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18 package org.apache.hadoop.hbase.regionserver.snapshot;
19
20 import java.io.IOException;
21 import java.util.ArrayList;
22 import java.util.Collection;
23 import java.util.List;
24 import java.util.concurrent.Callable;
25 import java.util.concurrent.ExecutionException;
26 import java.util.concurrent.ExecutorCompletionService;
27 import java.util.concurrent.Future;
28 import java.util.concurrent.LinkedBlockingQueue;
29 import java.util.concurrent.ThreadPoolExecutor;
30 import java.util.concurrent.TimeUnit;
31
32 import org.apache.commons.logging.Log;
33 import org.apache.commons.logging.LogFactory;
34 import org.apache.hadoop.classification.InterfaceAudience;
35 import org.apache.hadoop.classification.InterfaceStability;
36 import org.apache.hadoop.conf.Configuration;
37 import org.apache.hadoop.hbase.DaemonThreadFactory;
38 import org.apache.hadoop.hbase.TableName;
39 import org.apache.hadoop.hbase.errorhandling.ForeignException;
40 import org.apache.hadoop.hbase.errorhandling.ForeignExceptionDispatcher;
41 import org.apache.hadoop.hbase.master.snapshot.MasterSnapshotVerifier;
42 import org.apache.hadoop.hbase.master.snapshot.SnapshotManager;
43 import org.apache.hadoop.hbase.procedure.ProcedureMember;
44 import org.apache.hadoop.hbase.procedure.ProcedureMemberRpcs;
45 import org.apache.hadoop.hbase.procedure.RegionServerProcedureManager;
46 import org.apache.hadoop.hbase.procedure.Subprocedure;
47 import org.apache.hadoop.hbase.procedure.SubprocedureFactory;
48 import org.apache.hadoop.hbase.procedure.ZKProcedureMemberRpcs;
49 import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription;
50 import org.apache.hadoop.hbase.regionserver.HRegion;
51 import org.apache.hadoop.hbase.regionserver.HRegionServer;
52 import org.apache.hadoop.hbase.regionserver.RegionServerServices;
53 import org.apache.hadoop.hbase.snapshot.SnapshotCreationException;
54 import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
55 import org.apache.zookeeper.KeeperException;
56
57 import com.google.protobuf.InvalidProtocolBufferException;
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71
72 @InterfaceAudience.Private
73 @InterfaceStability.Unstable
74 public class RegionServerSnapshotManager extends RegionServerProcedureManager {
75 private static final Log LOG = LogFactory.getLog(RegionServerSnapshotManager.class);
76
77
78 private static final String CONCURENT_SNAPSHOT_TASKS_KEY = "hbase.snapshot.region.concurrentTasks";
79 private static final int DEFAULT_CONCURRENT_SNAPSHOT_TASKS = 3;
80
81
82 public static final String SNAPSHOT_REQUEST_THREADS_KEY = "hbase.snapshot.region.pool.threads";
83
84 public static final int SNAPSHOT_REQUEST_THREADS_DEFAULT = 10;
85
86
87 public static final String SNAPSHOT_TIMEOUT_MILLIS_KEY = "hbase.snapshot.region.timeout";
88
89 public static final long SNAPSHOT_TIMEOUT_MILLIS_DEFAULT = 60000;
90
91
92 public static final String SNAPSHOT_REQUEST_WAKE_MILLIS_KEY = "hbase.snapshot.region.wakefrequency";
93
94 private static final long SNAPSHOT_REQUEST_WAKE_MILLIS_DEFAULT = 500;
95
96 private RegionServerServices rss;
97 private ProcedureMemberRpcs memberRpcs;
98 private ProcedureMember member;
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107 RegionServerSnapshotManager(Configuration conf, HRegionServer parent,
108 ProcedureMemberRpcs memberRpc, ProcedureMember procMember) {
109 this.rss = parent;
110 this.memberRpcs = memberRpc;
111 this.member = procMember;
112 }
113
114 public RegionServerSnapshotManager() {}
115
116
117
118
