com.ibm.spss.hive.serde2.xml.SplittableXmlInputFormat Maven / Gradle / Ivy
/**
* (c) Copyright IBM Corp. 2013. All rights reserved.
*
* Licensed 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 com.ibm.spss.hive.serde2.xml;
import java.io.IOException;
import java.io.InputStream;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.compress.CodecPool;
import org.apache.hadoop.io.compress.CompressionCodec;
import org.apache.hadoop.io.compress.CompressionCodecFactory;
import org.apache.hadoop.io.compress.Decompressor;
import org.apache.hadoop.io.compress.SplittableCompressionCodec;
import org.apache.hadoop.mapred.FileSplit;
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.mapred.TextInputFormat;
/**
* Reads records that are delimited by a specific begin/end tag.
*/
public class SplittableXmlInputFormat extends TextInputFormat {
@Override
public RecordReader getRecordReader(InputSplit inputSplit, JobConf job, Reporter reporter) throws IOException {
InputStream inputStream = null;
try {
inputStream = getInputStream(job, (FileSplit) inputSplit);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
long start = ((FileSplit) inputSplit).getStart();
long end = start + inputSplit.getLength();
return new HiveXmlRecordReader(job, inputStream, start, end);
}
private InputStream getInputStream(JobConf jobConf, FileSplit split) throws IOException, ClassNotFoundException {
FSDataInputStream fsin = null;
// open the file and seek to the start of the split
long splitStart = split.getStart();
long splitEnd = splitStart + split.getLength();
Path file = split.getPath();
FileSystem fs = file.getFileSystem(jobConf);
fsin = fs.open(split.getPath());
fsin.seek(splitStart);
Configuration conf = new Configuration();
CompressionCodecFactory compressionCodecFactory = new CompressionCodecFactory(conf);
CompressionCodec codec = compressionCodecFactory.getCodec(split.getPath());
Decompressor decompressor = CodecPool.getDecompressor(codec);
if (codec instanceof SplittableCompressionCodec) {
return ((SplittableCompressionCodec) codec).createInputStream(fsin,
decompressor,
splitStart,
splitEnd,
SplittableCompressionCodec.READ_MODE.BYBLOCK);
} else {
return codec.createInputStream(fsin, decompressor);
}
}
}