package voldemort.store.readonly.mr;
/*
* Copyright 2008-2009 LinkedIn, Inc
*
* 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.
*/
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Iterator;
import org.apache.avro.mapred.AvroKey;
import org.apache.avro.mapred.AvroValue;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Closeable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.JobConfigurable;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.Reporter;
import org.apache.log4j.Logger;
import voldemort.store.readonly.disk.HadoopStoreWriterPerBucket;
import voldemort.store.readonly.disk.KeyValueWriter;
import azkaban.common.utils.Utils;
/**
* Take key md5s and value bytes and build a Avro read-only store from these
* values
*/
public class AvroStoreBuilderReducerPerBucket implements
Reducer<AvroKey<ByteBuffer>, AvroValue<ByteBuffer>, Text, Text>, JobConfigurable, Closeable {
private static final Logger logger = Logger.getLogger(AvroStoreBuilderReducerPerBucket.class);
String keyValueWriterClass;
@SuppressWarnings("rawtypes")
KeyValueWriter writer;
@Override
public void reduce(AvroKey<ByteBuffer> keyAvro,
Iterator<AvroValue<ByteBuffer>> iterator,
OutputCollector<Text, Text> collector,
Reporter reporter) throws IOException {
ByteBuffer keyBuffer = keyAvro.datum();
keyBuffer.rewind();
byte[] keyBytes = null, valueBytes;
keyBytes = new byte[keyBuffer.remaining()];
keyBuffer.get(keyBytes);
BytesWritable key = new BytesWritable(keyBytes);
ArrayList<BytesWritable> valueList = new ArrayList();
while(iterator.hasNext()) {
ByteBuffer writable = iterator.next().datum();
writable.rewind();
// BytesWritable writable = iterator.next();
valueBytes = null;
valueBytes = new byte[writable.remaining()];
writable.get(valueBytes);
BytesWritable value = new BytesWritable(valueBytes);
valueList.add(value);
}
writer.write(key, valueList.iterator(), reporter);
}
@Override
public void configure(JobConf job) {
JobConf conf = job;
try {
keyValueWriterClass = conf.get("writer.class");
if(keyValueWriterClass != null)
writer = (KeyValueWriter) Utils.callConstructor(keyValueWriterClass);
else
writer = new HadoopStoreWriterPerBucket();
writer.conf(job);
} catch(Exception e) {
// throw new RuntimeException("Failed to open Input/OutputStream",
// e);
e.printStackTrace();
}
}
@Override
public void close() throws IOException {
writer.close();
}
}