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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.hadoop.hbase;
19  
20  
21  import org.apache.commons.logging.Log;
22  import org.apache.commons.logging.LogFactory;
23  import org.apache.hadoop.conf.Configuration;
24  import org.apache.hadoop.hbase.catalog.CatalogTracker;
25  import org.apache.hadoop.hbase.executor.EventType;
26  import org.apache.hadoop.hbase.executor.ExecutorService;
27  import org.apache.hadoop.hbase.executor.ExecutorType;
28  import org.apache.hadoop.hbase.master.AssignmentManager;
29  import org.apache.hadoop.hbase.master.HMaster;
30  import org.apache.hadoop.hbase.master.LoadBalancer;
31  import org.apache.hadoop.hbase.master.RegionPlan;
32  import org.apache.hadoop.hbase.master.RegionState;
33  import org.apache.hadoop.hbase.master.ServerManager;
34  import org.apache.hadoop.hbase.master.balancer.LoadBalancerFactory;
35  import org.apache.hadoop.hbase.regionserver.RegionOpeningState;
36  import org.apache.hadoop.hbase.zookeeper.ZKAssign;
37  import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
38  import org.junit.AfterClass;
39  import org.junit.BeforeClass;
40  import org.junit.Test;
41  import org.junit.experimental.categories.Category;
42  import org.mockito.Mockito;
43  
44  import java.util.ArrayList;
45  import java.util.HashMap;
46  import java.util.HashSet;
47  import java.util.List;
48  import java.util.Map;
49  import java.util.Map.Entry;
50  import java.util.Set;
51  
52  import static org.junit.Assert.assertFalse;
53  import static org.junit.Assert.assertNotEquals;
54  import static org.junit.Assert.assertTrue;
55  
56  
57  /**
58   * Test the draining servers feature.
59   */
60  @Category(MediumTests.class)
61  public class TestDrainingServer {
62    private static final Log LOG = LogFactory.getLog(TestDrainingServer.class);
63    private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
64    private Abortable abortable = new Abortable() {
65      @Override
66      public boolean isAborted() {
67        return false;
68      }
69  
70      @Override
71      public void abort(String why, Throwable e) {
72      }
73    };
74  
75    @AfterClass
76    public static void afterClass() throws Exception {
77      TEST_UTIL.shutdownMiniZKCluster();
78    }
79    
80    @BeforeClass
81    public static void beforeClass() throws Exception {
82      TEST_UTIL.getConfiguration().setBoolean("hbase.assignment.usezk", true);
83      TEST_UTIL.startMiniZKCluster();
84    }
85  
86    @Test
87    public void testAssignmentManagerDoesntUseDrainingServer() throws Exception {
88      AssignmentManager am;
89      Configuration conf = TEST_UTIL.getConfiguration();
90      final HMaster master = Mockito.mock(HMaster.class);
91      final Server server = Mockito.mock(Server.class);
92      final ServerManager serverManager = Mockito.mock(ServerManager.class);
93      final ServerName SERVERNAME_A = ServerName.valueOf("mockserver_a.org", 1000, 8000);
94      final ServerName SERVERNAME_B = ServerName.valueOf("mockserver_b.org", 1001, 8000);
95      LoadBalancer balancer = LoadBalancerFactory.getLoadBalancer(conf);
96      CatalogTracker catalogTracker = Mockito.mock(CatalogTracker.class);
97      final HRegionInfo REGIONINFO = new HRegionInfo(TableName.valueOf("table_test"),
98          HConstants.EMPTY_START_ROW, HConstants.EMPTY_START_ROW);
99  
100     ZooKeeperWatcher zkWatcher = new ZooKeeperWatcher(TEST_UTIL.getConfiguration(),
