import org.apache.ambari.server.orm.entities.UpgradeGroupEntity;
import org.apache.ambari.server.orm.entities.UpgradeItemEntity;
import org.apache.ambari.server.stack.MasterHostResolver;
<BUG>import org.apache.ambari.server.state.Cluster;
import org.apache.ambari.server.state.ConfigHelper;
import org.apache.ambari.server.state.ServiceInfo;</BUG>
import org.apache.ambari.server.state.StackId;
import org.apache.ambari.server.state.StackInfo;
import org.apache.ambari.server.state.UpgradeContext;
import org.apache.ambari.server.state.UpgradeHelper;

import org.apache.ambari.server.orm.entities.UpgradeGroupEntity;
import org.apache.ambari.server.orm.entities.UpgradeItemEntity;
import org.apache.ambari.server.stack.MasterHostResolver;
import org.apache.ambari.server.state.Cluster;
import org.apache.ambari.server.state.Config;
import org.apache.ambari.server.state.ConfigHelper;
import org.apache.ambari.server.state.PropertyInfo;
import org.apache.ambari.server.state.ServiceInfo;
import org.apache.ambari.server.state.StackId;
import org.apache.ambari.server.state.StackInfo;
import org.apache.ambari.server.state.UpgradeContext;
import org.apache.ambari.server.state.UpgradeHelper;
