Java TableMapper類代碼示例

import org.apache.hadoop.hbase.mapreduce.TableMapper; //導入依賴的package包/類
public static void initTableMapperJob(String table, Scan scan,
    Class<? extends TableMapper> mapper,
    Class<? extends WritableComparable> outputKeyClass,
    Class<? extends Writable> outputValueClass, Job job,
    boolean addDependencyJars, Class<? extends InputFormat> inputFormatClass)
throws IOException {
  job.setInputFormatClass(inputFormatClass);
  if (outputValueClass != null) job.setMapOutputValueClass(outputValueClass);
  if (outputKeyClass != null) job.setMapOutputKeyClass(outputKeyClass);
  job.setMapperClass(mapper);
  Configuration conf = job.getConfiguration();
  HBaseConfiguration.merge(conf, HBaseConfiguration.create(conf));
  conf.set(TableInputFormat.INPUT_TABLE, table);
  conf.set(TableInputFormat.SCAN, convertScanToString(scan));
  if (addDependencyJars) {
    addDependencyJars(job);
  }
  TableMapReduceUtil.initCredentials(job);
}
 

import org.apache.hadoop.hbase.mapreduce.TableMapper; //導入依賴的package包/類
/**
 * Use this before submitting a TableMap job. It will appropriately set up
 * the job.
 *
 * @param table  The table name to read from.
 * @param scan  The scan instance with the columns, time range etc.
 * @param mapper  The mapper class to use.
 * @param outputKeyClass  The class of the output key.
 * @param outputValueClass  The class of the output value.
 * @param job  The current job to adjust.  Make sure the passed job is
 * carrying all necessary HBase configuration.
 * @param addDependencyJars upload HBase jars and jars for any of the configured
 *           job classes via the distributed cache (tmpjars).
 * @throws IOException When setting up the details fails.
 */
public static void initTableMapperJob(String table1, String table2, Scan scan1, Scan scan2,
    Class<? extends TableMapper> mapper,
    Class<? extends WritableComparable> outputKeyClass,
    Class<? extends Writable> outputValueClass, Job job,
    boolean addDependencyJars, Class<? extends InputFormat> inputFormatClass)
throws IOException {
  job.setInputFormatClass(inputFormatClass);
  if (outputValueClass != null) job.setMapOutputValueClass(outputValueClass);
  if (outputKeyClass != null) job.setMapOutputKeyClass(outputKeyClass);
  job.setMapperClass(mapper);
  Configuration conf = job.getConfiguration();
  HBaseConfiguration.merge(conf, HBaseConfiguration.create(conf));
  conf.set(TableInputFormat.INPUT_TABLE1, table1);
  conf.set(TableInputFormat.INPUT_TABLE2, table2);
  conf.set(TableInputFormat.SCAN1, convertScanToString(scan1));
  conf.set(TableInputFormat.SCAN2, convertScanToString(scan2));
  if (addDependencyJars) {
    addDependencyJars(job);
  }
  initCredentials(job);
}
 

import org.apache.hadoop.hbase.mapreduce.TableMapper; //導入依賴的package包/類
@SuppressWarnings("rawtypes")
private Job startBulkLoad(Configuration conf, String inputTable,
		String tableName, Class<? extends TableMapper> clazz, Path outputDir)
		throws Exception {

	// Create our job to bulk load into HBase
	Job job = Job.getInstance(conf, "HBase Bulk Loader");
	job.setJarByClass(getClass());

	// Initialize our mapper by specifying the input table
	TableMapReduceUtil.initTableMapperJob(inputTable, new Scan(), clazz,
			ImmutableBytesWritable.class, KeyValue.class, job);

	HFileOutputFormat.configureIncrementalLoad(job, new HTable(conf,
			tableName));
	HFileOutputFormat.setOutputPath(job, outputDir);

	// launch the job
	job.waitForCompletion(true);
	return job;
}
 

import org.apache.hadoop.hbase.mapreduce.TableMapper; //導入依賴的package包/類
/**
 * @param inputTable input table
 * @param outputPath output path
 * @param scanner table row scanner object
 * @param mapper mapper class
 * @param mapperKey table mapper key
 * @param mapperValue table mapper value
 * @param reducer reducer class
 * @param reducerKey reducer key
 * @param reducerValue reducer value
 * @param outputFormat output (file) format
 * @return a ready to run job - unless you need to assign more job specific settings
 * @throws IOException
 */
@SuppressWarnings("rawtypes")
public Job prepareTableMapper(String inputTable, Path outputPath, Scan scanner, Class<? extends TableMapper> mapper,
		Class<? extends WritableComparable> mapperKey, Class<? extends WritableComparable> mapperValue,
		Class<? extends Reducer> reducer, Class<? extends Writable> reducerKey,
		Class<? extends Writable> reducerValue, Class<? extends OutputFormat> outputFormat) throws IOException
{
	setInputTable(inputTable);

	// Configures the Job & starts it:

	Configuration conf = getConf();

	Job job = new Job(conf);
	job.setJobName(getCustomJobName(job, mapper, reducer));

	// mapper:
	TableMapReduceUtil.initTableMapperJob(getInputTable(), scanner, mapper, mapperKey, mapperValue, job);

	job.setReducerClass(reducer);
	job.setOutputKeyClass(reducerKey);
	job.setOutputValueClass(reducerValue);

	job.setOutputFormatClass(outputFormat);

	FileOutputFormat.setOutputPath(job, outputPath);

	return job;
}
 

import org.apache.hadoop.hbase.mapreduce.TableMapper; //導入依賴的package包/類
@SuppressWarnings("rawtypes")
public static Class<? extends TableMapper> wrap(String type) {
	Class<? extends TableMapper> c = IndexMapper.class;
	if (null != type && type.length() > 0) {
		if (type.equals(Const.MAPPER_TYPE_JSON))
			c = IndexJsonMapper.class;
		else if (type.equals(Const.MAPPER_TYPE_ROWKEY))
			c = IndexRowkeyMapper.class;
	}
	return c;
}
 

import org.apache.hadoop.hbase.mapreduce.TableMapper; //導入依賴的package包/類
public TableMapDriver<ImmutableBytesWritable, IntWritable> createMapDriver(TableMapper<ImmutableBytesWritable, IntWritable> tableMapper) {
    TableMapDriver<ImmutableBytesWritable, IntWritable> mapDriver = TableMapDriver.newTableMapDriver(tableMapper);
    configure(mapDriver.getConfiguration());
    return mapDriver;
}