Java WordCount类代码示例

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本文整理汇总了Java中org.apache.hadoop.examples.WordCount类的典型用法代码示例。如果您正苦于以下问题：Java WordCount类的具体用法？Java WordCount怎么用？Java WordCount使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。

WordCount类属于org.apache.hadoop.examples包，在下文中一共展示了WordCount类的8个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的Java代码示例。

示例1: runWordCount

import org.apache.hadoop.examples.WordCount; //导入依赖的package包/类
private void runWordCount(Configuration conf
                          ) throws IOException,
                                   InterruptedException,
                                   ClassNotFoundException {
  final String COUNTER_GROUP = "org.apache.hadoop.mapred.Task$Counter";
  localFs.delete(new Path(TEST_ROOT_DIR + "/in"), true);
  localFs.delete(new Path(TEST_ROOT_DIR + "/out"), true);    
  writeFile("in/part1", "this is a test\nof word count test\ntest\n");
  writeFile("in/part2", "more test");
  Job job = new Job(conf, "word count");     
  job.setJarByClass(WordCount.class);
  job.setMapperClass(TokenizerMapper.class);
  job.setCombinerClass(IntSumReducer.class);
  job.setReducerClass(IntSumReducer.class);
  job.setOutputKeyClass(Text.class);
  job.setOutputValueClass(IntWritable.class);
  job.setInputFormatClass(TrackingTextInputFormat.class);
  FileInputFormat.addInputPath(job, new Path(TEST_ROOT_DIR + "/in"));
  FileOutputFormat.setOutputPath(job, new Path(TEST_ROOT_DIR + "/out"));
  assertNull(job.getJobID());
  assertTrue(job.waitForCompletion(false));
  assertNotNull(job.getJobID());
  String out = readFile("out/part-r-00000");
  System.out.println(out);
  assertEquals("a\t1\ncount\t1\nis\t1\nmore\t1\nof\t1\ntest\t4\nthis\t1\nword\t1\n",
               out);
  Counters ctrs = job.getCounters();
  System.out.println("Counters: " + ctrs);
  long combineIn = ctrs.findCounter(COUNTER_GROUP,
                                    "COMBINE_INPUT_RECORDS").getValue();
  long combineOut = ctrs.findCounter(COUNTER_GROUP, 
                                     "COMBINE_OUTPUT_RECORDS").getValue();
  long reduceIn = ctrs.findCounter(COUNTER_GROUP,
                                   "REDUCE_INPUT_RECORDS").getValue();
  long mapOut = ctrs.findCounter(COUNTER_GROUP, 
                                 "MAP_OUTPUT_RECORDS").getValue();
  long reduceOut = ctrs.findCounter(COUNTER_GROUP,
                                    "REDUCE_OUTPUT_RECORDS").getValue();
  long reduceGrps = ctrs.findCounter(COUNTER_GROUP,
                                     "REDUCE_INPUT_GROUPS").getValue();
  assertEquals("map out = combine in", mapOut, combineIn);
  assertEquals("combine out = reduce in", combineOut, reduceIn);
  assertTrue("combine in > combine out", combineIn > combineOut);
  assertEquals("reduce groups = reduce out", reduceGrps, reduceOut);
  String group = "Random Group";
  CounterGroup ctrGrp = ctrs.getGroup(group);
  assertEquals(0, ctrGrp.size());
}

开发者ID:Nextzero，项目名称:hadoop-2.6.0-cdh5.4.3，代码行数:49，代码来源:TestMapReduceLocal.java

示例2: getExamplesJarPath

import org.apache.hadoop.examples.WordCount; //导入依赖的package包/类
private String getExamplesJarPath() {
  Class clazz = WordCount.class;
  return clazz.getProtectionDomain().getCodeSource().getLocation().getPath();
}

