@Override
  public OutputCommitter getOutputCommitter(TaskAttemptContext context)
    throws IOException, InterruptedException {
    return new TableOutputCommitter();
  }
Writes an action (Put or Delete) to the specified table. the table being updated. the update,
either a put or a delete. if the action is not a put or a delete.
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/MultiTableOutputFormat.java