src/java/org/apache/hcatalog/mapreduce/DefaultRecordWriterContainer.java

/**
 * 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.hcatalog.mapreduce;

import java.io.IOException;

import org.apache.hadoop.hive.serde2.SerDe;
import org.apache.hadoop.hive.serde2.SerDeException;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.hcatalog.common.HCatUtil;
import org.apache.hcatalog.data.HCatRecord;

/**
 * Part of the DefaultOutput*Container classes
 * See {@link DefaultOutputFormatContainer} for more information
 */
class DefaultRecordWriterContainer extends RecordWriterContainer {

    private final HCatStorageHandler storageHandler;
    private final SerDe serDe;
    private final OutputJobInfo jobInfo;
    private final ObjectInspector hcatRecordOI;

    /**
     * @param context current JobContext
     * @param baseRecordWriter RecordWriter to contain
     * @throws IOException
     * @throws InterruptedException
     */
    public DefaultRecordWriterContainer(TaskAttemptContext context,
                                        org.apache.hadoop.mapred.RecordWriter<? super WritableComparable<?>, ? super Writable> baseRecordWriter) throws IOException, InterruptedException {
        super(context, baseRecordWriter);
        jobInfo = HCatOutputFormat.getJobInfo(context);
        storageHandler = HCatUtil.getStorageHandler(context.getConfiguration(), jobInfo.getTableInfo().getStorerInfo());
        HCatOutputFormat.configureOutputStorageHandler(context);
        serDe = ReflectionUtils.newInstance(storageHandler.getSerDeClass(), context.getConfiguration());
        hcatRecordOI = InternalUtil.createStructObjectInspector(jobInfo.getOutputSchema());
        try {
            InternalUtil.initializeOutputSerDe(serDe, context.getConfiguration(), jobInfo);
        } catch (SerDeException e) {
            throw new IOException("Failed to initialize SerDe", e);
        }
    }

    @Override
    public void close(TaskAttemptContext context) throws IOException,
        InterruptedException {
        getBaseRecordWriter().close(InternalUtil.createReporter(context));
    }

    @Override
    public void write(WritableComparable<?> key, HCatRecord value) throws IOException,
        InterruptedException {
        try {
            getBaseRecordWriter().write(null, serDe.serialize(value.getAll(), hcatRecordOI));
        } catch (SerDeException e) {
            throw new IOException("Failed to serialize object", e);
        }
    }

}