com.blm.orc.OrcNewOutputFormat.java Source code

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Here is the source code for com.blm.orc.OrcNewOutputFormat.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.blm.orc;

import java.io.IOException;
import java.util.ArrayList;

import org.apache.hadoop.fs.Path;
import com.blm.orc.OrcSerde.OrcSerdeRow;
import org.apache.hadoop.hive.ql.io.orc.OrcProto;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorFactory;
import org.apache.hadoop.hive.shims.ShimLoader;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

/** An OutputFormat that writes ORC files. */
public class OrcNewOutputFormat extends FileOutputFormat<NullWritable, OrcSerdeRow> {

    private static class OrcRecordWriter extends RecordWriter<NullWritable, OrcSerdeRow> {
        private Writer writer = null;
        private final Path path;
        private final OrcFile.WriterOptions options;

        OrcRecordWriter(Path path, OrcFile.WriterOptions options) {
            this.path = path;
            this.options = options;
        }

        @Override
        public void write(NullWritable key, OrcSerdeRow row) throws IOException, InterruptedException {
            if (writer == null) {
                options.inspector(row.getInspector());
                writer = OrcFile.createWriter(path, options);
            }
            writer.addRow(row.getRow());
        }

        @Override
        public void close(TaskAttemptContext context) throws IOException, InterruptedException {
            if (writer == null) {
                // a row with no columns
                ObjectInspector inspector = ObjectInspectorFactory.getStandardStructObjectInspector(
                        new ArrayList<String>(), new ArrayList<ObjectInspector>());
                options.inspector(inspector);
                writer = OrcFile.createWriter(path, options);
            }
            writer.close();
        }
    }

    @Override
    public RecordWriter getRecordWriter(TaskAttemptContext context) throws IOException, InterruptedException {
        Path file = getDefaultWorkFile(context, "");
        return new OrcRecordWriter(file,
                OrcFile.writerOptions(ShimLoader.getHadoopShims().getConfiguration(context)));
    }
}