| /* |
| * 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 org.apache.ambari.server.checks; |
| |
| import java.util.Arrays; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.ambari.server.AmbariException; |
| import org.apache.ambari.server.ServiceComponentNotFoundException; |
| import org.apache.ambari.server.ServiceNotFoundException; |
| import org.apache.ambari.server.controller.PrereqCheckRequest; |
| import org.apache.ambari.server.orm.dao.HostComponentStateDAO; |
| import org.apache.ambari.server.orm.entities.HostComponentStateEntity; |
| import org.apache.ambari.server.stack.MasterHostResolver; |
| import org.apache.ambari.server.state.Cluster; |
| import org.apache.ambari.server.state.ServiceComponent; |
| import org.apache.ambari.server.state.stack.PrereqCheckStatus; |
| import org.apache.ambari.server.state.stack.PrerequisiteCheck; |
| |
| import com.google.inject.Inject; |
| import com.google.inject.Singleton; |
| |
| /** |
| * Checks that the Secondary NameNode is not present on any of the hosts. |
| */ |
| @Singleton |
| @UpgradeCheck(group = UpgradeCheckGroup.NAMENODE_HA, order = 16.0f) |
| public class SecondaryNamenodeDeletedCheck extends AbstractCheckDescriptor { |
| private static final String HDFS_SERVICE_NAME = MasterHostResolver.Service.HDFS.name(); |
| |
| @Inject |
| HostComponentStateDAO hostComponentStateDao; |
| /** |
| * Constructor. |
| */ |
| public SecondaryNamenodeDeletedCheck() { |
| super(CheckDescription.SECONDARY_NAMENODE_MUST_BE_DELETED); |
| } |
| |
| @Override |
| public boolean isApplicable(PrereqCheckRequest request) throws AmbariException { |
| if (!super.isApplicable(request, Arrays.asList(HDFS_SERVICE_NAME), true)) { |
| return false; |
| } |
| |
| PrereqCheckStatus ha = request.getResult(CheckDescription.SERVICES_NAMENODE_HA); |
| if (null != ha && ha == PrereqCheckStatus.FAIL) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| // TODO AMBARI-12698, there are 2 ways to filter the prechecks. |
| // 1. Explictly mention them in each upgrade pack, which is more flexible, but requires adding the name of checks |
| // to perform in each upgrade pack. |
| // 2. Make each upgrade check class call a function before perform() that will determine if the check is appropriate |
| // given the type of upgrade. The PrereqCheckRequest object has a field for the type of upgrade. |
| @Override |
| public void perform(PrerequisiteCheck prerequisiteCheck, PrereqCheckRequest request) throws AmbariException { |
| Set<String> hosts = new HashSet<String>(); |
| final String SECONDARY_NAMENODE = "SECONDARY_NAMENODE"; |
| |
| final String clusterName = request.getClusterName(); |
| final Cluster cluster = clustersProvider.get().getCluster(clusterName); |
| try { |
| ServiceComponent serviceComponent = cluster.getService(HDFS_SERVICE_NAME).getServiceComponent(SECONDARY_NAMENODE); |
| if (serviceComponent != null) { |
| hosts = serviceComponent.getServiceComponentHosts().keySet(); |
| } |
| } catch (ServiceComponentNotFoundException err) { |
| // This exception can be ignored if the component doesn't exist because it is a best-attempt at finding it. |
| ; |
| } |
| |
| // Try another method to find references to SECONDARY_NAMENODE |
| if (hosts.isEmpty()) { |
| List<HostComponentStateEntity> allHostComponents = hostComponentStateDao.findAll(); |
| for(HostComponentStateEntity hc : allHostComponents) { |
| if (hc.getServiceName().equalsIgnoreCase(HDFS_SERVICE_NAME) && hc.getComponentName().equalsIgnoreCase(SECONDARY_NAMENODE)) { |
| hosts.add(hc.getHostName()); |
| } |
| } |
| } |
| |
| if (!hosts.isEmpty()) { |
| String foundHost = hosts.toArray(new String[hosts.size()])[0]; |
| prerequisiteCheck.getFailedOn().add(HDFS_SERVICE_NAME); |
| prerequisiteCheck.setStatus(PrereqCheckStatus.FAIL); |
| String failReason = getFailReason(prerequisiteCheck, request); |
| prerequisiteCheck.setFailReason(String.format(failReason, foundHost)); |
| } |
| } |
| } |