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19 package org.apache.hadoop.hbase.snapshot;
20
21 import java.io.FileNotFoundException;
22 import java.io.IOException;
23 import java.util.ArrayList;
24 import java.util.Collections;
25 import java.util.Comparator;
26 import java.util.LinkedList;
27 import java.util.List;
28
29 import org.apache.commons.logging.Log;
30 import org.apache.commons.logging.LogFactory;
31
32 import org.apache.hadoop.classification.InterfaceAudience;
33 import org.apache.hadoop.classification.InterfaceStability;
34 import org.apache.hadoop.conf.Configuration;
35 import org.apache.hadoop.conf.Configured;
36 import org.apache.hadoop.fs.FSDataInputStream;
37 import org.apache.hadoop.fs.FSDataOutputStream;
38 import org.apache.hadoop.fs.FileChecksum;
39 import org.apache.hadoop.fs.FileStatus;
40 import org.apache.hadoop.fs.FileSystem;
41 import org.apache.hadoop.fs.FileUtil;
42 import org.apache.hadoop.fs.Path;
43 import org.apache.hadoop.fs.permission.FsPermission;
44 import org.apache.hadoop.hbase.HBaseConfiguration;
45 import org.apache.hadoop.hbase.HConstants;
46 import org.apache.hadoop.hbase.io.HFileLink;
47 import org.apache.hadoop.hbase.io.HLogLink;
48 import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription;
49 import org.apache.hadoop.hbase.regionserver.StoreFile;
50 import org.apache.hadoop.hbase.snapshot.ExportSnapshotException;
51 import org.apache.hadoop.hbase.snapshot.SnapshotDescriptionUtils;
52 import org.apache.hadoop.hbase.snapshot.SnapshotReferenceUtil;
53 import org.apache.hadoop.hbase.util.Bytes;
54 import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
55 import org.apache.hadoop.hbase.util.FSUtils;
56 import org.apache.hadoop.hbase.util.Pair;
57 import org.apache.hadoop.io.NullWritable;
58 import org.apache.hadoop.io.SequenceFile;
59 import org.apache.hadoop.io.Text;
60 import org.apache.hadoop.mapreduce.Job;
61 import org.apache.hadoop.mapreduce.Mapper;
62 import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
63 import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
64 import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
65 import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat;
66 import org.apache.hadoop.util.StringUtils;
67 import org.apache.hadoop.util.Tool;
68 import org.apache.hadoop.util.ToolRunner;
69
70
71
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74
75
76
77 @InterfaceAudience.Public
78 @InterfaceStability.Evolving
79 public final class ExportSnapshot extends Configured implements Tool {
80 private static final Log LOG = LogFactory.getLog(ExportSnapshot.class);
81
82 private static final String CONF_FILES_USER = "snapshot.export.files.attributes.user";
83 private static final String CONF_FILES_GROUP = "snapshot.export.files.attributes.group";
84 private static final String CONF_FILES_MODE = "snapshot.export.files.attributes.mode";
85 private static final String CONF_CHECKSUM_VERIFY = "snapshot.export.checksum.verify";
86 private static final String CONF_OUTPUT_ROOT = "snapshot.export.output.root";
87 private static final String CONF_INPUT_ROOT = "snapshot.export.input.root";
88 private static final String CONF_STAGING_ROOT = "snapshot.export.staging.root";
89
90 private static final String INPUT_FOLDER_PREFIX = "export-files.";
91
92
93 public enum Counter { MISSING_FILES, COPY_FAILED, BYTES_EXPECTED, BYTES_COPIED };
94
95 private static class ExportMapper extends Mapper<Text, NullWritable, NullWritable, NullWritable> {
96 final static int REPORT_SIZE = 1 * 1024 * 1024;
97 final static int BUFFER_SIZE = 64 * 1024;
98
99 private boolean verifyChecksum;
100 private String filesGroup;
101 private String filesUser;
102 private short filesMode;
103
104 private FileSystem outputFs;
105 private Path outputArchive;
106 private Path outputRoot;
107
