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19 package org.apache.hadoop.hbase.regionserver;
20
21 import static org.junit.Assert.assertEquals;
22 import static org.junit.Assert.assertFalse;
23 import static org.junit.Assert.assertTrue;
24 import static org.junit.Assert.fail;
25
26 import java.io.IOException;
27 import java.util.List;
28
29 import org.apache.commons.lang.math.RandomUtils;
30 import org.apache.commons.logging.Log;
31 import org.apache.commons.logging.LogFactory;
32 import org.apache.hadoop.fs.FileSystem;
33 import org.apache.hadoop.fs.Path;
34 import org.apache.hadoop.hbase.TableName;
35 import org.apache.hadoop.hbase.HBaseTestingUtility;
36 import org.apache.hadoop.hbase.HConstants;
37 import org.apache.hadoop.hbase.HRegionInfo;
38 import org.apache.hadoop.hbase.HTableDescriptor;
39 import org.apache.hadoop.hbase.LargeTests;
40 import org.apache.hadoop.hbase.MiniHBaseCluster;
41 import org.apache.hadoop.hbase.ServerName;
42 import org.apache.hadoop.hbase.UnknownRegionException;
43 import org.apache.hadoop.hbase.catalog.MetaReader;
44 import org.apache.hadoop.hbase.client.HBaseAdmin;
45 import org.apache.hadoop.hbase.client.HTable;
46 import org.apache.hadoop.hbase.client.Put;
47 import org.apache.hadoop.hbase.client.Result;
48 import org.apache.hadoop.hbase.client.ResultScanner;
49 import org.apache.hadoop.hbase.client.Scan;
50 import org.apache.hadoop.hbase.exceptions.MergeRegionException;
51 import org.apache.hadoop.hbase.master.AssignmentManager;
52 import org.apache.hadoop.hbase.master.HMaster;
53 import org.apache.hadoop.hbase.master.RegionState.State;
54 import org.apache.hadoop.hbase.master.RegionStates;
55 import org.apache.hadoop.hbase.util.Bytes;
56 import org.apache.hadoop.hbase.util.FSUtils;
57 import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
58 import org.apache.hadoop.hbase.util.Pair;
59 import org.apache.hadoop.hbase.util.PairOfSameType;
60 import org.junit.AfterClass;
61 import org.junit.BeforeClass;
62 import org.junit.Test;
63 import org.junit.experimental.categories.Category;
64
65 import com.google.common.base.Joiner;
66
67
68
69
70
71
72
73 @Category(LargeTests.class)
74 public class TestRegionMergeTransactionOnCluster {
75 private static final Log LOG = LogFactory
76 .getLog(TestRegionMergeTransactionOnCluster.class);
77 private static final int NB_SERVERS = 3;
78
79 private static final byte[] FAMILYNAME = Bytes.toBytes("fam");
80 private static final byte[] QUALIFIER = Bytes.toBytes("q");
81
82 private static byte[] ROW = Bytes.toBytes("testRow");
83 private static final int INITIAL_REGION_NUM = 10;
84 private static final int ROWSIZE = 200;
85 private static byte[][] ROWS = makeN(ROW, ROWSIZE);
86
87 private static int waitTime = 60 * 1000;
88
89 private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
90
91 private static HMaster master;
92 private static HBaseAdmin admin;
93
94 @BeforeClass
95 public static void beforeAllTests() throws Exception {
96
97 TEST_UTIL.startMiniCluster(NB_SERVERS);
98 MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
99 master = cluster.getMaster();
100 master.balanceSwitch(false);
101 admin = TEST_UTIL.getHBaseAdmin();
102 }
103
104 @AfterClass
105 public static void afterAllTests() throws Exception {
106 TEST_UTIL.shutdownMiniCluster();
107 }
108
109 @Test
110 public void testWholesomeMerge() throws Exception {
111 LOG.info("Starting testWholesomeMerge");
112 final TableName tableName =
113 TableName.valueOf("testWholesomeMerge");
114
115
116 HTable table = createTableAndLoadData(master, tableName);
117
118 mergeRegionsAndVerifyRegionNum(master, tableName, 0, 1,
119 INITIAL_REGION_NUM - 1);
120
121
122 PairOfSameType<HRegionInfo> mergedRegions =
123 mergeRegionsAndVerifyRegionNum(master, tableName, 1, 2,
124 INITIAL_REGION_NUM - 2);
125
126 verifyRowCount(table, ROWSIZE);
