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20 package org.apache.hadoop.hbase.master.snapshot;
21
22 import java.io.IOException;
23 import java.util.List;
24 import java.util.concurrent.CancellationException;
25
26 import org.apache.commons.logging.Log;
27 import org.apache.commons.logging.LogFactory;
28 import org.apache.hadoop.classification.InterfaceAudience;
29 import org.apache.hadoop.fs.FileSystem;
30 import org.apache.hadoop.fs.Path;
31 import org.apache.hadoop.hbase.TableName;
32 import org.apache.hadoop.hbase.HRegionInfo;
33 import org.apache.hadoop.hbase.HTableDescriptor;
34 import org.apache.hadoop.hbase.NotAllMetaRegionsOnlineException;
35 import org.apache.hadoop.hbase.TableExistsException;
36 import org.apache.hadoop.hbase.catalog.CatalogTracker;
37 import org.apache.hadoop.hbase.errorhandling.ForeignException;
38 import org.apache.hadoop.hbase.errorhandling.ForeignExceptionDispatcher;
39 import org.apache.hadoop.hbase.master.MasterServices;
40 import org.apache.hadoop.hbase.master.MetricsSnapshot;
41 import org.apache.hadoop.hbase.master.SnapshotSentinel;
42 import org.apache.hadoop.hbase.master.handler.CreateTableHandler;
43 import org.apache.hadoop.hbase.monitoring.MonitoredTask;
44 import org.apache.hadoop.hbase.monitoring.TaskMonitor;
45 import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription;
46 import org.apache.hadoop.hbase.snapshot.ClientSnapshotDescriptionUtils;
47 import org.apache.hadoop.hbase.snapshot.RestoreSnapshotException;
48 import org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper;
49 import org.apache.hadoop.hbase.snapshot.SnapshotDescriptionUtils;
50
51 import com.google.common.base.Preconditions;
52
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58
59 @InterfaceAudience.Private
60 public class CloneSnapshotHandler extends CreateTableHandler implements SnapshotSentinel {
61 private static final Log LOG = LogFactory.getLog(CloneSnapshotHandler.class);
62
63 private final static String NAME = "Master CloneSnapshotHandler";
64
65 private final SnapshotDescription snapshot;
66
67 private final ForeignExceptionDispatcher monitor;
68 private final MetricsSnapshot metricsSnapshot = new MetricsSnapshot();
69 private final MonitoredTask status;
70
71 private RestoreSnapshotHelper.RestoreMetaChanges metaChanges;
72
73 private volatile boolean stopped = false;
74
75 public CloneSnapshotHandler(final MasterServices masterServices,
76 final SnapshotDescription snapshot, final HTableDescriptor hTableDescriptor) {
77 super(masterServices, masterServices.getMasterFileSystem(), hTableDescriptor,
78 masterServices.getConfiguration(), null, masterServices);
79
80
81 this.snapshot = snapshot;
82
83
84 this.monitor = new ForeignExceptionDispatcher();
85 this.status = TaskMonitor.get().createStatus("Cloning snapshot '" + snapshot.getName() +
86 "' to table " + hTableDescriptor.getTableName());
87 }
88
89 @Override
90 public CloneSnapshotHandler prepare() throws NotAllMetaRegionsOnlineException,
91 TableExistsException, IOException {
92 return (CloneSnapshotHandler) super.prepare();
93 }
94
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98
99
100 @Override
101 protected List<HRegionInfo> handleCreateHdfsRegions(final Path tableRootDir,
102 final TableName tableName) throws IOException {
103 status.setStatus("Creating regions for table: " + tableName);
104 FileSystem fs = fileSystemManager.getFileSystem();
105 Path rootDir = fileSystemManager.getRootDir();
106
107 try {
108
109 Path snapshotDir = SnapshotDescriptionUtils.getCompletedSnapshotDir(snapshot, rootDir);
110 RestoreSnapshotHelper restoreHelper = new RestoreSnapshotHelper(conf, fs,
111 snapshot, snapshotDir, hTableDescriptor, tableRootDir, monitor, status);
112 metaChanges = restoreHelper.restoreHdfsRegions();
113
114
115 Preconditions.checkArgument(!metaChanges.hasRegionsToRestore(),
116 "A clone should not have regions to restore");
117 Preconditions.checkArgument(!metaChanges.hasRegionsToRemove(),
118 "A clone should not have regions to remove");
119
120
121 String msg = "Clone snapshot="+ snapshot.getName() +" on table=" + tableName + " completed!";
122 LOG.info(msg);
123 status.setStatus(msg + " Waiting for table to be enabled...");
124
125
126 return metaChanges.getRegionsToAdd();
127 } catch (Exception e) {
128 String msg = "clone snapshot=" + ClientSnapshotDescriptionUtils.toString(snapshot) +
129 " failed because " + e.getMessage();
130 LOG.error(msg, e);
131 IOException rse = new RestoreSnapshotException(msg, e, snapshot);
132
133
134 this.monitor.receive(new ForeignException(NAME, rse));
135 throw rse;
136 }
137 }
138
139 @Override
140 protected void addRegionsToMeta(final CatalogTracker ct, final List<HRegionInfo> regionInfos)
141 throws IOException {
142 super.addRegionsToMeta(ct, regionInfos);
143 metaChanges.updateMetaParentRegions(ct, regionInfos);
144 }
145
146 @Override
147 protected void completed(final Throwable exception) {
148 this.stopped = true;
149 if (exception != null) {
150 status.abort("Snapshot '" + snapshot.getName() + "' clone failed because " +
151 exception.getMessage());
152 } else {
153 status.markComplete("Snapshot '"+ snapshot.getName() +"' clone completed and table enabled!");
154 }
155 metricsSnapshot.addSnapshotClone(status.getCompletionTimestamp() - status.getStartTime());
156 super.completed(exception);
157 }
158
159 @Override
160 public boolean isFinished() {
161 return this.stopped;
162 }
163
164 @Override
165 public long getCompletionTimestamp() {
166 return this.status.getCompletionTimestamp();
167 }
168
169 @Override
170 public SnapshotDescription getSnapshot() {
171 return snapshot;
172 }
173
174 @Override
175 public void cancel(String why) {
176 if (this.stopped) return;
177 this.stopped = true;
178 String msg = "Stopping clone snapshot=" + snapshot + " because: " + why;
179 LOG.info(msg);
180 status.abort(msg);
181 this.monitor.receive(new ForeignException(NAME, new CancellationException(why)));
182 }
183
184 @Override
185 public ForeignException getExceptionIfFailed() {
186 return this.monitor.getException();
187 }
188
189 @Override
190 public void rethrowExceptionIfFailed() throws ForeignException {
191 monitor.rethrowException();
192 }
193 }