108 private FileSystem inputFs;
109 private Path inputArchive;
110 private Path inputRoot;
111
112 @Override
113 public void setup(Context context) {
114 Configuration conf = context.getConfiguration();
115 verifyChecksum = conf.getBoolean(CONF_CHECKSUM_VERIFY, true);
116
117 filesGroup = conf.get(CONF_FILES_GROUP);
118 filesUser = conf.get(CONF_FILES_USER);
119 filesMode = (short)conf.getInt(CONF_FILES_MODE, 0);
120 outputRoot = new Path(conf.get(CONF_OUTPUT_ROOT));
121 inputRoot = new Path(conf.get(CONF_INPUT_ROOT));
122
123 inputArchive = new Path(inputRoot, HConstants.HFILE_ARCHIVE_DIRECTORY);
124 outputArchive = new Path(outputRoot, HConstants.HFILE_ARCHIVE_DIRECTORY);
125
126 try {
127 inputFs = FileSystem.get(inputRoot.toUri(), conf);
128 } catch (IOException e) {
129 throw new RuntimeException("Could not get the input FileSystem with root=" + inputRoot, e);
130 }
131
132 try {
133 outputFs = FileSystem.get(outputRoot.toUri(), conf);
134 } catch (IOException e) {
135 throw new RuntimeException("Could not get the output FileSystem with root="+ outputRoot, e);
136 }
137 }
138
139 @Override
140 public void map(Text key, NullWritable value, Context context)
141 throws InterruptedException, IOException {
142 Path inputPath = new Path(key.toString());
143 Path outputPath = getOutputPath(inputPath);
144
145 LOG.info("copy file input=" + inputPath + " output=" + outputPath);
146 if (copyFile(context, inputPath, outputPath)) {
147 LOG.info("copy completed for input=" + inputPath + " output=" + outputPath);
148 }
149 }
150
151
152
153
154
155
156 private Path getOutputPath(final Path inputPath) throws IOException {
157 Path path;
158 if (HFileLink.isHFileLink(inputPath) || StoreFile.isReference(inputPath)) {
159 String family = inputPath.getParent().getName();
160 String table = HFileLink.getReferencedTableName(inputPath.getName());
161 String region = HFileLink.getReferencedRegionName(inputPath.getName());
162 String hfile = HFileLink.getReferencedHFileName(inputPath.getName());
163 path = new Path(table, new Path(region, new Path(family, hfile)));
164 } else if (isHLogLinkPath(inputPath)) {
165 String logName = inputPath.getName();
166 path = new Path(new Path(outputRoot, HConstants.HREGION_OLDLOGDIR_NAME), logName);
167 } else {
168 path = inputPath;
169 }
170 return new Path(outputArchive, path);
171 }
172
173 private boolean copyFile(final Context context, final Path inputPath, final Path outputPath)
174 throws IOException {
175 FSDataInputStream in = openSourceFile(inputPath);
176 if (in == null) {
177 context.getCounter(Counter.MISSING_FILES).increment(1);
178 return false;
179 }
180
181 try {
182
183 FileStatus inputStat = getFileStatus(inputFs, inputPath);
184 if (inputStat == null) return false;
185
186
187 if (outputFs.exists(outputPath)) {
188 FileStatus outputStat = outputFs.getFileStatus(outputPath);
189 if (sameFile(inputStat, outputStat)) {
190 LOG.info("Skip copy " + inputPath + " to " + outputPath + ", same file.");
191 return true;
192 }
193 }
194
195 context.getCounter(Counter.BYTES_EXPECTED).increment(inputStat.getLen());
196
197
198 outputFs.mkdirs(outputPath.getParent());
199 FSDataOutputStream out = outputFs.create(outputPath, true);
200 try {
201 if (!copyData(context, inputPath, in, outputPath, out, inputStat.getLen()))
202 return false;
203 } finally {
204 out.close();
205 }
206
207
208 return preserveAttributes(outputPath, inputStat);
209 } finally {
210 in.close();
211 }
212 }
213
214
215
216
217 private boolean preserveAttributes(final Path path, final FileStatus refStat) {
218 FileStatus stat;
219 try {
220 stat = outputFs.getFileStatus(path);
221 } catch (IOException e) {
222 LOG.warn("Unable to get the status for file=" + path);
223 return false;
224 }
225
226 try {
227 if (filesMode > 0 && stat.getPermission().toShort() != filesMode) {