开发者ID:spotify，项目名称:spydra，代码行数:5，代码来源:LifecycleIT.java

示例3: runSecondarySort

import org.apache.hadoop.examples.WordCount; //导入依赖的package包/类
private void runSecondarySort(Configuration conf) throws IOException,
                                                      InterruptedException,
                                                      ClassNotFoundException {
  FileSystem localFs = FileSystem.getLocal(conf);
  localFs.delete(new Path(TEST_ROOT_DIR + "/in"), true);
  localFs.delete(new Path(TEST_ROOT_DIR + "/out"), true);
  TestMapReduceLocal.writeFile
           ("in/part1", "-1 -4\n-3 23\n5 10\n-1 -2\n-1 300\n-1 10\n4 1\n" +
            "4 2\n4 10\n4 -1\n4 -10\n10 20\n10 30\n10 25\n");
  Job job = new Job(conf, "word count");
  job.setJarByClass(WordCount.class);
  job.setNumReduceTasks(2);
  job.setMapperClass(SecondarySort.MapClass.class);
  job.setReducerClass(SecondarySort.Reduce.class);
  // group and partition by the first int in the pair
  job.setPartitionerClass(FirstPartitioner.class);
  job.setGroupingComparatorClass(FirstGroupingComparator.class);

  // the map output is IntPair, IntWritable
  job.setMapOutputKeyClass(IntPair.class);
  job.setMapOutputValueClass(IntWritable.class);

  // the reduce output is Text, IntWritable
  job.setOutputKeyClass(Text.class);
  job.setOutputValueClass(IntWritable.class);

  FileInputFormat.addInputPath(job, new Path(TEST_ROOT_DIR + "/in"));
  FileOutputFormat.setOutputPath(job, new Path(TEST_ROOT_DIR + "/out"));
  assertTrue(job.waitForCompletion(true));
  String out = TestMapReduceLocal.readFile("out/part-r-00000");
  assertEquals("------------------------------------------------\n" +
               "4\t-10\n4\t-1\n4\t1\n4\t2\n4\t10\n" +
               "------------------------------------------------\n" +
               "10\t20\n10\t25\n10\t30\n", out);
  out = TestMapReduceLocal.readFile("out/part-r-00001");
  assertEquals("------------------------------------------------\n" +
               "-3\t23\n" +
               "------------------------------------------------\n" +
               "-1\t-4\n-1\t-2\n-1\t10\n-1\t300\n" +
               "------------------------------------------------\n" +
               "5\t10\n", out);
}

开发者ID:Nextzero，项目名称:hadoop-2.6.0-cdh5.4.3，代码行数:43，代码来源:TestMiniMRLocalFS.java

示例4: runWordCount

import org.apache.hadoop.examples.WordCount; //导入依赖的package包/类
private void runWordCount(Configuration conf
                          ) throws IOException,
                                   InterruptedException,
                                   ClassNotFoundException {
  final String COUNTER_GROUP = "org.apache.hadoop.mapred.Task$Counter";
  localFs.delete(new Path(TEST_ROOT_DIR + "/in"), true);
  localFs.delete(new Path(TEST_ROOT_DIR + "/out"), true);    
  writeFile("in/part1", "this is a test\nof word count test\ntest\n");
  writeFile("in/part2", "more test");
  Job job = new Job(conf, "word count");     
  job.setJarByClass(WordCount.class);
  job.setMapperClass(TokenizerMapper.class);
  job.setCombinerClass(IntSumReducer.class);
  job.setReducerClass(IntSumReducer.class);
  job.setOutputKeyClass(Text.class);
  job.setOutputValueClass(IntWritable.class);
  job.setInputFormatClass(TrackingTextInputFormat.class);
  FileInputFormat.addInputPath(job, new Path(TEST_ROOT_DIR + "/in"));
  FileOutputFormat.setOutputPath(job, new Path(TEST_ROOT_DIR + "/out"));
  assertTrue(job.waitForCompletion(false));
  String out = readFile("out/part-r-00000");
  System.out.println(out);
  assertEquals("a\t1\ncount\t1\nis\t1\nmore\t1\nof\t1\ntest\t4\nthis\t1\nword\t1\n",
               out);
  Counters ctrs = job.getCounters();
  System.out.println("Counters: " + ctrs);
  long combineIn = ctrs.findCounter(COUNTER_GROUP,
                                    "COMBINE_INPUT_RECORDS").getValue();
  long combineOut = ctrs.findCounter(COUNTER_GROUP, 
                                     "COMBINE_OUTPUT_RECORDS").getValue();
  long reduceIn = ctrs.findCounter(COUNTER_GROUP,
                                   "REDUCE_INPUT_RECORDS").getValue();
  long mapOut = ctrs.findCounter(COUNTER_GROUP, 
                                 "MAP_OUTPUT_RECORDS").getValue();
  long reduceOut = ctrs.findCounter(COUNTER_GROUP,
                                    "REDUCE_OUTPUT_RECORDS").getValue();
  long reduceGrps = ctrs.findCounter(COUNTER_GROUP,
                                     "REDUCE_INPUT_GROUPS").getValue();
  assertEquals("map out = combine in", mapOut, combineIn);
  assertEquals("combine out = reduce in", combineOut, reduceIn);
  assertTrue("combine in > combine out", combineIn > combineOut);
  assertEquals("reduce groups = reduce out", reduceGrps, reduceOut);
  String group = "Random Group";
  CounterGroup ctrGrp = ctrs.getGroup(group);
  assertEquals(0, ctrGrp.size());
}