101       "zkWatcher-Test", abortable, true);
102 
103     Map<ServerName, ServerLoad> onlineServers = new HashMap<ServerName, ServerLoad>();
104 
105     onlineServers.put(SERVERNAME_A, ServerLoad.EMPTY_SERVERLOAD);
106     onlineServers.put(SERVERNAME_B, ServerLoad.EMPTY_SERVERLOAD);
107 
108     Mockito.when(server.getConfiguration()).thenReturn(conf);
109     Mockito.when(server.getServerName()).thenReturn(ServerName.valueOf("masterMock,1,1"));
110     Mockito.when(server.getZooKeeper()).thenReturn(zkWatcher);
111 
112     Mockito.when(serverManager.getOnlineServers()).thenReturn(onlineServers);
113     Mockito.when(serverManager.getOnlineServersList())
114     .thenReturn(new ArrayList<ServerName>(onlineServers.keySet()));
115     
116     Mockito.when(serverManager.createDestinationServersList())
117         .thenReturn(new ArrayList<ServerName>(onlineServers.keySet()));
118     Mockito.when(serverManager.createDestinationServersList(null))
119         .thenReturn(new ArrayList<ServerName>(onlineServers.keySet()));
120     
121     for (ServerName sn : onlineServers.keySet()) {
122       Mockito.when(serverManager.isServerOnline(sn)).thenReturn(true);
123       Mockito.when(serverManager.sendRegionClose(sn, REGIONINFO, -1)).thenReturn(true);
124       Mockito.when(serverManager.sendRegionClose(sn, REGIONINFO, -1, null, false)).thenReturn(true);
125       Mockito.when(serverManager.sendRegionOpen(sn, REGIONINFO, -1, new ArrayList<ServerName>()))
126       .thenReturn(RegionOpeningState.OPENED);
127       Mockito.when(serverManager.sendRegionOpen(sn, REGIONINFO, -1, null))
128       .thenReturn(RegionOpeningState.OPENED);
129       Mockito.when(serverManager.addServerToDrainList(sn)).thenReturn(true);
130     }
131 
132     Mockito.when(master.getServerManager()).thenReturn(serverManager);
133 
134     am = new AssignmentManager(server, serverManager, catalogTracker,
135         balancer, startupMasterExecutor("mockExecutorService"), null, null);
136 
137     Mockito.when(master.getAssignmentManager()).thenReturn(am);
138     Mockito.when(master.getZooKeeperWatcher()).thenReturn(zkWatcher);
139     Mockito.when(master.getZooKeeper()).thenReturn(zkWatcher);
140     
141     am.addPlan(REGIONINFO.getEncodedName(), new RegionPlan(REGIONINFO, null, SERVERNAME_A));
142 
143     zkWatcher.registerListenerFirst(am);
144 
145     addServerToDrainedList(SERVERNAME_A, onlineServers, serverManager);
146 
147     am.assign(REGIONINFO, true);
148 
149     setRegionOpenedOnZK(zkWatcher, SERVERNAME_A, REGIONINFO);
150     setRegionOpenedOnZK(zkWatcher, SERVERNAME_B, REGIONINFO);
151 
152     am.waitForAssignment(REGIONINFO);
153 
154     assertTrue(am.getRegionStates().isRegionOnline(REGIONINFO));
155     assertNotEquals(am.getRegionStates().getRegionServerOfRegion(REGIONINFO), SERVERNAME_A);
156   }
157 
158   @Test
159   public void testAssignmentManagerDoesntUseDrainedServerWithBulkAssign() throws Exception {
160     Configuration conf = TEST_UTIL.getConfiguration();
161     LoadBalancer balancer = LoadBalancerFactory.getLoadBalancer(conf);
162     CatalogTracker catalogTracker = Mockito.mock(CatalogTracker.class);
163     AssignmentManager am;
164     final HMaster master = Mockito.mock(HMaster.class);
165     final Server server = Mockito.mock(Server.class);
166     final ServerManager serverManager = Mockito.mock(ServerManager.class);