228 outputFs.setPermission(path, new FsPermission(filesMode));
229 } else if (!stat.getPermission().equals(refStat.getPermission())) {
230 outputFs.setPermission(path, refStat.getPermission());
231 }
232 } catch (IOException e) {
233 LOG.error("Unable to set the permission for file=" + path, e);
234 return false;
235 }
236
237 try {
238 String user = (filesUser != null) ? filesUser : refStat.getOwner();
239 String group = (filesGroup != null) ? filesGroup : refStat.getGroup();
240 if (!(user.equals(stat.getOwner()) && group.equals(stat.getGroup()))) {
241 outputFs.setOwner(path, user, group);
242 }
243 } catch (IOException e) {
244 LOG.error("Unable to set the owner/group for file=" + path, e);
245 return false;
246 }
247
248 return true;
249 }
250
251 private boolean copyData(final Context context,
252 final Path inputPath, final FSDataInputStream in,
253 final Path outputPath, final FSDataOutputStream out,
254 final long inputFileSize) {
255 final String statusMessage = "copied %s/" + StringUtils.humanReadableInt(inputFileSize) +
256 " (%.3f%%) from " + inputPath + " to " + outputPath;
257
258 try {
259 byte[] buffer = new byte[BUFFER_SIZE];
260 long totalBytesWritten = 0;
261 int reportBytes = 0;
262 int bytesRead;
263
264 while ((bytesRead = in.read(buffer)) > 0) {
265 out.write(buffer, 0, bytesRead);
266 totalBytesWritten += bytesRead;
267 reportBytes += bytesRead;
268
269 if (reportBytes >= REPORT_SIZE) {
270 context.getCounter(Counter.BYTES_COPIED).increment(reportBytes);
271 context.setStatus(String.format(statusMessage,
272 StringUtils.humanReadableInt(totalBytesWritten),
273 reportBytes/(float)inputFileSize));
274 reportBytes = 0;
275 }
276 }
277
278 context.getCounter(Counter.BYTES_COPIED).increment(reportBytes);
279 context.setStatus(String.format(statusMessage,
280 StringUtils.humanReadableInt(totalBytesWritten),
281 reportBytes/(float)inputFileSize));
282
283
284 if (totalBytesWritten != inputFileSize) {
285 LOG.error("number of bytes copied not matching copied=" + totalBytesWritten +
286 " expected=" + inputFileSize + " for file=" + inputPath);
287 context.getCounter(Counter.COPY_FAILED).increment(1);
288 return false;
289 }
290
291 return true;
292 } catch (IOException e) {
293 LOG.error("Error copying " + inputPath + " to " + outputPath, e);
294 context.getCounter(Counter.COPY_FAILED).increment(1);
295 return false;
296 }
297 }
298
299 private FSDataInputStream openSourceFile(final Path path) {
300 try {
301 if (HFileLink.isHFileLink(path) || StoreFile.isReference(path)) {
302 return new HFileLink(inputRoot, inputArchive, path).open(inputFs);
303 } else if (isHLogLinkPath(path)) {
304 String serverName = path.getParent().getName();
305 String logName = path.getName();
306 return new HLogLink(inputRoot, serverName, logName).open(inputFs);
307 }
308 return inputFs.open(path);
309 } catch (IOException e) {
310 LOG.error("Unable to open source file=" + path, e);
311 return null;
312 }
313 }
314
315 private FileStatus getFileStatus(final FileSystem fs, final Path path) {
316 try {
317 if (HFileLink.isHFileLink(path) || StoreFile.isReference(path)) {
318 HFileLink link = new HFileLink(inputRoot, inputArchive, path);
319 return link.getFileStatus(fs);
320 } else if (isHLogLinkPath(path)) {
321 String serverName = path.getParent().getName();
322 String logName = path.getName();
323 return new HLogLink(inputRoot, serverName, logName).getFileStatus(fs);
324 }
325 return fs.getFileStatus(path);
326 } catch (IOException e) {
327 LOG.warn("Unable to get the status for file=" + path);
328 return null;
329 }
330 }
331
332 private FileChecksum getFileChecksum(final FileSystem fs, final Path path) {
333 try {
334 return fs.getFileChecksum(path);
335 } catch (IOException e) {
336 LOG.warn("Unable to get checksum for file=" + path, e);
337 return null;
338 }
339 }
340
341
342
