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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.HRegionInfo;
32 import org.apache.hadoop.hbase.HTableDescriptor;
33 import org.apache.hadoop.hbase.NotAllMetaRegionsOnlineException;
34 import org.apache.hadoop.hbase.TableExistsException;
35 import org.apache.hadoop.hbase.catalog.MetaReader;
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.SnapshotSentinel;
41 import org.apache.hadoop.hbase.master.handler.CreateTableHandler;
42 import org.apache.hadoop.hbase.master.metrics.MasterMetrics;
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.RestoreSnapshotException;
47 import org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper;
48 import org.apache.hadoop.hbase.snapshot.SnapshotDescriptionUtils;
49 import org.apache.hadoop.hbase.util.Bytes;
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 MasterMetrics metricsMaster;
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 final MasterMetrics metricsMaster)
78 throws NotAllMetaRegionsOnlineException, TableExistsException, IOException {
79 super(masterServices, masterServices.getMasterFileSystem(),
80 masterServices.getServerManager(), hTableDescriptor,
81 masterServices.getConfiguration(), null, masterServices.getCatalogTracker(),
82 masterServices.getAssignmentManager());
83 this.metricsMaster = metricsMaster;
84
85
86 this.snapshot = snapshot;
87
88
89 this.monitor = new ForeignExceptionDispatcher();
90 this.status = TaskMonitor.get().createStatus("Cloning snapshot '" + snapshot.getName() +
91 "' to table " + hTableDescriptor.getNameAsString());
92 }
93
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97
98
99 @Override
100 protected List<HRegionInfo> handleCreateHdfsRegions(final Path tableRootDir,
101 final String tableName) throws IOException {
102 status.setStatus("Creating regions for table: " + tableName);
103 FileSystem fs = fileSystemManager.getFileSystem();
104 Path rootDir = fileSystemManager.getRootDir();
105 Path tableDir = new Path(tableRootDir, tableName);
106
107 try {
108
109 Path snapshotDir = SnapshotDescriptionUtils.getCompletedSnapshotDir(snapshot, rootDir);
110 RestoreSnapshotHelper restoreHelper = new RestoreSnapshotHelper(conf, fs,
111 snapshot, snapshotDir, hTableDescriptor, tableDir, 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=" + SnapshotDescriptionUtils.toString(snapshot) + " failed";
129 LOG.error(msg, e);
130 IOException rse = new RestoreSnapshotException(msg, e, snapshot);
131
132
133 this.monitor.receive(new ForeignException(NAME, rse));
134 throw rse;
135 }
136 }
137
138 @Override
139 protected void addRegionsToMeta(final CatalogTracker ct, final List<HRegionInfo> regionInfos)
140 throws IOException {
141 super.addRegionsToMeta(ct, regionInfos);
142 metaChanges.updateMetaParentRegions(ct, regionInfos);
143 }
144
145 @Override
146 protected void completed(final Throwable exception) {
147 this.stopped = true;
148 if (exception != null) {
149 status.abort("Snapshot '" + snapshot.getName() + "' clone failed because " +
150 exception.getMessage());
151 } else {
152 status.markComplete("Snapshot '"+ snapshot.getName() +"' clone completed and table enabled!");
153 }
154 metricsMaster.addSnapshotClone(status.getCompletionTimestamp() - status.getStartTime());
155 super.completed(exception);
156 }
157
158 @Override
159 public boolean isFinished() {
160 return this.stopped;
161 }
162
163 @Override
164 public long getCompletionTimestamp() {
165 return this.status.getCompletionTimestamp();
166 }
167
168 @Override
169 public SnapshotDescription getSnapshot() {
170 return snapshot;
171 }
172
173 @Override
174 public void cancel(String why) {
175 if (this.stopped) return;
176 this.stopped = true;
177 String msg = "Stopping clone snapshot=" + snapshot + " because: " + why;
178 LOG.info(msg);
179 status.abort(msg);
180 this.monitor.receive(new ForeignException(NAME, new CancellationException(why)));
181 }
182
183 @Override
184 public ForeignException getExceptionIfFailed() {
185 return this.monitor.getException();
186 }
187
188 @Override
189 public void rethrowExceptionIfFailed() throws ForeignException {
190 monitor.rethrowException();
191 }
192 }