content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.asterix.external.input.record.reader.hdfs;
  
  import java.io.IOException;
  import java.security.PrivilegedExceptionAction;
  
  import org.apache.hadoop.io.Writable;
  import org.apache.hadoop.mapred.InputSplit;
  import org.apache.hadoop.mapred.JobConf;
  import org.apache.hadoop.mapred.RecordReader;
  import org.apache.hadoop.mapred.Reporter;
  import org.apache.hadoop.security.UserGroupInformation;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  
  public class HDFSRecordReader<K, V extends Writable> extends AbstractHDFSRecordReader<K, V> {
  
      public HDFSRecordReader(boolean[] read, InputSplit[] inputSplits, String[] readSchedule, String nodeName,
              JobConf conf, UserGroupInformation ugi) {
          super(read, inputSplits, readSchedule, nodeName, conf, ugi);
      }
  
      @Override
      protected void setRecordReader(int splitIndex) throws IOException {
          try {
              reader = ugi == null ? getReader(splitIndex)
                      : ugi.doAs((PrivilegedExceptionAction<RecordReader<K, V>>) () -> getReader(splitIndex));
          } catch (InterruptedException ex) {
              throw HyracksDataException.create(ex);
          }
          if (key == null) {
              key = reader.createKey();
              value = reader.createValue();
          }
      }
  
      @SuppressWarnings("unchecked")
      private RecordReader<K, V> getReader(int splitIndex) throws IOException {
          return (RecordReader<K, V>) inputFormat.getRecordReader(inputSplits[splitIndex], conf, Reporter.NULL);
      }
  
      @Override
      protected boolean onNextInputSplit() {
          return false;
      }
  
      @Override
      public boolean stop() {
          return false;
      }
  
      @Override
      public RecordReader<K, V> getReader() {
          return reader;
      }
  }
  