org.apache.accumulo.examples.wikisearch.output.SortingRFileOutputFormat.java Source code

Introduction

Here is the source code for org.apache.accumulo.examples.wikisearch.output.SortingRFileOutputFormat.java

Source

/*
 * 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.accumulo.examples.wikisearch.output;

import java.io.IOException;

import org.apache.accumulo.core.conf.AccumuloConfiguration;
import org.apache.accumulo.core.data.Mutation;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.OutputCommitter;
import org.apache.hadoop.mapreduce.OutputFormat;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;

public class SortingRFileOutputFormat extends OutputFormat<Text, Mutation> {

    // private static final Logger log = Logger.getLogger(SortingRFileOutputFormat.class);

    public static final String PATH_NAME = "sortingrfileoutputformat.path";
    public static final String MAX_BUFFER_SIZE = "sortingrfileoutputformat.max.buffer.size";

    public static void setPathName(Configuration conf, String path) {
        conf.set(PATH_NAME, path);
    }

    public static String getPathName(Configuration conf) {
        return conf.get(PATH_NAME);
    }

    public static void setMaxBufferSize(Configuration conf, long maxBufferSize) {
        conf.setLong(MAX_BUFFER_SIZE, maxBufferSize);
    }

    public static long getMaxBufferSize(Configuration conf) {
        return conf.getLong(MAX_BUFFER_SIZE, -1);
    }

    @Override
    public void checkOutputSpecs(JobContext job) throws IOException, InterruptedException {
        // TODO make sure the path is writable?
        // TODO make sure the max buffer size is set and is reasonable
    }

    @Override
    public OutputCommitter getOutputCommitter(TaskAttemptContext arg0) throws IOException, InterruptedException {
        return new OutputCommitter() {

            @Override
            public void setupTask(TaskAttemptContext arg0) throws IOException {
                // TODO Auto-generated method stub

            }

            @Override
            public void setupJob(JobContext arg0) throws IOException {
                // TODO Auto-generated method stub

            }

            @Override
            public boolean needsTaskCommit(TaskAttemptContext arg0) throws IOException {
                // TODO Auto-generated method stub
                return false;
            }

            @Override
            public void commitTask(TaskAttemptContext arg0) throws IOException {
                // TODO Auto-generated method stub

            }

            @Override
            public void cleanupJob(JobContext arg0) throws IOException {
                // TODO Auto-generated method stub

            }

            @Override
            public void abortTask(TaskAttemptContext arg0) throws IOException {
                // TODO Auto-generated method stub

            }
        };
    }

    @Override
    public RecordWriter<Text, Mutation> getRecordWriter(TaskAttemptContext attempt)
            throws IOException, InterruptedException {

        // grab the configuration
        final Configuration conf = attempt.getConfiguration();
        // grab the max size
        final long maxSize = getMaxBufferSize(conf);

        return new BufferingRFileRecordWriter(maxSize, conf);
    }

}