
 import com.cloud.upgrade.dao.Upgrade420to421;
 import com.cloud.upgrade.dao.Upgrade421to430;
 import com.cloud.upgrade.dao.Upgrade430to440;
@@ -238,6 +239,7 @@ public DatabaseUpgradeChecker() {
                 .next("4.19.1.0", new Upgrade41910to42000())
                 .next("4.20.0.0", new Upgrade42000to42010())
                 .next("4.20.2.0", new Upgrade42020to42030())
+                .next("4.20.3.0", new Upgrade42030to42040())
                 .build();
     }
 

engine/schema/src/main/java/com/cloud/upgrade/dao/Upgrade42030to42040.java

@@ -0,0 +1,58 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+package com.cloud.upgrade.dao;
+
+import java.io.InputStream;
+import java.sql.Connection;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Upgrade42030to42040 extends DbUpgradeAbstractImpl implements DbUpgrade, DbUpgradeSystemVmTemplate {
+
+    @Override
+    public String[] getUpgradableVersionRange() {
+        return new String[]{"4.20.3.0", "4.20.4.0"};
+    }
+
+    @Override
+    public String getUpgradedVersion() {
+        return "4.20.4.0";
+    }
+
+    @Override
+    public boolean supportsRollingUpgrade() {
+        return false;
+    }
+
+    @Override
+    public InputStream[] getPrepareScripts() {
+        return null;
+    }
+
+    @Override
+    public void performDataMigration(Connection conn) {
+        final List<String> indexList = new ArrayList<String>();
+        logger.debug("Dropping index vm_instance_id from usage_vm_instance table if it exists");
+        indexList.add("vm_instance_id");
+        DbUpgradeUtils.dropKeysIfExist(conn, "cloud_usage.usage_vm_instance", indexList, false);
+    }
+
+    @Override
+    public InputStream[] getCleanupScripts() {
+        return null;
+    }
+}