167     final ServerName SERVERNAME_A = ServerName.valueOf("mockserverbulk_a.org", 1000, 8000);
168     final ServerName SERVERNAME_B = ServerName.valueOf("mockserverbulk_b.org", 1001, 8000);
169     final ServerName SERVERNAME_C = ServerName.valueOf("mockserverbulk_c.org", 1002, 8000);
170     final ServerName SERVERNAME_D = ServerName.valueOf("mockserverbulk_d.org", 1003, 8000);
171     final ServerName SERVERNAME_E = ServerName.valueOf("mockserverbulk_e.org", 1004, 8000);
172     final Map<HRegionInfo, ServerName> bulk = new HashMap<HRegionInfo, ServerName>();
173 
174     Set<ServerName> bunchServersAssigned = new HashSet<ServerName>();
175     
176     HRegionInfo REGIONINFO_A = new HRegionInfo(TableName.valueOf("table_A"),
177         HConstants.EMPTY_START_ROW, HConstants.EMPTY_START_ROW);
178     HRegionInfo REGIONINFO_B = new HRegionInfo(TableName.valueOf("table_B"),
179       HConstants.EMPTY_START_ROW, HConstants.EMPTY_START_ROW);
180     HRegionInfo REGIONINFO_C = new HRegionInfo(TableName.valueOf("table_C"),
181       HConstants.EMPTY_START_ROW, HConstants.EMPTY_START_ROW);
182     HRegionInfo REGIONINFO_D = new HRegionInfo(TableName.valueOf("table_D"),
183       HConstants.EMPTY_START_ROW, HConstants.EMPTY_START_ROW);
184     HRegionInfo REGIONINFO_E = new HRegionInfo(TableName.valueOf("table_E"),
185       HConstants.EMPTY_START_ROW, HConstants.EMPTY_START_ROW);
186 
187     Map<ServerName, ServerLoad> onlineServers = new HashMap<ServerName, ServerLoad>();
188     List<ServerName> drainedServers = new ArrayList<ServerName>();
189 
190     onlineServers.put(SERVERNAME_A, ServerLoad.EMPTY_SERVERLOAD);
191     onlineServers.put(SERVERNAME_B, ServerLoad.EMPTY_SERVERLOAD);
192     onlineServers.put(SERVERNAME_C, ServerLoad.EMPTY_SERVERLOAD);
193     onlineServers.put(SERVERNAME_D, ServerLoad.EMPTY_SERVERLOAD);
194     onlineServers.put(SERVERNAME_E, ServerLoad.EMPTY_SERVERLOAD);
195 
196     bulk.put(REGIONINFO_A, SERVERNAME_A);
197     bulk.put(REGIONINFO_B, SERVERNAME_B);
198     bulk.put(REGIONINFO_C, SERVERNAME_C);
199     bulk.put(REGIONINFO_D, SERVERNAME_D);
200     bulk.put(REGIONINFO_E, SERVERNAME_E);
201 
202     ZooKeeperWatcher zkWatcher = new ZooKeeperWatcher(TEST_UTIL.getConfiguration(),
203         "zkWatcher-BulkAssignTest", abortable, true);
204 
205     Mockito.when(server.getConfiguration()).thenReturn(conf);
206     Mockito.when(server.getServerName()).thenReturn(ServerName.valueOf("masterMock,1,1"));
207     Mockito.when(server.getZooKeeper()).thenReturn(zkWatcher);
208 
209     Mockito.when(serverManager.getOnlineServers()).thenReturn(onlineServers);
210     Mockito.when(serverManager.getOnlineServersList()).thenReturn(
211       new ArrayList<ServerName>(onlineServers.keySet()));
212     
213     Mockito.when(serverManager.createDestinationServersList()).thenReturn(
214       new ArrayList<ServerName>(onlineServers.keySet()));
215     Mockito.when(serverManager.createDestinationServersList(null)).thenReturn(
216       new ArrayList<ServerName>(onlineServers.keySet()));
217     
218     for (Entry<HRegionInfo, ServerName> entry : bulk.entrySet()) {
219       Mockito.when(serverManager.isServerOnline(entry.getValue())).thenReturn(true);
220       Mockito.when(serverManager.sendRegionClose(entry.getValue(), 
221         entry.getKey(), -1)).thenReturn(true);
222       Mockito.when(serverManager.sendRegionOpen(entry.getValue(), 
223         entry.getKey(), -1, null)).thenReturn(RegionOpeningState.OPENED);  
