ParquetThriftStorer.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 parquet.thrift.pig;

import java.io.IOException;
import java.util.Arrays;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.OutputFormat;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.pig.StoreFunc;
import org.apache.pig.data.Tuple;

import parquet.hadoop.ParquetOutputFormat;
import parquet.io.ParquetEncodingException;

/**
 * To store in Pig using a thrift class
 * usage:
 * STORE 'foo' USING parquet.thrift.pig.ParquetThriftStorer('my.thrift.Class');
 *
 * @author Julien Le Dem
 *
 */
public class ParquetThriftStorer extends StoreFunc {

  private RecordWriter<Void, Tuple> recordWriter;

  private String className;

  public ParquetThriftStorer(String[] params) {
    if (params == null || params.length != 1) {
      throw new IllegalArgumentException("required the thrift class name in parameter. Got " + Arrays.toString(params) + " instead");
    }
    className = params[0];
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public OutputFormat<Void, Tuple> getOutputFormat() throws IOException {
    return new ParquetOutputFormat<Tuple>(new TupleToThriftWriteSupport(className));
  }

  /**
   * {@inheritDoc}
   */
  @SuppressWarnings({ "rawtypes", "unchecked" }) // that's how the base class is defined
  @Override
  public void prepareToWrite(RecordWriter recordWriter) throws IOException {
    this.recordWriter = recordWriter;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void putNext(Tuple tuple) throws IOException {
    try {
      this.recordWriter.write(null, tuple);
    } catch (InterruptedException e) {
      throw new ParquetEncodingException("Interrupted while writing", e);
    }
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void setStoreLocation(String location, Job job) throws IOException {
    FileOutputFormat.setOutputPath(job, new Path(location));
  }

}