开发者ID:rhli，项目名称:hadoop-EAR，代码行数:47，代码来源:TestMapReduceLocal.java

示例5: runWordCount

import org.apache.hadoop.examples.WordCount; //导入依赖的package包/类
private void runWordCount(Configuration conf
                          ) throws IOException,
                                   InterruptedException,
                                   ClassNotFoundException {
  final String COUNTER_GROUP = "org.apache.hadoop.mapred.Task$Counter";
  localFs.delete(new Path(TEST_ROOT_DIR + "/in"), true);
  localFs.delete(new Path(TEST_ROOT_DIR + "/out"), true);    
  writeFile("in/part1", "this is a test\nof word count test\ntest\n");
  writeFile("in/part2", "more test");
  Job job = new Job(conf, "word count");     
  job.setJarByClass(WordCount.class);
  job.setMapperClass(TokenizerMapper.class);
  job.setCombinerClass(IntSumReducer.class);
  job.setReducerClass(IntSumReducer.class);
  job.setOutputKeyClass(Text.class);
  job.setOutputValueClass(IntWritable.class);
  job.setInputFormatClass(TrackingTextInputFormat.class);
  FileInputFormat.addInputPath(job, new Path(TEST_ROOT_DIR + "/in"));
  FileOutputFormat.setOutputPath(job, new Path(TEST_ROOT_DIR + "/out"));
  assertNull("job.getJobID() must be null before the job is submitted",
      job.getJobID());
  job.submit();
  assertNotNull("job.getJobID() can't be null after the job is submitted",
  job.getJobID());
  assertTrue(job.waitForCompletion(false));
  assertNotNull("job.getJobID() can't be null again after the job is finished",
  job.getJobID());
  String out = readFile("out/part-r-00000");
  System.out.println(out);
  assertEquals("a\t1\ncount\t1\nis\t1\nmore\t1\nof\t1\ntest\t4\nthis\t1\nword\t1\n",
               out);
  Counters ctrs = job.getCounters();
  System.out.println("Counters: " + ctrs);
  long combineIn = ctrs.findCounter(COUNTER_GROUP,
                                    "COMBINE_INPUT_RECORDS").getValue();
  long combineOut = ctrs.findCounter(COUNTER_GROUP, 
                                     "COMBINE_OUTPUT_RECORDS").getValue();
  long reduceIn = ctrs.findCounter(COUNTER_GROUP,
                                   "REDUCE_INPUT_RECORDS").getValue();
  long mapOut = ctrs.findCounter(COUNTER_GROUP, 
                                 "MAP_OUTPUT_RECORDS").getValue();
  long reduceOut = ctrs.findCounter(COUNTER_GROUP,
                                    "REDUCE_OUTPUT_RECORDS").getValue();
  long reduceGrps = ctrs.findCounter(COUNTER_GROUP,
                                     "REDUCE_INPUT_GROUPS").getValue();
  assertEquals("map out = combine in", mapOut, combineIn);
  assertEquals("combine out = reduce in", combineOut, reduceIn);
  assertTrue("combine in > combine out", combineIn > combineOut);
  assertEquals("reduce groups = reduce out", reduceGrps, reduceOut);
  String group = "Random Group";
  CounterGroup ctrGrp = ctrs.getGroup(group);
  assertEquals(0, ctrGrp.size());
}

