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/**
 * Copyright 2012 Twitter, Inc.
 *
 * Licensed 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.hadoop;

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


import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter;

import parquet.Log;
import parquet.hadoop.util.ContextUtil;

public class ParquetOutputCommitter extends FileOutputCommitter {
  private static final Log LOG = Log.getLog(ParquetOutputCommitter.class);

  private final Path outputPath;

  public ParquetOutputCommitter(Path outputPath, TaskAttemptContext context) throws IOException {
    super(outputPath, context);
    this.outputPath = outputPath;
  }

  public void commitJob(JobContext jobContext) throws IOException {
    super.commitJob(jobContext);
    try {
      Configuration configuration = ContextUtil.getConfiguration(jobContext);
      final FileSystem fileSystem = outputPath.getFileSystem(configuration);
      FileStatus outputStatus = fileSystem.getFileStatus(outputPath);
      List footers = ParquetFileReader.readAllFootersInParallel(configuration, outputStatus);
      try {
        ParquetFileWriter.writeMetadataFile(configuration, outputPath, footers);
      } catch (Exception e) {
        LOG.warn("could not write summary file for " + outputPath, e);
        final Path metadataPath = new Path(outputPath, ParquetFileWriter.PARQUET_METADATA_FILE);
        if (fileSystem.exists(metadataPath)) {
          fileSystem.delete(metadataPath, true);
        }
      }
    } catch (Exception e) {
      LOG.warn("could not write summary file for " + outputPath, e);
    }
  }

}