343
344
345 private boolean sameFile(final FileStatus inputStat, final FileStatus outputStat) {
346
347 if (inputStat.getLen() != outputStat.getLen()) return false;
348
349
350 if (!verifyChecksum) return true;
351
352
353 FileChecksum inChecksum = getFileChecksum(inputFs, inputStat.getPath());
354 if (inChecksum == null) return false;
355
356 FileChecksum outChecksum = getFileChecksum(outputFs, outputStat.getPath());
357 if (outChecksum == null) return false;
358
359 return inChecksum.equals(outChecksum);
360 }
361
362
363
364
365
366
367 private static boolean isHLogLinkPath(final Path path) {
368 return path.depth() == 2;
369 }
370 }
371
372
373
374
375
376 private List<Pair<Path, Long>> getSnapshotFiles(final FileSystem fs, final Path snapshotDir)
377 throws IOException {
378 SnapshotDescription snapshotDesc = SnapshotDescriptionUtils.readSnapshotInfo(fs, snapshotDir);
379
380 final List<Pair<Path, Long>> files = new ArrayList<Pair<Path, Long>>();
381 final String table = snapshotDesc.getTable();
382 final Configuration conf = getConf();
383
384
385 SnapshotReferenceUtil.visitReferencedFiles(fs, snapshotDir,
386 new SnapshotReferenceUtil.FileVisitor() {
387 public void storeFile (final String region, final String family, final String hfile)
388 throws IOException {
389 Path path = new Path(family, HFileLink.createHFileLinkName(table, region, hfile));
390 long size = new HFileLink(conf, path).getFileStatus(fs).getLen();
391 files.add(new Pair<Path, Long>(path, size));
392 }
393
394 public void recoveredEdits (final String region, final String logfile)
395 throws IOException {
396
397 }
398
399 public void logFile (final String server, final String logfile)
400 throws IOException {
401 long size = new HLogLink(conf, server, logfile).getFileStatus(fs).getLen();
402 files.add(new Pair<Path, Long>(new Path(server, logfile), size));
403 }
404 });
405
406 return files;
407 }
408
409
410
411
412
413
414
415
416
417 static List<List<Path>> getBalancedSplits(final List<Pair<Path, Long>> files, int ngroups) {
418
419 Collections.sort(files, new Comparator<Pair<Path, Long>>() {
420 public int compare(Pair<Path, Long> a, Pair<Path, Long> b) {
421 long r = a.getSecond() - b.getSecond();
422 return (r < 0) ? -1 : ((r > 0) ? 1 : 0);
423 }
424 });
425
426
427 List<List<Path>> fileGroups = new LinkedList<List<Path>>();
428 long[] sizeGroups = new long[ngroups];
429 int hi = files.size() - 1;
430 int lo = 0;
431
432 List<Path> group;
433 int dir = 1;
434 int g = 0;
435
436 while (hi >= lo) {
437 if (g == fileGroups.size()) {
438 group = new LinkedList<Path>();
439 fileGroups.add(group);
440 } else {
441 group = fileGroups.get(g);
442 }
443
444 Pair<Path, Long> fileInfo = files.get(hi--);
445
446
447 sizeGroups[g] += fileInfo.getSecond();
448 group.add(fileInfo.getFirst());
449
450
451 g += dir;
452 if (g == ngroups) {
453 dir = -1;
454 g = ngroups - 1;
455 } else if (g < 0) {
456 dir = 1;
457 g = 0;
458 }
459 }
460
461 if (LOG.isDebugEnabled()) {
462 for (int i = 0; i < sizeGroups.length; ++i) {
463 LOG.debug("export split=" + i + " size=" + StringUtils.humanReadableInt(sizeGroups[i]));
464 }
465 }
466
467 return fileGroups;
468 }
469
470 private static Path getInputFolderPath(final FileSystem fs, final Configuration conf)
471 throws IOException, InterruptedException {
472 String stagingName = "exportSnapshot-" + EnvironmentEdgeManager.currentTimeMillis();
473 Path stagingDir = new Path(conf.get(CONF_STAGING_ROOT, fs.getWorkingDirectory().toString())
474 , stagingName);
475 fs.mkdirs(stagingDir);
476 return new Path(stagingDir, INPUT_FOLDER_PREFIX +
477 String.valueOf(EnvironmentEdgeManager.currentTimeMillis()));
478 }
479
480
481
482
483
484
485
486 private static Path[] createInputFiles(final Configuration conf,
487 final List<Pair<Path, Long>> snapshotFiles, int mappers)
