org.apache.hadoop.hive.ql.io.orc.SparkOrcNewRecordReader Maven / Gradle / Ivy
/*
* 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.hadoop.hive.ql.io.orc;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import java.io.IOException;
import java.util.List;
/**
* This is based on hive-exec-1.2.1
* {@link org.apache.hadoop.hive.ql.io.orc.OrcNewInputFormat.OrcRecordReader}.
* This class exposes getObjectInspector which can be used for reducing
* NameNode calls in OrcRelation.
*/
public class SparkOrcNewRecordReader extends
org.apache.hadoop.mapreduce.RecordReader {
private final org.apache.hadoop.hive.ql.io.orc.RecordReader reader;
private final int numColumns;
OrcStruct value;
private float progress = 0.0f;
private ObjectInspector objectInspector;
public SparkOrcNewRecordReader(Reader file, Configuration conf,
long offset, long length) throws IOException {
List types = file.getTypes();
numColumns = (types.size() == 0) ? 0 : types.get(0).getSubtypesCount();
value = new OrcStruct(numColumns);
this.reader = OrcInputFormat.createReaderFromFile(file, conf, offset,
length);
this.objectInspector = file.getObjectInspector();
}
@Override
public void close() throws IOException {
reader.close();
}
@Override
public NullWritable getCurrentKey() throws IOException,
InterruptedException {
return NullWritable.get();
}
@Override
public OrcStruct getCurrentValue() throws IOException,
InterruptedException {
return value;
}
@Override
public float getProgress() throws IOException, InterruptedException {
return progress;
}
@Override
public void initialize(InputSplit split, TaskAttemptContext context)
throws IOException, InterruptedException {
}
@Override
public boolean nextKeyValue() throws IOException, InterruptedException {
if (reader.hasNext()) {
reader.next(value);
progress = reader.getProgress();
return true;
} else {
return false;
}
}
public ObjectInspector getObjectInspector() {
return objectInspector;
}
}