Java JobConf.setStrings方法代码示例

import org.apache.hadoop.mapred.JobConf; //导入方法依赖的package包/类
/**
 * Use this before submitting a TableReduce job. It will
 * appropriately set up the JobConf.
 *
 * @param table  The output table.
 * @param reducer  The reducer class to use.
 * @param job  The current job configuration to adjust.
 * @param partitioner  Partitioner to use. Pass <code>null</code> to use
 * default partitioner.
 * @param addDependencyJars upload HBase jars and jars for any of the configured
 *           job classes via the distributed cache (tmpjars).
 * @throws IOException When determining the region count fails.
 */
public static void initTableReduceJob(String table,
  Class<? extends TableReduce> reducer, JobConf job, Class partitioner,
  boolean addDependencyJars) throws IOException {
  job.setOutputFormat(TableOutputFormat.class);
  job.setReducerClass(reducer);
  job.set(TableOutputFormat.OUTPUT_TABLE, table);
  job.setOutputKeyClass(ImmutableBytesWritable.class);
  job.setOutputValueClass(Put.class);
  job.setStrings("io.serializations", job.get("io.serializations"),
      MutationSerialization.class.getName(), ResultSerialization.class.getName());
  if (partitioner == HRegionPartitioner.class) {
    job.setPartitionerClass(HRegionPartitioner.class);
    int regions =
      MetaTableAccessor.getRegionCount(HBaseConfiguration.create(job), TableName.valueOf(table));
    if (job.getNumReduceTasks() > regions) {
      job.setNumReduceTasks(regions);
    }
  } else if (partitioner != null) {
    job.setPartitionerClass(partitioner);
  }
  if (addDependencyJars) {
    addDependencyJars(job);
  }
  initCredentials(job);
}
 

import org.apache.hadoop.mapred.JobConf; //导入方法依赖的package包/类
/**
 * Use this before submitting a TableMap job. It will
 * appropriately set up the JobConf.
 *
 * @param table  The table name to read from.
 * @param columns  The columns to scan.
 * @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 configuration to adjust.
 * @param addDependencyJars upload HBase jars and jars for any of the configured
 *           job classes via the distributed cache (tmpjars).
 */
public static void initTableMapJob(String table, String columns,
  Class<? extends TableMap> mapper,
  Class<?> outputKeyClass,
  Class<?> outputValueClass, JobConf job, boolean addDependencyJars,
  Class<? extends InputFormat> inputFormat) {

  job.setInputFormat(inputFormat);
  job.setMapOutputValueClass(outputValueClass);
  job.setMapOutputKeyClass(outputKeyClass);
  job.setMapperClass(mapper);
  job.setStrings("io.serializations", job.get("io.serializations"),
      MutationSerialization.class.getName(), ResultSerialization.class.getName());
  FileInputFormat.addInputPaths(job, table);
  job.set(TableInputFormat.COLUMN_LIST, columns);
  if (addDependencyJars) {
    try {
      addDependencyJars(job);
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
  try {
    initCredentials(job);
  } catch (IOException ioe) {
    // just spit out the stack trace?  really?
    ioe.printStackTrace();
  }
}