| /** |
| * 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.hadoop.hdfs.server.blockmanagement; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.collect.HashMultimap; |
| import com.google.common.collect.Multimap; |
| import com.google.common.collect.UnmodifiableIterator; |
| import com.google.common.collect.Iterables; |
| import com.google.common.collect.Collections2; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hdfs.DFSConfigKeys; |
| import org.apache.hadoop.hdfs.protocol.DatanodeID; |
| import org.apache.hadoop.hdfs.protocol.DatanodeAdminProperties; |
| import org.apache.hadoop.hdfs.protocol.DatanodeInfo.AdminStates; |
| |
| import java.io.IOException; |
| |
| import java.net.InetAddress; |
| import java.net.InetSocketAddress; |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.Map; |
| |
| import com.google.common.base.Predicate; |
| |
| import org.apache.hadoop.hdfs.util.CombinedHostsFileReader; |
| |
| /** |
| * This class manages datanode configuration using a json file. |
| * Please refer to {@link CombinedHostsFileReader} for the json format. |
| * <p/> |
| * <p/> |
| * Entries may or may not specify a port. If they don't, we consider |
| * them to apply to every DataNode on that host. The code canonicalizes the |
| * entries into IP addresses. |
| * <p/> |
| * <p/> |
| * The code ignores all entries that the DNS fails to resolve their IP |
| * addresses. This is okay because by default the NN rejects the registrations |
| * of DNs when it fails to do a forward and reverse lookup. Note that DNS |
| * resolutions are only done during the loading time to minimize the latency. |
| */ |
| public class CombinedHostFileManager extends HostConfigManager { |
| private static final Logger LOG = LoggerFactory.getLogger( |
| CombinedHostFileManager.class); |
| private Configuration conf; |
| private HostProperties hostProperties = new HostProperties(); |
| |
| static class HostProperties { |
| private Multimap<InetAddress, DatanodeAdminProperties> allDNs = |
| HashMultimap.create(); |
| // optimization. If every node in the file isn't in service, it implies |
| // any node is allowed to register with nn. This is equivalent to having |
| // an empty "include" file. |
| private boolean emptyInServiceNodeLists = true; |
| synchronized void add(InetAddress addr, |
| DatanodeAdminProperties properties) { |
| allDNs.put(addr, properties); |
| if (properties.getAdminState().equals( |
| AdminStates.NORMAL)) { |
| emptyInServiceNodeLists = false; |
| } |
| } |
| |
| // If the includes list is empty, act as if everything is in the |
| // includes list. |
| synchronized boolean isIncluded(final InetSocketAddress address) { |
| return emptyInServiceNodeLists || Iterables.any( |
| allDNs.get(address.getAddress()), |
| new Predicate<DatanodeAdminProperties>() { |
| public boolean apply(DatanodeAdminProperties input) { |
| return input.getPort() == 0 || |
| input.getPort() == address.getPort(); |
| } |
| }); |
| } |
| |
| synchronized boolean isExcluded(final InetSocketAddress address) { |
| return Iterables.any(allDNs.get(address.getAddress()), |
| new Predicate<DatanodeAdminProperties>() { |
| public boolean apply(DatanodeAdminProperties input) { |
| return input.getAdminState().equals( |
| AdminStates.DECOMMISSIONED) && |
| (input.getPort() == 0 || |
| input.getPort() == address.getPort()); |
| } |
| }); |
| } |
| |
| synchronized String getUpgradeDomain(final InetSocketAddress address) { |
| Iterable<DatanodeAdminProperties> datanode = Iterables.filter( |
| allDNs.get(address.getAddress()), |
| new Predicate<DatanodeAdminProperties>() { |
| public boolean apply(DatanodeAdminProperties input) { |
| return (input.getPort() == 0 || |
| input.getPort() == address.getPort()); |
| } |
| }); |
| return datanode.iterator().hasNext() ? |
| datanode.iterator().next().getUpgradeDomain() : null; |
| } |
| |
| Iterable<InetSocketAddress> getIncludes() { |
| return new Iterable<InetSocketAddress>() { |
| @Override |
| public Iterator<InetSocketAddress> iterator() { |
| return new HostIterator(allDNs.entries()); |
| } |
| }; |
| } |
| |
| Iterable<InetSocketAddress> getExcludes() { |
| return new Iterable<InetSocketAddress>() { |
