| /** |
| * 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 org.apache.hcatalog.rcfile; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hive.ql.io.RCFile; |
| import org.apache.hadoop.hive.serde2.columnar.BytesRefArrayWritable; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.io.compress.CompressionCodec; |
| import org.apache.hadoop.io.compress.DefaultCodec; |
| import org.apache.hadoop.mapreduce.RecordWriter; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter; |
| import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| /** |
| * The RC file input format using new Hadoop mapreduce APIs. |
| */ |
| public class RCFileMapReduceOutputFormat extends |
| FileOutputFormat<WritableComparable<?>, BytesRefArrayWritable> { |
| |
| /** |
| * Set number of columns into the given configuration. |
| * @param conf |
| * configuration instance which need to set the column number |
| * @param columnNum |
| * column number for RCFile's Writer |
| * |
| */ |
| public static void setColumnNumber(Configuration conf, int columnNum) { |
| assert columnNum > 0; |
| conf.setInt(RCFile.COLUMN_NUMBER_CONF_STR, columnNum); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.hadoop.mapreduce.lib.output.FileOutputFormat#getRecordWriter(org.apache.hadoop.mapreduce.TaskAttemptContext) |
| */ |
| @Override |
| public org.apache.hadoop.mapreduce.RecordWriter<WritableComparable<?>, BytesRefArrayWritable> getRecordWriter( |
| TaskAttemptContext task) throws IOException, InterruptedException { |
| |
| //FileOutputFormat.getWorkOutputPath takes TaskInputOutputContext instead of |
| //TaskAttemptContext, so can't use that here |
| FileOutputCommitter committer = (FileOutputCommitter) getOutputCommitter(task); |
| Path outputPath = committer.getWorkPath(); |
| |
| FileSystem fs = outputPath.getFileSystem(task.getConfiguration()); |
| |
| if (!fs.exists(outputPath)) { |
| fs.mkdirs(outputPath); |
| } |
| |
| Path file = getDefaultWorkFile(task, ""); |
| |
| CompressionCodec codec = null; |
| if (getCompressOutput(task)) { |
| Class<?> codecClass = getOutputCompressorClass(task, DefaultCodec.class); |
| codec = (CompressionCodec) ReflectionUtils.newInstance(codecClass, task.getConfiguration()); |
| } |
| |
| final RCFile.Writer out = new RCFile.Writer(fs, task.getConfiguration(), file, task, codec); |
| |
| return new RecordWriter<WritableComparable<?>, BytesRefArrayWritable>() { |
| |
| /* (non-Javadoc) |
| * @see org.apache.hadoop.mapreduce.RecordWriter#write(java.lang.Object, java.lang.Object) |
| */ |
| @Override |
| public void write(WritableComparable<?> key, BytesRefArrayWritable value) |
| throws IOException { |
| out.append(value); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.hadoop.mapreduce.RecordWriter#close(org.apache.hadoop.mapreduce.TaskAttemptContext) |
| */ |
| @Override |
| public void close(TaskAttemptContext task) throws IOException, InterruptedException { |
| out.close(); |
| } |
| }; |
| } |
| |
| } |