488 throws IOException, InterruptedException {
489 FileSystem fs = FileSystem.get(conf);
490 Path inputFolderPath = getInputFolderPath(fs, conf);
491 LOG.debug("Input folder location: " + inputFolderPath);
492
493 List<List<Path>> splits = getBalancedSplits(snapshotFiles, mappers);
494 Path[] inputFiles = new Path[splits.size()];
495
496 Text key = new Text();
497 for (int i = 0; i < inputFiles.length; i++) {
498 List<Path> files = splits.get(i);
499 inputFiles[i] = new Path(inputFolderPath, String.format("export-%d.seq", i));
500 SequenceFile.Writer writer = SequenceFile.createWriter(fs, conf, inputFiles[i],
501 Text.class, NullWritable.class);
502 LOG.debug("Input split: " + i);
503 try {
504 for (Path file: files) {
505 LOG.debug(file.toString());
506 key.set(file.toString());
507 writer.append(key, NullWritable.get());
508 }
509 } finally {
510 writer.close();
511 }
512 }
513
514 return inputFiles;
515 }
516
517
518
519
520 private boolean runCopyJob(final Path inputRoot, final Path outputRoot,
521 final List<Pair<Path, Long>> snapshotFiles, final boolean verifyChecksum,
522 final String filesUser, final String filesGroup, final int filesMode,
523 final int mappers) throws IOException, InterruptedException, ClassNotFoundException {
524 Configuration conf = getConf();
525 if (filesGroup != null) conf.set(CONF_FILES_GROUP, filesGroup);
526 if (filesUser != null) conf.set(CONF_FILES_USER, filesUser);
527 conf.setInt(CONF_FILES_MODE, filesMode);
528 conf.setBoolean(CONF_CHECKSUM_VERIFY, verifyChecksum);
529 conf.set(CONF_OUTPUT_ROOT, outputRoot.toString());
530 conf.set(CONF_INPUT_ROOT, inputRoot.toString());
531 conf.setInt("mapreduce.job.maps", mappers);
532
533
534 conf.setBoolean("mapreduce.map.speculative", false);
535 conf.setBoolean("mapreduce.reduce.speculative", false);
536 conf.setBoolean("mapred.map.tasks.speculative.execution", false);
537 conf.setBoolean("mapred.reduce.tasks.speculative.execution", false);
538
539 Job job = new Job(conf);
540 job.setJobName("ExportSnapshot");
541 job.setJarByClass(ExportSnapshot.class);
542 job.setMapperClass(ExportMapper.class);
543 job.setInputFormatClass(SequenceFileInputFormat.class);
544 job.setOutputFormatClass(NullOutputFormat.class);
545 job.setNumReduceTasks(0);
546 for (Path path: createInputFiles(conf, snapshotFiles, mappers)) {
547 LOG.debug("Add Input Path=" + path);
548 SequenceFileInputFormat.addInputPath(job, path);
549 }
550
551 return job.waitForCompletion(true);
552 }
553
554
555
556
557
558 @Override
559 public int run(String[] args) throws Exception {
560 boolean verifyChecksum = true;
561 String snapshotName = null;
562 String filesGroup = null;
563 String filesUser = null;
564 Path outputRoot = null;
565 int filesMode = 0;
566 int mappers = getConf().getInt("mapreduce.job.maps", 1);
567
568
569 for (int i = 0; i < args.length; i++) {
570 String cmd = args[i];
571 try {
572 if (cmd.equals("-snapshot")) {
573 snapshotName = args[++i];
574 } else if (cmd.equals("-copy-to")) {
575 outputRoot = new Path(args[++i]);
576 } else if (cmd.equals("-no-checksum-verify")) {
577 verifyChecksum = false;
578 } else if (cmd.equals("-mappers")) {
579 mappers = Integer.parseInt(args[++i]);
580 } else if (cmd.equals("-chuser")) {
581 filesUser = args[++i];
582 } else if (cmd.equals("-chgroup")) {
583 filesGroup = args[++i];
584 } else if (cmd.equals("-chmod")) {
585 filesMode = Integer.parseInt(args[++i], 8);
586 } else if (cmd.equals("-h") || cmd.equals("--help")) {
587 printUsageAndExit();
588 } else {
589 System.err.println("UNEXPECTED: " + cmd);
590 printUsageAndExit();
591 }
592 } catch (Exception e) {
593 printUsageAndExit();
594 }
595 }
596
597
598 if (snapshotName == null) {
599 System.err.println("Snapshot name not provided.");
600 printUsageAndExit();
601 }
602
603 if (outputRoot == null) {
