| /** |
| * 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.datanode; |
| |
| import java.io.IOException; |
| import java.net.InetSocketAddress; |
| import java.security.PrivilegedExceptionAction; |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hdfs.DFSConfigKeys; |
| import org.apache.hadoop.hdfs.DFSUtil; |
| import org.apache.hadoop.security.UserGroupInformation; |
| |
| import com.google.common.base.Joiner; |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.Lists; |
| import com.google.common.collect.Maps; |
| import com.google.common.collect.Sets; |
| |
| /** |
| * Manages the BPOfferService objects for the data node. |
| * Creation, removal, starting, stopping, shutdown on BPOfferService |
| * objects must be done via APIs in this class. |
| */ |
| @InterfaceAudience.Private |
| class BlockPoolManager { |
| private static final Log LOG = DataNode.LOG; |
| |
| private final Map<String, BPOfferService> bpByNameserviceId = |
| Maps.newHashMap(); |
| private final Map<String, BPOfferService> bpByBlockPoolId = |
| Maps.newHashMap(); |
| private final List<BPOfferService> offerServices = |
| Lists.newArrayList(); |
| |
| private final DataNode dn; |
| |
| //This lock is used only to ensure exclusion of refreshNamenodes |
| private final Object refreshNamenodesLock = new Object(); |
| |
| BlockPoolManager(DataNode dn) { |
| this.dn = dn; |
| } |
| |
| synchronized void addBlockPool(BPOfferService bpos) { |
| Preconditions.checkArgument(offerServices.contains(bpos), |
| "Unknown BPOS: %s", bpos); |
| if (bpos.getBlockPoolId() == null) { |
| throw new IllegalArgumentException("Null blockpool id"); |
| } |
| bpByBlockPoolId.put(bpos.getBlockPoolId(), bpos); |
| } |
| |
| /** |
| * Returns the array of BPOfferService objects. |
| * Caution: The BPOfferService returned could be shutdown any time. |
| */ |
| synchronized BPOfferService[] getAllNamenodeThreads() { |
| BPOfferService[] bposArray = new BPOfferService[offerServices.size()]; |
| return offerServices.toArray(bposArray); |
| } |
| |
| synchronized BPOfferService get(String bpid) { |
| return bpByBlockPoolId.get(bpid); |
| } |
| |
| synchronized void remove(BPOfferService t) { |
| offerServices.remove(t); |
| bpByBlockPoolId.remove(t.getBlockPoolId()); |
| |
| boolean removed = false; |
| for (Iterator<BPOfferService> it = bpByNameserviceId.values().iterator(); |
| it.hasNext() && !removed;) { |
| BPOfferService bpos = it.next(); |
| if (bpos == t) { |
| it.remove(); |
| LOG.info("Removed " + bpos); |
| removed = true; |
| } |
| } |
| |
| if (!removed) { |
| LOG.warn("Couldn't remove BPOS " + t + " from bpByNameserviceId map"); |
| } |
| } |
| |
| void shutDownAll(BPOfferService[] bposArray) throws InterruptedException { |
| if (bposArray != null) { |
| for (BPOfferService bpos : bposArray) { |
| bpos.stop(); //interrupts the threads |
| } |
| //now join |
| for (BPOfferService bpos : bposArray) { |
| bpos.join(); |
| } |
| } |
| } |
| |
| synchronized void startAll() throws IOException { |
| try { |
| UserGroupInformation.getLoginUser().doAs( |
| new PrivilegedExceptionAction<Object>() { |
| @Override |
| public Object run() throws Exception { |
| for (BPOfferService bpos : offerServices) { |
| bpos.start(); |
| } |
| return null; |
| } |
| }); |
| } catch (InterruptedException ex) { |
| IOException ioe = new IOException(); |
| ioe.initCause(ex.getCause()); |