119 @Override
120 public void start() {
121 LOG.debug("Start Snapshot Manager " + rss.getServerName().toString());
122 this.memberRpcs.start(rss.getServerName().toString(), member);
123 }
124
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128
129
130 @Override
131 public void stop(boolean force) throws IOException {
132 String mode = force ? "abruptly" : "gracefully";
133 LOG.info("Stopping RegionServerSnapshotManager " + mode + ".");
134
135 try {
136 this.member.close();
137 } finally {
138 this.memberRpcs.close();
139 }
140 }
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151
152 public Subprocedure buildSubprocedure(SnapshotDescription snapshot) {
153
154
155 if (rss.isStopping() || rss.isStopped()) {
156 throw new IllegalStateException("Can't start snapshot on RS: " + rss.getServerName()
157 + ", because stopping/stopped!");
158 }
159
160
161
162 List<HRegion> involvedRegions;
163 try {
164 involvedRegions = getRegionsToSnapshot(snapshot);
165 } catch (IOException e1) {
166 throw new IllegalStateException("Failed to figure out if we should handle a snapshot - "
167 + "something has gone awry with the online regions.", e1);
168 }
169
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174 LOG.debug("Launching subprocedure for snapshot " + snapshot.getName() + " from table "
175 + snapshot.getTable());
176 ForeignExceptionDispatcher exnDispatcher = new ForeignExceptionDispatcher(snapshot.getName());
177 Configuration conf = rss.getConfiguration();
178 long timeoutMillis = conf.getLong(SNAPSHOT_TIMEOUT_MILLIS_KEY,
179 SNAPSHOT_TIMEOUT_MILLIS_DEFAULT);
180 long wakeMillis = conf.getLong(SNAPSHOT_REQUEST_WAKE_MILLIS_KEY,
181 SNAPSHOT_REQUEST_WAKE_MILLIS_DEFAULT);
182
183 switch (snapshot.getType()) {
184 case FLUSH:
185 SnapshotSubprocedurePool taskManager =
186 new SnapshotSubprocedurePool(rss.getServerName().toString(), conf);
187 return new FlushSnapshotSubprocedure(member, exnDispatcher, wakeMillis,
188 timeoutMillis, involvedRegions, snapshot, taskManager);
189 case SKIPFLUSH:
190
191
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193
194
195
196
197 SnapshotSubprocedurePool taskManager2 =
198 new SnapshotSubprocedurePool(rss.getServerName().toString(), conf);
199 return new FlushSnapshotSubprocedure(member, exnDispatcher, wakeMillis,
200 timeoutMillis, involvedRegions, snapshot, taskManager2);
201
202 default:
203 throw new UnsupportedOperationException("Unrecognized snapshot type:" + snapshot.getType());
204 }
205 }
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222 private List<HRegion> getRegionsToSnapshot(SnapshotDescription snapshot) throws IOException {
223 return rss.getOnlineRegions(TableName.valueOf(snapshot.getTable()));
224 }
225
226
227
228
229 public class SnapshotSubprocedureBuilder implements SubprocedureFactory {
230
231 @Override
232 public Subprocedure buildSubprocedure(String name, byte[] data) {
233 try {
234
235 SnapshotDescription snapshot = SnapshotDescription.parseFrom(data);
236 return RegionServerSnapshotManager.this.buildSubprocedure(snapshot);
237 } catch (InvalidProtocolBufferException e) {
238 throw new IllegalArgumentException("Could not read snapshot information from request.");
239 }
240 }
241
242 }
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256
257 static class SnapshotSubprocedurePool {
258 private final ExecutorCompletionService<Void> taskPool;
259 private final ThreadPoolExecutor executor;
260 private volatile boolean stopped;
261 private final List<Future<Void>> futures = new ArrayList<Future<Void>>();
262 private final String name;
