Java TableMapReduceUtil.initTableSnapshotMapperJob方法代碼示例

import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil; //導入方法依賴的package包/類
/**
 * Main entry point.
 *
 * @param args  The command line parameters.
 * @throws Exception When running the job fails.
 */
public static void main(String[] args) throws Exception {
  // vv AnalyzeSnapshotData
  Configuration conf = HBaseConfiguration.create();
  String[] otherArgs =
    new GenericOptionsParser(conf, args).getRemainingArgs();
  CommandLine cmd = parseArgs(otherArgs);
  if (cmd.hasOption("d")) conf.set("conf.debug", "true");
  String table = cmd.getOptionValue("t");
  long time = System.currentTimeMillis();
  String tmpName = "snapshot-" + table + "-" + time; // co AnalyzeSnapshotData-1-TmpName Compute a name for the snapshot and restore directory, if not specified otherwise.
  String snapshot = cmd.getOptionValue("s", tmpName);
  Path restoreDir = new Path(cmd.getOptionValue("b", "/tmp/" + tmpName));
  String column = cmd.getOptionValue("c");
  String output = cmd.getOptionValue("o");
  boolean cleanup = Boolean.valueOf(cmd.getOptionValue("x"));

  /*...*/
  // ^^ AnalyzeSnapshotData
  Scan scan = new Scan();
  if (column != null) {
    byte[][] colkey = KeyValue.parseColumn(Bytes.toBytes(column));
    if (colkey.length > 1) {
      scan.addColumn(colkey[0], colkey[1]);
    } else {
      scan.addFamily(colkey[0]);
    }
  }

  // vv AnalyzeSnapshotData
  Connection connection = ConnectionFactory.createConnection(conf);
  Admin admin = connection.getAdmin();
  LOG.info("Performing snapshot of table " + table + " as " + snapshot);
  admin.snapshot(snapshot, TableName.valueOf(table)); // co AnalyzeSnapshotData-2-Snap Create a snapshot of the table.

  LOG.info("Setting up job");
  Job job = Job.getInstance(conf, "Analyze data in snapshot " + table);
  job.setJarByClass(AnalyzeSnapshotData.class);
  TableMapReduceUtil.initTableSnapshotMapperJob(snapshot, scan,
    AnalyzeMapper.class, Text.class, IntWritable.class, job, true,
    restoreDir); // co AnalyzeSnapshotData-2-Util Set up the snapshot mapper phase using the supplied utility.
  TableMapReduceUtil.addDependencyJars(job.getConfiguration(),
    JSONParser.class);
  job.setReducerClass(AnalyzeReducer.class);
  job.setOutputKeyClass(Text.class);
  job.setOutputValueClass(IntWritable.class);
  job.setNumReduceTasks(1);
  FileOutputFormat.setOutputPath(job, new Path(output));

  System.exit(job.waitForCompletion(true) ? 0 : 1);

  if (cleanup) {
    LOG.info("Cleaning up snapshot and restore directory");
    admin.deleteSnapshot(snapshot); // co AnalyzeSnapshotData-3-Cleanup Optionally clean up after the job is complete.
    restoreDir.getFileSystem(conf).delete(restoreDir, true);
  }
  admin.close();
  connection.close();
  // ^^ AnalyzeSnapshotData
}
 

import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil; //導入方法依賴的package包/類
public void testSnapshotScanMapReduce() throws IOException, InterruptedException, ClassNotFoundException {
  Stopwatch scanOpenTimer = new Stopwatch();
  Stopwatch scanTimer = new Stopwatch();

  Scan scan = getScan();

  String jobName = "testSnapshotScanMapReduce";

  Job job = new Job(conf);
  job.setJobName(jobName);

  job.setJarByClass(getClass());

  TableMapReduceUtil.initTableSnapshotMapperJob(
      this.snapshotName,
      scan,
      MyMapper.class,
      NullWritable.class,
      NullWritable.class,
      job,
      true,
      new Path(restoreDir)
  );

  job.setNumReduceTasks(0);
  job.setOutputKeyClass(NullWritable.class);
  job.setOutputValueClass(NullWritable.class);
  job.setOutputFormatClass(NullOutputFormat.class);

  scanTimer.start();
  job.waitForCompletion(true);
  scanTimer.stop();