| throw ioe; |
| } |
| } |
| |
| void joinAll() { |
| for (BPOfferService bpos: this.getAllNamenodeThreads()) { |
| bpos.join(); |
| } |
| } |
| |
| void refreshNamenodes(Configuration conf) |
| throws IOException { |
| LOG.info("Refresh request received for nameservices: " |
| + conf.get(DFSConfigKeys.DFS_NAMESERVICES)); |
| |
| Map<String, Map<String, InetSocketAddress>> newAddressMap = |
| DFSUtil.getNNServiceRpcAddresses(conf); |
| |
| synchronized (refreshNamenodesLock) { |
| doRefreshNamenodes(newAddressMap); |
| } |
| } |
| |
| private void doRefreshNamenodes( |
| Map<String, Map<String, InetSocketAddress>> addrMap) throws IOException { |
| assert Thread.holdsLock(refreshNamenodesLock); |
| |
| Set<String> toRefresh = Sets.newHashSet(); |
| Set<String> toAdd = Sets.newHashSet(); |
| Set<String> toRemove; |
| |
| synchronized (this) { |
| // Step 1. For each of the new nameservices, figure out whether |
| // it's an update of the set of NNs for an existing NS, |
| // or an entirely new nameservice. |
| for (String nameserviceId : addrMap.keySet()) { |
| if (bpByNameserviceId.containsKey(nameserviceId)) { |
| toRefresh.add(nameserviceId); |
| } else { |
| toAdd.add(nameserviceId); |
| } |
| } |
| |
| // Step 2. Any nameservices we currently have but are no longer present |
| // need to be removed. |
| toRemove = Sets.newHashSet(Sets.difference( |
| bpByNameserviceId.keySet(), addrMap.keySet())); |
| |
| assert toRefresh.size() + toAdd.size() == |
| addrMap.size() : |
| "toAdd: " + Joiner.on(",").useForNull("<default>").join(toAdd) + |
| " toRemove: " + Joiner.on(",").useForNull("<default>").join(toRemove) + |
| " toRefresh: " + Joiner.on(",").useForNull("<default>").join(toRefresh); |
| |
| |
| // Step 3. Start new nameservices |
| if (!toAdd.isEmpty()) { |
| LOG.info("Starting BPOfferServices for nameservices: " + |
| Joiner.on(",").useForNull("<default>").join(toAdd)); |
| |
| for (String nsToAdd : toAdd) { |
| ArrayList<InetSocketAddress> addrs = |
| Lists.newArrayList(addrMap.get(nsToAdd).values()); |
| BPOfferService bpos = createBPOS(addrs); |
| bpByNameserviceId.put(nsToAdd, bpos); |
| offerServices.add(bpos); |
| } |
| } |
| startAll(); |
| } |
| |
| // Step 4. Shut down old nameservices. This happens outside |
| // of the synchronized(this) lock since they need to call |
| // back to .remove() from another thread |
| if (!toRemove.isEmpty()) { |
| LOG.info("Stopping BPOfferServices for nameservices: " + |
| Joiner.on(",").useForNull("<default>").join(toRemove)); |
| |
| for (String nsToRemove : toRemove) { |
| BPOfferService bpos = bpByNameserviceId.get(nsToRemove); |
| bpos.stop(); |
| bpos.join(); |
| // they will call remove on their own |
| } |
| } |
| |
| // Step 5. Update nameservices whose NN list has changed |
| if (!toRefresh.isEmpty()) { |
| LOG.info("Refreshing list of NNs for nameservices: " + |
| Joiner.on(",").useForNull("<default>").join(toRefresh)); |
| |
| for (String nsToRefresh : toRefresh) { |
| BPOfferService bpos = bpByNameserviceId.get(nsToRefresh); |
| ArrayList<InetSocketAddress> addrs = |
| Lists.newArrayList(addrMap.get(nsToRefresh).values()); |
| bpos.refreshNNList(addrs); |
| } |
| } |
| } |
| |
| /** |
| * Extracted out for test purposes. |
| */ |
| protected BPOfferService createBPOS(List<InetSocketAddress> nnAddrs) { |
| return new BPOfferService(nnAddrs, dn); |
| } |
| } |