127
128
129 HRegionInfo hri = RandomUtils.nextBoolean() ?
130 mergedRegions.getFirst() : mergedRegions.getSecond();
131 MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
132 AssignmentManager am = cluster.getMaster().getAssignmentManager();
133 RegionStates regionStates = am.getRegionStates();
134 long start = EnvironmentEdgeManager.currentTimeMillis();
135 while (!regionStates.isRegionInState(hri, State.MERGED)) {
136 assertFalse("Timed out in waiting one merged region to be in state MERGED",
137 EnvironmentEdgeManager.currentTimeMillis() - start > 60000);
138 Thread.sleep(500);
139 }
140
141
142 am.assign(hri, true, true);
143 assertFalse("Merged region should not be in transition again",
144 regionStates.isRegionInTransition(hri)
145 && regionStates.isRegionInState(hri, State.MERGED));
146
147 table.close();
148 }
149
150 @Test
151 public void testCleanMergeReference() throws Exception {
152 LOG.info("Starting testCleanMergeReference");
153 admin.enableCatalogJanitor(false);
154 try {
155 final TableName tableName =
156 TableName.valueOf("testCleanMergeReference");
157
158 HTable table = createTableAndLoadData(master, tableName);
159
160 mergeRegionsAndVerifyRegionNum(master, tableName, 0, 1,
161 INITIAL_REGION_NUM - 1);
162 verifyRowCount(table, ROWSIZE);
163 table.close();
164
165 List<Pair<HRegionInfo, ServerName>> tableRegions = MetaReader
166 .getTableRegionsAndLocations(master.getCatalogTracker(),
167 tableName);
168 HRegionInfo mergedRegionInfo = tableRegions.get(0).getFirst();
169 HTableDescriptor tableDescritor = master.getTableDescriptors().get(
170 tableName);
171 Result mergedRegionResult = MetaReader.getRegionResult(
172 master.getCatalogTracker(), mergedRegionInfo.getRegionName());
173
174
175 assertTrue(mergedRegionResult.getValue(HConstants.CATALOG_FAMILY,
176 HConstants.MERGEA_QUALIFIER) != null);
177 assertTrue(mergedRegionResult.getValue(HConstants.CATALOG_FAMILY,
178 HConstants.MERGEB_QUALIFIER) != null);
179
180
181 HRegionInfo regionA = HRegionInfo.getHRegionInfo(mergedRegionResult,
182 HConstants.MERGEA_QUALIFIER);
183 HRegionInfo regionB = HRegionInfo.getHRegionInfo(mergedRegionResult,
184 HConstants.MERGEB_QUALIFIER);
185 FileSystem fs = master.getMasterFileSystem().getFileSystem();
186 Path rootDir = master.getMasterFileSystem().getRootDir();
187
188 Path tabledir = FSUtils.getTableDir(rootDir, mergedRegionInfo.getTableName());
189 Path regionAdir = new Path(tabledir, regionA.getEncodedName());
190 Path regionBdir = new Path(tabledir, regionB.getEncodedName());
191 assertTrue(fs.exists(regionAdir));
192 assertTrue(fs.exists(regionBdir));
193
194 admin.compact(mergedRegionInfo.getRegionName());
195
196 long timeout = System.currentTimeMillis() + waitTime;
197 HRegionFileSystem hrfs = new HRegionFileSystem(
198 TEST_UTIL.getConfiguration(), fs, tabledir, mergedRegionInfo);
199 while (System.currentTimeMillis() < timeout) {
200 if (!hrfs.hasReferences(tableDescritor)) {
201 break;
202 }
203 Thread.sleep(50);
204 }
205 assertFalse(hrfs.hasReferences(tableDescritor));
206
207
208
209 int cleaned = admin.runCatalogScan();
