GenericMRLoadJobCreator.java
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上传日期:2018-01-08
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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 org.apache.hadoop.mapred;
- import java.util.Random;
- import java.util.Stack;
- import org.apache.hadoop.fs.FileStatus;
- import org.apache.hadoop.fs.FileSystem;
- import org.apache.hadoop.fs.Path;
- import org.apache.hadoop.io.LongWritable;
- import org.apache.hadoop.io.SequenceFile;
- import org.apache.hadoop.io.Text;
- import org.apache.hadoop.mapred.GenericMRLoadGenerator;
- import org.apache.hadoop.mapred.lib.NullOutputFormat;
- import org.apache.hadoop.mapred.JobConf;
- public class GenericMRLoadJobCreator extends GenericMRLoadGenerator {
- public static JobConf createJob(String[] argv, boolean mapoutputCompressed,
- boolean outputCompressed) throws Exception {
- JobConf job = new JobConf();
- job.setJarByClass(GenericMRLoadGenerator.class);
- job.setMapperClass(SampleMapper.class);
- job.setReducerClass(SampleReducer.class);
- if (!parseArgs(argv, job)) {
- return null;
- }
- if (null == FileOutputFormat.getOutputPath(job)) {
- // No output dir? No writes
- job.setOutputFormat(NullOutputFormat.class);
- }
- if (0 == FileInputFormat.getInputPaths(job).length) {
- // No input dir? Generate random data
- System.err.println("No input path; ignoring InputFormat");
- confRandom(job);
- } else if (null != job.getClass("mapred.indirect.input.format", null)) {
- // specified IndirectInputFormat? Build src list
- JobClient jClient = new JobClient(job);
- Path sysdir = jClient.getSystemDir();
- Random r = new Random();
- Path indirInputFile = new Path(sysdir, Integer.toString(r
- .nextInt(Integer.MAX_VALUE), 36)
- + "_files");
- job.set("mapred.indirect.input.file", indirInputFile.toString());
- SequenceFile.Writer writer = SequenceFile.createWriter(sysdir
- .getFileSystem(job), job, indirInputFile, LongWritable.class,
- Text.class, SequenceFile.CompressionType.NONE);
- try {
- for (Path p : FileInputFormat.getInputPaths(job)) {
- FileSystem fs = p.getFileSystem(job);
- Stack<Path> pathstack = new Stack<Path>();
- pathstack.push(p);
- while (!pathstack.empty()) {
- for (FileStatus stat : fs.listStatus(pathstack.pop())) {
- if (stat.isDir()) {
- if (!stat.getPath().getName().startsWith("_")) {
- pathstack.push(stat.getPath());
- }
- } else {
- writer.sync();
- writer.append(new LongWritable(stat.getLen()), new Text(stat
- .getPath().toUri().toString()));
- }
- }
- }
- }
- } finally {
- writer.close();
- }
- }
- job.setCompressMapOutput(mapoutputCompressed);
- job.setBoolean("mapred.output.compress", outputCompressed);
- return job;
- }
- }