| /* |
| * 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.stack; |
| |
| import static java.util.Arrays.asList; |
| import static java.util.Collections.emptyList; |
| import static java.util.Collections.singletonList; |
| import static java.util.stream.Collectors.toCollection; |
| import static java.util.stream.Collectors.toList; |
| |
| import java.util.ArrayList; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.stream.Stream; |
| |
| import org.apache.ambari.server.state.Cluster; |
| import org.apache.ambari.server.state.Host; |
| import org.apache.ambari.server.state.MaintenanceState; |
| import org.apache.ambari.server.state.ServiceComponentHost; |
| |
| /** |
| * Wrapper around a collection of hosts for components. Some components |
| * also have master/secondary designators. |
| */ |
| public class HostsType { |
| /** |
| * List of HA hosts (master - secondaries pairs), if any. |
| */ |
| private final List<HighAvailabilityHosts> highAvailabilityHosts; |
| |
| /** |
| * Ordered collection of hosts. This represents all hosts where an upgrade |
| * or downgrade must occur. For an upgrade, all hosts are set. For a downgrade, |
| * this list may be a subset of all hosts where the downgrade MUST be executed. |
| * That is to say, a downgrade only occurs where the current version is not |
| * the target version. |
| */ |
| private LinkedHashSet<String> hosts; |
| |
| /** |
| * Unhealthy hosts are those which are explicitly put into maintenance mode. |
| * If there is a host which is not heartbeating (or is generally unhealthy) |
| * but not in maintenance mode, then the prerequisite upgrade checks will let |
| * the administrator know that it must be put into maintenance mode before an |
| * upgrade can begin. |
| */ |
| public List<ServiceComponentHost> unhealthy = new ArrayList<>(); |
| |
| /** |
| * @return true if master components list is not empty |
| */ |
| public boolean hasMasters() { |
| return !getMasters().isEmpty(); |
| } |
| |
| public List<HighAvailabilityHosts> getHighAvailabilityHosts() { |
| return highAvailabilityHosts; |
| } |
| |
| /** |
| * Order the hosts so that for each HA host the secondaries come first. |
| * For example: [sec1, sec2, master1, sec3, sec4, master2] |
| */ |
| public void arrangeHostSecondariesFirst() { |
| hosts = getHighAvailabilityHosts().stream() |
| .flatMap(each -> Stream.concat(each.getSecondaries().stream(), Stream.of(each.getMaster()))) |
| .collect(toCollection(LinkedHashSet::new)); |
| } |
| |
| /** |
| * @return true if both master and secondary components lists are not empty |
| */ |
| public boolean hasMastersAndSecondaries() { |
| return !getMasters().isEmpty() && !getSecondaries().isEmpty(); |
| } |
| |
| /** |
| * A master and secondary host(s). In HA mode there is one master and one secondary host, |
| * in federated mode there can be more than one secondaries. |
| */ |
| public static class HighAvailabilityHosts { |
| private final String master; |
| private final List<String> secondaries; |
| |
| public HighAvailabilityHosts(String master, List<String> secondaries) { |
| if (master == null) { |
| throw new IllegalArgumentException("Master host is missing"); |
| } |
| this.master = master; |
| this.secondaries = secondaries; |
| } |
| |
| public String getMaster() { |
| return master; |
| } |
| |
| public List<String> getSecondaries() { |
| return secondaries; |
| } |
| } |
| |
| /** |
| * Creates an instance from the optional master and secondary components and with the given host set |
| */ |
| public static HostsType from(String master, String secondary, LinkedHashSet<String> hosts) { |
| return master == null |
| ? normal(hosts) |
| : new HostsType(singletonList(new HighAvailabilityHosts(master, secondary != null ? singletonList(secondary) : emptyList())), hosts); |
| |
| } |
| |
| /** |
| * Create an instance with exactly one high availability host (master-secondary pair) and with the given host set |
| */ |
| public static HostsType highAvailability(String master, String secondary, LinkedHashSet<String> hosts) { |
| return new HostsType(singletonList(new HighAvailabilityHosts(master, singletonList(secondary))), hosts); |
| } |
| |
| /** |
| * Create an instance with an arbitrary chosen high availability host. |
| */ |
| public static HostsType guessHighAvailability(LinkedHashSet<String> hosts) { |
| if (hosts.isEmpty()) { |
| throw new IllegalArgumentException("Cannot guess HA, empty hosts."); |
| } |
| String master = hosts.iterator().next(); |
| List<String> secondaries = hosts.stream().skip(1).collect(toList()); |
| return new HostsType(singletonList(new HighAvailabilityHosts(master, secondaries)), hosts); |
| } |
| |
| /** |
| * Create an instance with multiple high availability hosts. |
| */ |
| public static HostsType federated(List<HighAvailabilityHosts> highAvailabilityHosts, LinkedHashSet<String> hosts) { |
| return new HostsType(highAvailabilityHosts, hosts); |
| } |
| |
| /** |
| * Create an instance without high availability hosts. |
| */ |
| public static HostsType normal(LinkedHashSet<String> hosts) { |
| return new HostsType(emptyList(), hosts); |
| } |
| |
| /** |
| * Create an instance without high availability hosts. |
| */ |
| public static HostsType normal(String... hosts) { |
| return new HostsType(emptyList(), new LinkedHashSet<>(asList(hosts))); |
| } |
| |
| /** |
| * Create an instance with a single (non high availability) host. |
| */ |
| public static HostsType single(String host) { |
| return HostsType.normal(host); |
| } |
| |
| /** |
| * Create an instance with all healthy hosts. |
| */ |
| public static HostsType healthy(Cluster cluster) { |
| LinkedHashSet<String> hostNames = new LinkedHashSet<>(); |
| for (Host host : cluster.getHosts()) { |
| MaintenanceState maintenanceState = host.getMaintenanceState(cluster.getClusterId()); |
| if (maintenanceState == MaintenanceState.OFF) { |
| hostNames.add(host.getHostName()); |
| } |
| } |
| |
| return normal(hostNames); |
| } |
| |
| private HostsType(List<HighAvailabilityHosts> highAvailabilityHosts, LinkedHashSet<String> hosts) { |
| this.highAvailabilityHosts = highAvailabilityHosts; |
| this.hosts = hosts; |
| } |
| |
| public LinkedHashSet<String> getMasters() { |
| return highAvailabilityHosts.stream().map(each -> each.getMaster()).collect(toCollection(LinkedHashSet::new)); |
| } |
| |
| public LinkedHashSet<String> getSecondaries() { |
| return highAvailabilityHosts.stream().flatMap(each -> each.getSecondaries().stream()).collect(toCollection(LinkedHashSet::new)); |
| } |
| |
| public Set<String> getHosts() { |
| return hosts; |
| } |
| |
| public void setHosts(LinkedHashSet<String> hosts) { |
| this.hosts = hosts; |
| } |
| } |