Java HBaseConfiguration.merge方法代码示例

import org.apache.hadoop.hbase.HBaseConfiguration; //导入方法依赖的package包/类
/**
 * Sets up the job for reading from one or more table snapshots, with one or more scans
 * per snapshot.
 * It bypasses hbase servers and read directly from snapshot files.
 *
 * @param snapshotScans     map of snapshot name to scans on that snapshot.
 * @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).
 */
public static void initMultiTableSnapshotMapperJob(Map<String, Collection<Scan>> snapshotScans,
    Class<? extends TableMapper> mapper, Class<?> outputKeyClass, Class<?> outputValueClass,
    Job job, boolean addDependencyJars, Path tmpRestoreDir) throws IOException {
  MultiTableSnapshotInputFormat.setInput(job.getConfiguration(), snapshotScans, tmpRestoreDir);

  job.setInputFormatClass(MultiTableSnapshotInputFormat.class);
  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));

  if (addDependencyJars) {
    addDependencyJars(job);
  }

  resetCacheConfig(job.getConfiguration());
}
 

import org.apache.hadoop.hbase.HBaseConfiguration; //导入方法依赖的package包/类
/**
 * 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).
 * @param initCredentials whether to initialize hbase auth credentials for the job
 * @param inputFormatClass the input format
 * @throws IOException When setting up the details fails.
 */
public static void initTableMapperJob(String table, Scan scan,
    Class<? extends TableMapper> mapper,
    Class<?> outputKeyClass,
    Class<?> outputValueClass, Job job,
    boolean addDependencyJars, boolean initCredentials,
    Class<? extends InputFormat> inputFormatClass)
throws IOException {
  job.setInputFormatClass(inputFormatClass);
  if (outputValueClass != null) job.setMapOutputValueClass(outputValueClass);
  if (outputKeyClass != null) job.setMapOutputKeyClass(outputKeyClass);
  job.setMapperClass(mapper);
  if (Put.class.equals(outputValueClass)) {
    job.setCombinerClass(PutCombiner.class);
  }
  Configuration conf = job.getConfiguration();
  HBaseConfiguration.merge(conf, HBaseConfiguration.create(conf));
  conf.set(TableInputFormat.INPUT_TABLE, table);
  conf.set(TableInputFormat.SCAN, convertScanToString(scan));
  conf.setStrings("io.serializations", conf.get("io.serializations"),
      MutationSerialization.class.getName(), ResultSerialization.class.getName(),
      KeyValueSerialization.class.getName());
  if (addDependencyJars) {
    addDependencyJars(job);
  }
  if (initCredentials) {
    initCredentials(job);
  }
}
 

import org.apache.hadoop.hbase.HBaseConfiguration; //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 to adjust.  Make sure the passed job is
 * carrying all necessary HBase configuration.
 * @param partitioner  Partitioner to use. Pass <code>null</code> to use
 * default partitioner.
 * @param quorumAddress Distant cluster to write to; default is null for
 * output to the cluster that is designated in <code>hbase-site.xml</code>.
 * Set this String to the zookeeper ensemble of an alternate remote cluster
 * when you would have the reduce write a cluster that is other than the
 * default; e.g. copying tables between clusters, the source would be
 * designated by <code>hbase-site.xml</code> and this param would have the
 * ensemble address of the remote cluster.  The format to pass is particular.
 * Pass <code> &lt;hbase.zookeeper.quorum&gt;:&lt;
 *             hbase.zookeeper.client.port&gt;:&lt;zookeeper.znode.parent&gt;
 * </code> such as <code>server,server2,server3:2181:/hbase</code>.
 * @param serverClass redefined hbase.regionserver.class
 * @param serverImpl redefined hbase.regionserver.impl
 * @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 initTableReducerJob(String table,
  Class<? extends TableReducer> reducer, Job job,
  Class partitioner, String quorumAddress, String serverClass,
  String serverImpl, boolean addDependencyJars) throws IOException {

  Configuration conf = job.getConfiguration();
  HBaseConfiguration.merge(conf, HBaseConfiguration.create(conf));
  job.setOutputFormatClass(TableOutputFormat.class);
  if (reducer != null) job.setReducerClass(reducer);
  conf.set(TableOutputFormat.OUTPUT_TABLE, table);
  conf.setStrings("io.serializations", conf.get("io.serializations"),
      MutationSerialization.class.getName(), ResultSerialization.class.getName());
  // If passed a quorum/ensemble address, pass it on to TableOutputFormat.
  if (quorumAddress != null) {
    // Calling this will validate the format
    ZKConfig.validateClusterKey(quorumAddress);
    conf.set(TableOutputFormat.QUORUM_ADDRESS,quorumAddress);
  }
  if (serverClass != null && serverImpl != null) {
    conf.set(TableOutputFormat.REGION_SERVER_CLASS, serverClass);
    conf.set(TableOutputFormat.REGION_SERVER_IMPL, serverImpl);
  }
  job.setOutputKeyClass(ImmutableBytesWritable.class);
  job.setOutputValueClass(Writable.class);
  if (partitioner == HRegionPartitioner.class) {
    job.setPartitionerClass(HRegionPartitioner.class);
    int regions = MetaTableAccessor.getRegionCount(conf, TableName.valueOf(table));
    if (job.getNumReduceTasks() > regions) {
      job.setNumReduceTasks(regions);
    }
  } else if (partitioner != null) {
    job.setPartitionerClass(partitioner);
  }

  if (addDependencyJars) {
    addDependencyJars(job);
  }

  initCredentials(job);
}