parquet.hadoop.ParquetMultiOutputCommitter.java Source code

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Here is the source code for parquet.hadoop.ParquetMultiOutputCommitter.java

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

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

/**
 * Commit job and write summary if is enabled
 *
 * @author Nguyen Duc Hoa
 */
public class ParquetMultiOutputCommitter extends FileOutputCommitter {
    private static final Log LOG = Log.getLog(ParquetMultiOutputCommitter.class);

    private final Path outputPath;

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

    public void commitJob(JobContext jobContext) throws IOException {
        super.commitJob(jobContext);
        Configuration configuration = ContextUtil.getConfiguration(jobContext);
        if (configuration.getBoolean(ParquetMultiOutputFormat.ENABLE_JOB_SUMMARY, true)) {
            try {
                final FileSystem fileSystem = outputPath.getFileSystem(configuration);
                FileStatus[] statuses = fileSystem.globStatus(new Path(outputPath, new Path("*\\.parquet")));

                for (FileStatus outputStatus : statuses) {
                    List<Footer> footers = ParquetFileReader.readAllFootersInParallel(configuration, outputStatus);
                    try {
                        ParquetFileWriter.writeMetadataFile(configuration, outputStatus.getPath(), footers);
                    } catch (Exception e) {
                        LOG.warn("could not write summary file for " + outputStatus.getPath(), e);
                        final Path metadataPath = new Path(outputStatus.getPath(),
                                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);
            }
        }
    }
}