| @Override |
| public Iterator<InetSocketAddress> iterator() { |
| return new HostIterator( |
| Collections2.filter(allDNs.entries(), |
| new Predicate<java.util.Map.Entry<InetAddress, |
| DatanodeAdminProperties>>() { |
| public boolean apply(java.util.Map.Entry<InetAddress, |
| DatanodeAdminProperties> entry) { |
| return entry.getValue().getAdminState().equals( |
| AdminStates.DECOMMISSIONED); |
| } |
| } |
| )); |
| } |
| }; |
| } |
| |
| synchronized long getMaintenanceExpireTimeInMS( |
| final InetSocketAddress address) { |
| Iterable<DatanodeAdminProperties> datanode = Iterables.filter( |
| allDNs.get(address.getAddress()), |
| new Predicate<DatanodeAdminProperties>() { |
| public boolean apply(DatanodeAdminProperties input) { |
| return input.getAdminState().equals( |
| AdminStates.IN_MAINTENANCE) && |
| (input.getPort() == 0 || |
| input.getPort() == address.getPort()); |
| } |
| }); |
| // if DN isn't set to maintenance state, ignore MaintenanceExpireTimeInMS |
| // set in the config. |
| return datanode.iterator().hasNext() ? |
| datanode.iterator().next().getMaintenanceExpireTimeInMS() : 0; |
| } |
| |
| static class HostIterator extends UnmodifiableIterator<InetSocketAddress> { |
| private final Iterator<Map.Entry<InetAddress, |
| DatanodeAdminProperties>> it; |
| public HostIterator(Collection<java.util.Map.Entry<InetAddress, |
| DatanodeAdminProperties>> nodes) { |
| this.it = nodes.iterator(); |
| } |
| @Override |
| public boolean hasNext() { |
| return it.hasNext(); |
| } |
| |
| @Override |
| public InetSocketAddress next() { |
| Map.Entry<InetAddress, DatanodeAdminProperties> e = it.next(); |
| return new InetSocketAddress(e.getKey(), e.getValue().getPort()); |
| } |
| } |
| } |
| |
| @Override |
| public Iterable<InetSocketAddress> getIncludes() { |
| return hostProperties.getIncludes(); |
| } |
| |
| @Override |
| public Iterable<InetSocketAddress> getExcludes() { |
| return hostProperties.getExcludes(); |
| } |
| |
| @Override |
| public void setConf(Configuration conf) { |
| this.conf = conf; |
| } |
| |
| @Override |
| public Configuration getConf() { |
| return conf; |
| } |
| |
| @Override |
| public void refresh() throws IOException { |
| refresh(conf.get(DFSConfigKeys.DFS_HOSTS, "")); |
| } |
| private void refresh(final String hostsFile) throws IOException { |
| HostProperties hostProps = new HostProperties(); |
| DatanodeAdminProperties[] all = |
| CombinedHostsFileReader.readFile(hostsFile); |
| for(DatanodeAdminProperties properties : all) { |
| InetSocketAddress addr = parseEntry(hostsFile, |
| properties.getHostName(), properties.getPort()); |
| if (addr != null) { |
| hostProps.add(addr.getAddress(), properties); |
| } |
| } |
| refresh(hostProps); |
| } |
| |
| @VisibleForTesting |
| static InetSocketAddress parseEntry(final String fn, final String hostName, |
| final int port) { |
| InetSocketAddress addr = new InetSocketAddress(hostName, port); |
| if (addr.isUnresolved()) { |
| LOG.warn("Failed to resolve {} in {}. ", hostName, fn); |
| return null; |
| } |
| return addr; |
| } |
| |
| @Override |
| public synchronized boolean isIncluded(final DatanodeID dn) { |
| return hostProperties.isIncluded(dn.getResolvedAddress()); |
| } |
| |
| @Override |
| public synchronized boolean isExcluded(final DatanodeID dn) { |
| return isExcluded(dn.getResolvedAddress()); |
| } |
| |
| private boolean isExcluded(final InetSocketAddress address) { |
| return hostProperties.isExcluded(address); |
| } |
| |
| @Override |
| public synchronized String getUpgradeDomain(final DatanodeID dn) { |
| return hostProperties.getUpgradeDomain(dn.getResolvedAddress()); |
| } |
| |
| @Override |
| public long getMaintenanceExpirationTimeInMS(DatanodeID dn) { |
| return hostProperties.getMaintenanceExpireTimeInMS(dn.getResolvedAddress()); |
| } |
| |
| /** |
| * Set the properties lists by the new instances. The |
| * old instance is discarded. |
| * @param hostProperties the new properties list |
| */ |
| @VisibleForTesting |
| private void refresh(final HostProperties hostProperties) { |
| synchronized (this) { |
| this.hostProperties = hostProperties; |
| } |
| } |
| } |