com.renren.hadoop.oiv.tools.MoveData.java Source code

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Here is the source code for com.renren.hadoop.oiv.tools.MoveData.java

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/**
 * 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 com.renren.hadoop.oiv.tools;

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.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;

public class MoveData {

    public static final String DATA_TO_DIR = "data.to.dir";
    public static final String DEFAULT_DATA_OUTPUT_DIR = "/cool_data";

    public static class MoveDataMapper extends Mapper<Object, Text, Text, IntWritable> {

        // private final static IntWritable one = new IntWritable(1);
        // private Text word;
        private FileSystem fs;
        private String dataToDir;
        BlackListManager blackListManager;

        protected void setup(Context context) throws IOException, InterruptedException {
            this.fs = FileSystem.get(context.getConfiguration());
            this.dataToDir = context.getConfiguration().get(DATA_TO_DIR, DEFAULT_DATA_OUTPUT_DIR);
            this.blackListManager = new BlackListManager(context.getConfiguration());
            // NOTHING
        }

        public void map(Object key, Text value, Context context) throws IOException, InterruptedException {
            // filter illegal file
            if (value.toString().equals("")) {
                return;
            }
            // filter files that in blackList
            if (this.blackListManager.isInBlackList(value.toString())) {
                return;
            }
            // move it
            try {

                Path fromPath = new Path(value.toString());
                // filter directory
                if (this.fs.isDirectory(fromPath)) {
                    return;
                }
                //
                Path toPath = new Path(this.dataToDir + value.toString());
                // create toPath
                this.fs.mkdirs(toPath.getParent());
                // move fromPath to toPath
                this.fs.rename(fromPath, toPath);
            } catch (Exception e) {
                e.printStackTrace();
                this.fs = FileSystem.get(context.getConfiguration());
            }
        }
    }

    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
        if (otherArgs.length != 3 && otherArgs.length != 4) {
            System.err.println("Usage: MoveData <data_from_dir> <data_to_dir> <job_out_dir> [<black_list_file>]");
            System.exit(2);
        }
        String blackListFile = null;
        if (otherArgs.length == 4) {
            blackListFile = otherArgs[3];
        } else {
            System.err.println("Warn: black_list_file param is not given");
        }

        String dataFromDir = otherArgs[0];
        conf.set(DATA_TO_DIR, otherArgs[1]);
        conf.set(BlackListManager.BLACK_LIST_FILE, blackListFile);
        String jobOutDir = otherArgs[2];

        Job job = new Job(conf, "clearData");
        job.setJarByClass(MoveData.class);
        job.setMapperClass(MoveDataMapper.class);

        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);
        FileInputFormat.addInputPath(job, new Path(dataFromDir));
        FileOutputFormat.setOutputPath(job, new Path(jobOutDir));
        System.exit(job.waitForCompletion(true) ? 0 : 1);
    }
}