224       Mockito.when(serverManager.addServerToDrainList(entry.getValue())).thenReturn(true);
225     }
226     
227     Mockito.when(master.getServerManager()).thenReturn(serverManager);
228 
229     drainedServers.add(SERVERNAME_A);
230     drainedServers.add(SERVERNAME_B);
231     drainedServers.add(SERVERNAME_C);
232     drainedServers.add(SERVERNAME_D);
233 
234     am = new AssignmentManager(server, serverManager, catalogTracker,
235       balancer, startupMasterExecutor("mockExecutorServiceBulk"), null, null);
236     
237     Mockito.when(master.getAssignmentManager()).thenReturn(am);
238 
239     zkWatcher.registerListener(am);
240     
241     for (ServerName drained : drainedServers) {
242       addServerToDrainedList(drained, onlineServers, serverManager);
243     }
244     
245     am.assign(bulk);
246 
247     Map<String, RegionState> regionsInTransition = am.getRegionStates().getRegionsInTransition();
248     for (Entry<String, RegionState> entry : regionsInTransition.entrySet()) {
249       setRegionOpenedOnZK(zkWatcher, entry.getValue().getServerName(), 
250         entry.getValue().getRegion());
251     }
252     
253     am.waitForAssignment(REGIONINFO_A);
254     am.waitForAssignment(REGIONINFO_B);
255     am.waitForAssignment(REGIONINFO_C);
256     am.waitForAssignment(REGIONINFO_D);
257     am.waitForAssignment(REGIONINFO_E);
258     
259     Map<HRegionInfo, ServerName> regionAssignments = am.getRegionStates().getRegionAssignments();
260     for (Entry<HRegionInfo, ServerName> entry : regionAssignments.entrySet()) {
261       LOG.info("Region Assignment: " 
262           + entry.getKey().getRegionNameAsString() + " Server: " + entry.getValue());
263       bunchServersAssigned.add(entry.getValue());
264     }
265     
266     for (ServerName sn : drainedServers) {
267       assertFalse(bunchServersAssigned.contains(sn));
268     }
269   }
270 
271   private void addServerToDrainedList(ServerName serverName, 
272       Map<ServerName, ServerLoad> onlineServers, ServerManager serverManager) {
273     onlineServers.remove(serverName);
274     List<ServerName> availableServers = new ArrayList<ServerName>(onlineServers.keySet());
275     Mockito.when(serverManager.createDestinationServersList()).thenReturn(availableServers);
276     Mockito.when(serverManager.createDestinationServersList(null)).thenReturn(availableServers);
277   }
278 
279   private void setRegionOpenedOnZK(final ZooKeeperWatcher zkWatcher, final ServerName serverName,
280                                    HRegionInfo hregionInfo) throws Exception {
281     int version = ZKAssign.getVersion(zkWatcher, hregionInfo);
282     int versionTransition = ZKAssign.transitionNode(zkWatcher,
283         hregionInfo, serverName, EventType.M_ZK_REGION_OFFLINE,
284         EventType.RS_ZK_REGION_OPENING, version);
285     ZKAssign.transitionNodeOpened(zkWatcher, hregionInfo, serverName, versionTransition);
286   }
287 
288   private ExecutorService startupMasterExecutor(final String name) {
289     ExecutorService executor = new ExecutorService(name);
290     executor.startExecutorService(ExecutorType.MASTER_OPEN_REGION, 3);
291     executor.startExecutorService(ExecutorType.MASTER_CLOSE_REGION, 3);
292     executor.startExecutorService(ExecutorType.MASTER_SERVER_OPERATIONS, 3);
293     executor.startExecutorService(ExecutorType.MASTER_META_SERVER_OPERATIONS, 3);
294     return executor;
295   }
296 }