com.facebook.hiveio.output.RecordWriterImpl.java Source code

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Here is the source code for com.facebook.hiveio.output.RecordWriterImpl.java

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/*
 * 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.hiveio.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.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.facebook.hiveio.common.ProgressReporter;
import com.facebook.hiveio.record.HiveWritableRecord;

import java.io.IOException;
import java.util.List;

/**
 * RecordWriter for Hive
 */
class RecordWriterImpl extends RecordWriter<WritableComparable, HiveWritableRecord> {
    /** Logger */
    private static final Logger LOG = LoggerFactory.getLogger(RecordWriterImpl.class);

    // CHECKSTYLE: stop LineLength
    /** Base Hadoop RecordWriter */
    protected 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 RecordWriterImpl(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 = HiveApiOutputObserver.Empty.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, HiveWritableRecord 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, HiveWritableRecord 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, HiveWritableRecord 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));
    }
}