210 assertTrue(cleaned > 0);
211 assertFalse(fs.exists(regionAdir));
212 assertFalse(fs.exists(regionBdir));
213
214 mergedRegionResult = MetaReader.getRegionResult(
215 master.getCatalogTracker(), mergedRegionInfo.getRegionName());
216 assertFalse(mergedRegionResult.getValue(HConstants.CATALOG_FAMILY,
217 HConstants.MERGEA_QUALIFIER) != null);
218 assertFalse(mergedRegionResult.getValue(HConstants.CATALOG_FAMILY,
219 HConstants.MERGEB_QUALIFIER) != null);
220
221 } finally {
222 admin.enableCatalogJanitor(true);
223 }
224 }
225
226
227
228
229
230
231
232 @Test
233 public void testMerge() throws Exception {
234 LOG.info("Starting testMerge");
235 final TableName tableName = TableName.valueOf("testMerge");
236
237 try {
238
239 HTable table = createTableAndLoadData(master, tableName);
240 RegionStates regionStates = master.getAssignmentManager().getRegionStates();
241 List<HRegionInfo> regions = regionStates.getRegionsOfTable(tableName);
242
243 HRegionInfo a = regions.get(0);
244 HRegionInfo b = regions.get(1);
245 regionStates.regionOffline(a);
246 try {
247
248 admin.mergeRegions(a.getEncodedNameAsBytes(), b.getEncodedNameAsBytes(), false);
249 fail("Offline regions should not be able to merge");
250 } catch (IOException ie) {
251 assertTrue("Exception should mention regions not online",
252 ie.getMessage().contains("regions not online")
253 && ie instanceof MergeRegionException);
254 }
255 try {
256
257 admin.mergeRegions(b.getEncodedNameAsBytes(), b.getEncodedNameAsBytes(), true);
258 fail("A region should not be able to merge with itself, even forcifully");
259 } catch (IOException ie) {
260 assertTrue("Exception should mention regions not online",
261 ie.getMessage().contains("region to itself")
262 && ie instanceof MergeRegionException);
263 }
264 try {
265
266 admin.mergeRegions(Bytes.toBytes("-f1"), Bytes.toBytes("-f2"), true);
267 fail("Unknown region could not be merged");
268 } catch (IOException ie) {
269 assertTrue("UnknownRegionException should be thrown",
270 ie instanceof UnknownRegionException);
271 }
272 table.close();
273 } finally {
274 TEST_UTIL.deleteTable(tableName);
275 }
276 }
277
278 private PairOfSameType<HRegionInfo> mergeRegionsAndVerifyRegionNum(
279 HMaster master, TableName tablename,
280 int regionAnum, int regionBnum, int expectedRegionNum) throws Exception {
281 PairOfSameType<HRegionInfo> mergedRegions =
282 requestMergeRegion(master, tablename, regionAnum, regionBnum);
283 waitAndVerifyRegionNum(master, tablename, expectedRegionNum);
284 return mergedRegions;
285 }
286
287 private PairOfSameType<HRegionInfo> requestMergeRegion(
288 HMaster master, TableName tablename,
289 int regionAnum, int regionBnum) throws Exception {
290 List<Pair<HRegionInfo, ServerName>> tableRegions = MetaReader
291 .getTableRegionsAndLocations(master.getCatalogTracker(),
292 tablename);
293 HRegionInfo regionA = tableRegions.get(regionAnum).getFirst();
294 HRegionInfo regionB = tableRegions.get(regionBnum).getFirst();
295 TEST_UTIL.getHBaseAdmin().mergeRegions(
296 regionA.getEncodedNameAsBytes(),
297 regionB.getEncodedNameAsBytes(), false);