  Counters counters = job.getCounters();
  long numRows = counters.findCounter(ScanCounter.NUM_ROWS).getValue();
  long numCells = counters.findCounter(ScanCounter.NUM_CELLS).getValue();

  long totalBytes = counters.findCounter(HBASE_COUNTER_GROUP_NAME, "BYTES_IN_RESULTS").getValue();
  double throughput = (double)totalBytes / scanTimer.elapsedTime(TimeUnit.SECONDS);
  double throughputRows = (double)numRows / scanTimer.elapsedTime(TimeUnit.SECONDS);
  double throughputCells = (double)numCells / scanTimer.elapsedTime(TimeUnit.SECONDS);

  System.out.println("HBase scan mapreduce: ");
  System.out.println("total time to open scanner: " + scanOpenTimer.elapsedMillis() + " ms");
  System.out.println("total time to scan: " + scanTimer.elapsedMillis() + " ms");

  System.out.println("total bytes: " + totalBytes + " bytes ("
      + StringUtils.humanReadableInt(totalBytes) + ")");
  System.out.println("throughput  : " + StringUtils.humanReadableInt((long)throughput) + "B/s");
  System.out.println("total rows  : " + numRows);
  System.out.println("throughput  : " + StringUtils.humanReadableInt((long)throughputRows) + " rows/s");
  System.out.println("total cells : " + numCells);
  System.out.println("throughput  : " + StringUtils.humanReadableInt((long)throughputCells) + " cells/s");
}
 

import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil; //導入方法依賴的package包/類
public void testSnapshotScanMapReduce() throws IOException, InterruptedException, ClassNotFoundException {
  Stopwatch scanOpenTimer = Stopwatch.createUnstarted();
  Stopwatch scanTimer = Stopwatch.createUnstarted();

  Scan scan = getScan();

  String jobName = "testSnapshotScanMapReduce";

  Job job = new Job(conf);
  job.setJobName(jobName);

  job.setJarByClass(getClass());

  TableMapReduceUtil.initTableSnapshotMapperJob(
      this.snapshotName,
      scan,
      MyMapper.class,
      NullWritable.class,
      NullWritable.class,
      job,
      true,
      new Path(restoreDir)
  );

  job.setNumReduceTasks(0);
  job.setOutputKeyClass(NullWritable.class);
  job.setOutputValueClass(NullWritable.class);
  job.setOutputFormatClass(NullOutputFormat.class);

  scanTimer.start();
  job.waitForCompletion(true);
  scanTimer.stop();

  Counters counters = job.getCounters();
  long numRows = counters.findCounter(ScanCounter.NUM_ROWS).getValue();
  long numCells = counters.findCounter(ScanCounter.NUM_CELLS).getValue();

  long totalBytes = counters.findCounter(HBASE_COUNTER_GROUP_NAME, "BYTES_IN_RESULTS").getValue();
  double throughput = (double)totalBytes / scanTimer.elapsed(TimeUnit.SECONDS);
  double throughputRows = (double)numRows / scanTimer.elapsed(TimeUnit.SECONDS);
  double throughputCells = (double)numCells / scanTimer.elapsed(TimeUnit.SECONDS);

  System.out.println("HBase scan mapreduce: ");
  System.out.println("total time to open scanner: " +
    scanOpenTimer.elapsed(TimeUnit.MILLISECONDS) + " ms");
  System.out.println("total time to scan: " + scanTimer.elapsed(TimeUnit.MILLISECONDS) + " ms");

  System.out.println("total bytes: " + totalBytes + " bytes ("
      + StringUtils.humanReadableInt(totalBytes) + ")");
  System.out.println("throughput  : " + StringUtils.humanReadableInt((long)throughput) + "B/s");
  System.out.println("total rows  : " + numRows);
  System.out.println("throughput  : " + StringUtils.humanReadableInt((long)throughputRows) + " rows/s");
  System.out.println("total cells : " + numCells);
  System.out.println("throughput  : " + StringUtils.humanReadableInt((long)throughputCells) + " cells/s");
}