263
264 SnapshotSubprocedurePool(String name, Configuration conf) {
265
266 long keepAlive = conf.getLong(
267 RegionServerSnapshotManager.SNAPSHOT_TIMEOUT_MILLIS_KEY,
268 RegionServerSnapshotManager.SNAPSHOT_TIMEOUT_MILLIS_DEFAULT);
269 int threads = conf.getInt(CONCURENT_SNAPSHOT_TASKS_KEY, DEFAULT_CONCURRENT_SNAPSHOT_TASKS);
270 this.name = name;
271 executor = new ThreadPoolExecutor(1, threads, keepAlive, TimeUnit.MILLISECONDS,
272 new LinkedBlockingQueue<Runnable>(), new DaemonThreadFactory("rs("
273 + name + ")-snapshot-pool"));
274 taskPool = new ExecutorCompletionService<Void>(executor);
275 }
276
277 boolean hasTasks() {
278 return futures.size() != 0;
279 }
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286
287 void submitTask(final Callable<Void> task) {
288 Future<Void> f = this.taskPool.submit(task);
289 futures.add(f);
290 }
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299
300 boolean waitForOutstandingTasks() throws ForeignException, InterruptedException {
301 LOG.debug("Waiting for local region snapshots to finish.");
302
303 int sz = futures.size();
304 try {
305
306 for (int i = 0; i < sz; i++) {
307 Future<Void> f = taskPool.take();
308 f.get();
309 if (!futures.remove(f)) {
310 LOG.warn("unexpected future" + f);
311 }
312 LOG.debug("Completed " + (i+1) + "/" + sz + " local region snapshots.");
313 }
314 LOG.debug("Completed " + sz + " local region snapshots.");
315 return true;
316 } catch (InterruptedException e) {
317 LOG.warn("Got InterruptedException in SnapshotSubprocedurePool", e);
318 if (!stopped) {
319 Thread.currentThread().interrupt();
320 throw new ForeignException("SnapshotSubprocedurePool", e);
321 }
322
323 } catch (ExecutionException e) {
324 if (e.getCause() instanceof ForeignException) {
325 LOG.warn("Rethrowing ForeignException from SnapshotSubprocedurePool", e);
326 throw (ForeignException)e.getCause();
327 }
328 LOG.warn("Got Exception in SnapshotSubprocedurePool", e);
329 throw new ForeignException(name, e.getCause());
330 } finally {
331 cancelTasks();
332 }
333 return false;
334 }
335
336
337
338
339
340 void cancelTasks() throws InterruptedException {
341 Collection<Future<Void>> tasks = futures;
342 LOG.debug("cancelling " + tasks.size() + " tasks for snapshot " + name);
343 for (Future<Void> f: tasks) {
344
345
346
347
348 f.cancel(false);
349 }
350
351
352 futures.clear();
353 while (taskPool.poll() != null) {}
354 stop();
355 }
356
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359
360 void stop() {
361 if (this.stopped) return;
362
363 this.stopped = true;
364 this.executor.shutdownNow();
365 }
366 }
367
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371
372
373 @Override
374 public void initialize(RegionServerServices rss) throws KeeperException {
375 this.rss = rss;
376 ZooKeeperWatcher zkw = rss.getZooKeeper();
377 this.memberRpcs = new ZKProcedureMemberRpcs(zkw,
378 SnapshotManager.ONLINE_SNAPSHOT_CONTROLLER_DESCRIPTION);
379
380
381 Configuration conf = rss.getConfiguration();
382 long keepAlive = conf.getLong(SNAPSHOT_TIMEOUT_MILLIS_KEY, SNAPSHOT_TIMEOUT_MILLIS_DEFAULT);
383 int opThreads = conf.getInt(SNAPSHOT_REQUEST_THREADS_KEY, SNAPSHOT_REQUEST_THREADS_DEFAULT);
384
385
386 ThreadPoolExecutor pool = ProcedureMember.defaultPool(rss.getServerName().toString(),
387 opThreads, keepAlive);
388 this.member = new ProcedureMember(memberRpcs, pool, new SnapshotSubprocedureBuilder());
389 }
390
391 @Override
392 public String getProcedureSignature() {
393 return SnapshotManager.ONLINE_SNAPSHOT_CONTROLLER_DESCRIPTION;
394 }
395
396 }