298 return new PairOfSameType<HRegionInfo>(regionA, regionB);
299 }
300
301 private void waitAndVerifyRegionNum(HMaster master, TableName tablename,
302 int expectedRegionNum) throws Exception {
303 List<Pair<HRegionInfo, ServerName>> tableRegionsInMeta;
304 List<HRegionInfo> tableRegionsInMaster;
305 long timeout = System.currentTimeMillis() + waitTime;
306 while (System.currentTimeMillis() < timeout) {
307 tableRegionsInMeta = MetaReader.getTableRegionsAndLocations(
308 master.getCatalogTracker(), tablename);
309 tableRegionsInMaster = master.getAssignmentManager().getRegionStates()
310 .getRegionsOfTable(tablename);
311 if (tableRegionsInMeta.size() == expectedRegionNum
312 && tableRegionsInMaster.size() == expectedRegionNum) {
313 break;
314 }
315 Thread.sleep(250);
316 }
317
318 tableRegionsInMeta = MetaReader.getTableRegionsAndLocations(
319 master.getCatalogTracker(), tablename);
320 LOG.info("Regions after merge:" + Joiner.on(',').join(tableRegionsInMeta));
321 assertEquals(expectedRegionNum, tableRegionsInMeta.size());
322 }
323
324 private HTable createTableAndLoadData(HMaster master, TableName tablename)
325 throws Exception {
326 return createTableAndLoadData(master, tablename, INITIAL_REGION_NUM);
327 }
328
329 private HTable createTableAndLoadData(HMaster master, TableName tablename,
330 int numRegions) throws Exception {
331 assertTrue("ROWSIZE must > numregions:" + numRegions, ROWSIZE > numRegions);
332 byte[][] splitRows = new byte[numRegions - 1][];
333 for (int i = 0; i < splitRows.length; i++) {
334 splitRows[i] = ROWS[(i + 1) * ROWSIZE / numRegions];
335 }
336
337 HTable table = TEST_UTIL.createTable(tablename, FAMILYNAME, splitRows);
338 loadData(table);
339 verifyRowCount(table, ROWSIZE);
340
341
342 long timeout = System.currentTimeMillis() + waitTime;
343 List<Pair<HRegionInfo, ServerName>> tableRegions;
344 while (System.currentTimeMillis() < timeout) {
345 tableRegions = MetaReader.getTableRegionsAndLocations(
346 master.getCatalogTracker(), tablename);
347 if (tableRegions.size() == numRegions)
348 break;
349 Thread.sleep(250);
350 }
351
352 tableRegions = MetaReader.getTableRegionsAndLocations(
353 master.getCatalogTracker(), tablename);
354 LOG.info("Regions after load: " + Joiner.on(',').join(tableRegions));
355 assertEquals(numRegions, tableRegions.size());
356 return table;
357 }
358
359 private static byte[][] makeN(byte[] base, int n) {
360 byte[][] ret = new byte[n][];
361 for (int i = 0; i < n; i++) {
362 ret[i] = Bytes.add(base, Bytes.toBytes(String.format("%04d", i)));
363 }
364 return ret;
365 }
366
367 private void loadData(HTable table) throws IOException {
368 for (int i = 0; i < ROWSIZE; i++) {
369 Put put = new Put(ROWS[i]);
370 put.add(FAMILYNAME, QUALIFIER, Bytes.toBytes(i));
371 table.put(put);
372 }
373 }
374
375 private void verifyRowCount(HTable table, int expectedRegionNum)
376 throws IOException {
377 ResultScanner scanner = table.getScanner(new Scan());
378 int rowCount = 0;
379 while (scanner.next() != null) {
380 rowCount++;
381 }
382 assertEquals(expectedRegionNum, rowCount);
383 scanner.close();
384 }
385 }
386