604 System.err.println("Destination file-system not provided.");
605 printUsageAndExit();
606 }
607
608 Configuration conf = getConf();
609 Path inputRoot = FSUtils.getRootDir(conf);
610 FileSystem inputFs = FileSystem.get(conf);
611 FileSystem outputFs = FileSystem.get(outputRoot.toUri(), conf);
612
613 Path snapshotDir = SnapshotDescriptionUtils.getCompletedSnapshotDir(snapshotName, inputRoot);
614 Path snapshotTmpDir = SnapshotDescriptionUtils.getWorkingSnapshotDir(snapshotName, outputRoot);
615 Path outputSnapshotDir = SnapshotDescriptionUtils.getCompletedSnapshotDir(snapshotName, outputRoot);
616
617
618 if (outputFs.exists(outputSnapshotDir)) {
619 System.err.println("The snapshot '" + snapshotName +
620 "' already exists in the destination: " + outputSnapshotDir);
621 return 1;
622 }
623
624
625 if (outputFs.exists(snapshotTmpDir)) {
626 System.err.println("A snapshot with the same name '" + snapshotName + "' may be in-progress");
627 System.err.println("Please check " + snapshotTmpDir + ". If the snapshot has completed, ");
628 System.err.println("consider removing " + snapshotTmpDir + " before retrying export");
629 return 1;
630 }
631
632
633 final List<Pair<Path, Long>> files = getSnapshotFiles(inputFs, snapshotDir);
634
635
636
637
638 try {
639 FileUtil.copy(inputFs, snapshotDir, outputFs, snapshotTmpDir, false, false, conf);
640 } catch (IOException e) {
641 System.err.println("Failed to copy the snapshot directory: from=" + snapshotDir +
642 " to=" + snapshotTmpDir);
643 e.printStackTrace(System.err);
644 return 1;
645 }
646
647
648
649
650 try {
651 if (files.size() == 0) {
652 LOG.warn("There are 0 store file to be copied. There may be no data in the table.");
653 } else {
654 if (!runCopyJob(inputRoot, outputRoot, files, verifyChecksum,
655 filesUser, filesGroup, filesMode, mappers)) {
656 throw new ExportSnapshotException("Snapshot export failed!");
657 }
658 }
659
660
661 if (!outputFs.rename(snapshotTmpDir, outputSnapshotDir)) {
662 System.err.println("Snapshot export failed!");
663 System.err.println("Unable to rename snapshot directory from=" +
664 snapshotTmpDir + " to=" + outputSnapshotDir);
665 return 1;
666 }
667
668 return 0;
669 } catch (Exception e) {
670 System.err.println("Snapshot export failed!");
671 e.printStackTrace(System.err);
672 outputFs.delete(outputSnapshotDir, true);
673 return 1;
674 }
675 }
676
677
678 private void printUsageAndExit() {
679 System.err.printf("Usage: bin/hbase %s [options]%n", getClass().getName());
680 System.err.println(" where [options] are:");
681 System.err.println(" -h|-help Show this help and exit.");
682 System.err.println(" -snapshot NAME Snapshot to restore.");
683 System.err.println(" -copy-to NAME Remote destination hdfs://");
684 System.err.println(" -no-checksum-verify Do not verify checksum.");
685 System.err.println(" -chuser USERNAME Change the owner of the files to the specified one.");
686 System.err.println(" -chgroup GROUP Change the group of the files to the specified one.");
687 System.err.println(" -chmod MODE Change the permission of the files to the specified one.");
688 System.err.println(" -mappers Number of mappers to use during the copy (mapreduce.job.maps).");
689 System.err.println();
690 System.err.println("Examples:");
691 System.err.println(" hbase " + getClass() + " \\");
692 System.err.println(" -snapshot MySnapshot -copy-to hdfs:///srv2:8082/hbase \\");
693 System.err.println(" -chuser MyUser -chgroup MyGroup -chmod 700 -mappers 16");
694 System.exit(1);
695 }
696
697
698
699
700
701
702
703
704 static int innerMain(final Configuration conf, final String [] args) throws Exception {
705 return ToolRunner.run(conf, new ExportSnapshot(), args);
706 }
707
708 public static void main(String[] args) throws Exception {
709 System.exit(innerMain(HBaseConfiguration.create(), args));
710 }
711 }