开发者ID:Seagate，项目名称:hadoop-on-lustre，代码行数:54，代码来源:TestMapReduceLocal.java

示例6: runSecondarySort

import org.apache.hadoop.examples.WordCount; //导入依赖的package包/类
private void runSecondarySort(Configuration conf) throws IOException,
                                                      InterruptedException,
                                                      ClassNotFoundException {
  FileSystem localFs = FileSystem.getLocal(conf);
  localFs.delete(new Path(TEST_ROOT_DIR + "/in"), true);
  localFs.delete(new Path(TEST_ROOT_DIR + "/out"), true);
  TestMapReduceLocal.writeFile
           ("in/part1", "-1 -4\n-3 23\n5 10\n-1 -2\n-1 300\n-1 10\n4 1\n" +
            "4 2\n4 10\n4 -1\n4 -10\n10 20\n10 30\n10 25\n");
  Job job = Job.getInstance(conf, "word count");
  job.setJarByClass(WordCount.class);
  job.setNumReduceTasks(2);
  job.setMapperClass(SecondarySort.MapClass.class);
  job.setReducerClass(SecondarySort.Reduce.class);
  // group and partition by the first int in the pair
  job.setPartitionerClass(FirstPartitioner.class);
  job.setGroupingComparatorClass(FirstGroupingComparator.class);

  // the map output is IntPair, IntWritable
  job.setMapOutputKeyClass(IntPair.class);
  job.setMapOutputValueClass(IntWritable.class);

  // the reduce output is Text, IntWritable
  job.setOutputKeyClass(Text.class);
  job.setOutputValueClass(IntWritable.class);

  FileInputFormat.addInputPath(job, new Path(TEST_ROOT_DIR + "/in"));
  FileOutputFormat.setOutputPath(job, new Path(TEST_ROOT_DIR + "/out"));
  assertTrue(job.waitForCompletion(true));
  String out = TestMapReduceLocal.readFile("out/part-r-00000");
  assertEquals("------------------------------------------------\n" +
               "4\t-10\n4\t-1\n4\t1\n4\t2\n4\t10\n" +
               "------------------------------------------------\n" +
               "10\t20\n10\t25\n10\t30\n", out);
  out = TestMapReduceLocal.readFile("out/part-r-00001");
  assertEquals("------------------------------------------------\n" +
               "-3\t23\n" +
               "------------------------------------------------\n" +
               "-1\t-4\n-1\t-2\n-1\t10\n-1\t300\n" +
               "------------------------------------------------\n" +
               "5\t10\n", out);
}

开发者ID:rekhajoshm，项目名称:mapreduce-fork，代码行数:43，代码来源:TestMiniMRLocalFS.java

示例7: runWordCount

import org.apache.hadoop.examples.WordCount; //导入依赖的package包/类
private void runWordCount(Configuration conf
                          ) throws IOException,
                                   InterruptedException,
                                   ClassNotFoundException {
  final String COUNTER_GROUP = "org.apache.hadoop.mapreduce.TaskCounter";
  localFs.delete(new Path(TEST_ROOT_DIR + "/in"), true);
  localFs.delete(new Path(TEST_ROOT_DIR + "/out"), true);    
  writeFile("in/part1", "this is a test\nof word count test\ntest\n");
  writeFile("in/part2", "more test");
  Job job = Job.getInstance(conf, "word count");     
  job.setJarByClass(WordCount.class);
  job.setMapperClass(TokenizerMapper.class);
  job.setCombinerClass(IntSumReducer.class);
  job.setReducerClass(IntSumReducer.class);
  job.setOutputKeyClass(Text.class);
  job.setOutputValueClass(IntWritable.class);
  job.setInputFormatClass(TrackingTextInputFormat.class);
  FileInputFormat.addInputPath(job, new Path(TEST_ROOT_DIR + "/in"));
  FileOutputFormat.setOutputPath(job, new Path(TEST_ROOT_DIR + "/out"));
  assertTrue(job.waitForCompletion(false));
  String out = readFile("out/part-r-00000");
  System.out.println(out);
  assertEquals("a\t1\ncount\t1\nis\t1\nmore\t1\nof\t1\ntest\t4\nthis\t1\nword\t1\n",
               out);
  Counters ctrs = job.getCounters();
  System.out.println("Counters: " + ctrs);
  long mapIn = ctrs.findCounter(FileInputFormat.COUNTER_GROUP, 
                                FileInputFormat.BYTES_READ).getValue();
  assertTrue(mapIn != 0);    
  long combineIn = ctrs.findCounter(COUNTER_GROUP,
                                    "COMBINE_INPUT_RECORDS").getValue();
  long combineOut = ctrs.findCounter(COUNTER_GROUP, 
                                     "COMBINE_OUTPUT_RECORDS").getValue();
  long reduceIn = ctrs.findCounter(COUNTER_GROUP,
                                   "REDUCE_INPUT_RECORDS").getValue();
  long mapOut = ctrs.findCounter(COUNTER_GROUP, 
                                 "MAP_OUTPUT_RECORDS").getValue();
  long reduceOut = ctrs.findCounter(COUNTER_GROUP,
                                    "REDUCE_OUTPUT_RECORDS").getValue();
  long reduceGrps = ctrs.findCounter(COUNTER_GROUP,
                                     "REDUCE_INPUT_GROUPS").getValue();
  long mergedMapOutputs = ctrs.findCounter(COUNTER_GROUP,
                                          "MERGED_MAP_OUTPUTS").getValue();
  long shuffledMaps = ctrs.findCounter(COUNTER_GROUP,
                                       "SHUFFLED_MAPS").getValue();
  assertEquals("map out = combine in", mapOut, combineIn);
  assertEquals("combine out = reduce in", combineOut, reduceIn);
  assertTrue("combine in > combine out", combineIn > combineOut);
  assertEquals("reduce groups = reduce out", reduceGrps, reduceOut);
  assertEquals("Mismatch in mergedMapOutputs", mergedMapOutputs, 2);
  assertEquals("Mismatch in shuffledMaps", shuffledMaps, 2);
  String group = "Random Group";
  CounterGroup ctrGrp = ctrs.getGroup(group);
  assertEquals(0, ctrGrp.size());
}

