/*
* 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 com.facebook.giraph.hive.impl.output;
import org.apache.hadoop.hive.serde2.SerDeException;
import org.apache.hadoop.hive.serde2.Serializer;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.log4j.Logger;
import com.facebook.giraph.hive.HiveRecord;
import com.facebook.giraph.hive.impl.common.ProgressReporter;
import com.facebook.giraph.hive.output.HiveApiOutputObserver;
import java.io.IOException;
import java.util.List;
/**
* RecordWriter for Hive
*/
public class HiveApiRecordWriter
extends RecordWriter<WritableComparable, HiveRecord> {
/** Logger */
private static final Logger LOG = Logger.getLogger(HiveApiRecordWriter.class);
// CHECKSTYLE: stop LineLength
/** Base Hadoop RecordWriter */
private final org.apache.hadoop.mapred.RecordWriter<WritableComparable, Writable> baseWriter;
// CHECKSTYLE: resume LineLength
/** Hive record serializer */
private final Serializer serializer;
/** Hive table data inspector */
private final ObjectInspector objectInspector;
/** Observer */
private HiveApiOutputObserver observer;
// CHECKSTYLE: stop LineLength
/**
* Constructor
*
* @param baseWriter Hadoop RecordWriter
* @param serializer Serializer
* @param objectInspector ObjectInspector
*/
public HiveApiRecordWriter(
org.apache.hadoop.mapred.RecordWriter<WritableComparable, Writable> baseWriter,
Serializer serializer, ObjectInspector objectInspector) {
// CHECKSTYLE: resume LineLength
this.baseWriter = baseWriter;
this.serializer = serializer;
this.objectInspector = objectInspector;
this.observer = NoOpOutputObserver.get();
}
public HiveApiOutputObserver getObserver() {
return observer;
}
/**
* Set observer
*
* @param observer Hive observer to set
*/
public void setObserver(HiveApiOutputObserver observer) {
if (observer != null) {
this.observer = observer;
}
}
@Override
public void write(WritableComparable key, HiveRecord value)
throws IOException, InterruptedException {
Writable serializedValue = serialize(key, value);
write(key, value, serializedValue);
}
/**
* Serialize a key/value
*
* @param key Key
* @param value Value
* @return Serialized value. Key is ignored.
* @throws IOException I/O errors
*/
private Writable serialize(WritableComparable key, HiveRecord value)
throws IOException {
List<Object> rowData = value.getAllColumns();
Writable serializedValue;
observer.beginSerialize(key, value);
try {
serializedValue = serializer.serialize(rowData, objectInspector);
} catch (SerDeException e) {
observer.serializeFailed(key, value);
throw new IOException("Serialize failed", e);
}
observer.endSerialize(key, value);
return serializedValue;
}
/**
* Write serialized data to Hive
*
* @param key Key
* @param value Value
* @param serializedValue Serialized value
* @throws IOException I/O errors
*/
private void write(WritableComparable key, HiveRecord value,
Writable serializedValue) throws IOException {
observer.beginWrite(key, value);
baseWriter.write(NullWritable.get(), serializedValue);
observer.endWrite(key, value);
}
@Override
public void close(TaskAttemptContext context)
throws IOException, InterruptedException {
baseWriter.close(new ProgressReporter(context));
}
}