| /* |
| * 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 |
| * |
| * https://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 org.apache.trevni.avro.mapreduce; |
| |
| import java.io.IOException; |
| |
| import org.apache.avro.mapred.AvroKey; |
| 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 {@link org.apache.hadoop.mapreduce.OutputFormat} that writes Avro data to |
| * Trevni files. |
| * |
| * This implement was modeled off |
| * {@link org.apache.avro.mapreduce.AvroKeyOutputFormat} to allow for easy |
| * transition |
| * |
| * FileOutputFormat for writing Trevni container files. |
| * |
| * <p> |
| * Since Trevni container files only contain records (not key/value pairs), this |
| * output format ignores the value. |
| * </p> |
| * |
| * @param <T> The (java) type of the Trevni data to write. |
| * |
| * <p> |
| * Writes a directory of files per task, each comprising a single |
| * filesystem block. To reduce the number of files, increase the |
| * default filesystem block size for the job. Each task also requires |
| * enough memory to buffer a filesystem block. |
| */ |
| public class AvroTrevniKeyOutputFormat<T> extends FileOutputFormat<AvroKey<T>, NullWritable> { |
| |
| @Override |
| public RecordWriter<AvroKey<T>, NullWritable> getRecordWriter(TaskAttemptContext context) |
| throws IOException, InterruptedException { |
| |
| return new AvroTrevniKeyRecordWriter<>(context); |
| } |
| } |