开发者ID:rekhajoshm，项目名称:mapreduce-fork，代码行数:56，代码来源:TestMapReduceLocal.java

示例8: runWordCount

import org.apache.hadoop.examples.WordCount; //导入依赖的package包/类
private void runWordCount(Configuration conf
                          ) throws IOException,
                                   InterruptedException,
                                   ClassNotFoundException {
  final String COUNTER_GROUP = "org.apache.hadoop.mapred.Task$Counter";
  localFs.delete(new Path(TEST_ROOT_DIR + "/in"), true);
  localFs.delete(new Path(TEST_ROOT_DIR + "/out"), true);    
  writeFile("in/part1", "this is a test\nof word count test\ntest\n");
  writeFile("in/part2", "more test");
  Job job = new Job(conf, "word count");     
  job.setJarByClass(WordCount.class);
  job.setMapperClass(TokenizerMapper.class);
  job.setCombinerClass(IntSumReducer.class);
  job.setReducerClass(IntSumReducer.class);
  job.setOutputKeyClass(Text.class);
  job.setOutputValueClass(IntWritable.class);
  job.setInputFormatClass(TrackingTextInputFormat.class);
  FileInputFormat.addInputPath(job, new Path(TEST_ROOT_DIR + "/in"));
  FileOutputFormat.setOutputPath(job, new Path(TEST_ROOT_DIR + "/out"));
  assertTrue(job.waitForCompletion(false));
  String out = readFile("out/part-r-00000");
  System.out.println(out);
  assertEquals("a\t1\ncount\t1\nis\t1\nmore\t1\nof\t1\ntest\t4\nthis\t1\nword\t1\n",
               out);
  Counters ctrs = job.getCounters();
  System.out.println("Counters: " + ctrs);
  long combineIn = ctrs.findCounter(COUNTER_GROUP,
                                    "COMBINE_INPUT_RECORDS").getValue();
  long combineOut = ctrs.findCounter(COUNTER_GROUP, 
                                     "COMBINE_OUTPUT_RECORDS").getValue();
  long reduceIn = ctrs.findCounter(COUNTER_GROUP,
                                   "REDUCE_INPUT_RECORDS").getValue();
  long mapOut = ctrs.findCounter(COUNTER_GROUP, 
                                 "MAP_OUTPUT_RECORDS").getValue();
  assertEquals("map out = combine in", mapOut, combineIn);
  assertEquals("combine out = reduce in", combineOut, reduceIn);
  assertTrue("combine in > combine out", combineIn > combineOut);
  String group = "Random Group";
  CounterGroup ctrGrp = ctrs.getGroup(group);
  assertEquals(0, ctrGrp.size());
}

开发者ID:koichi626，项目名称:hadoop-gpu，代码行数:42，代码来源:TestMapReduceLocal.java

注：本文中的org.apache.hadoop.examples.WordCount类示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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Java WordCount类代码示例

示例1: runWordCount

示例2: getExamplesJarPath

示例3: runSecondarySort

示例4: runWordCount

示例5: runWordCount

示例6: runSecondarySort

示例7: runWordCount

示例8: runWordCount

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