Example usage for org.apache.hadoop.mapreduce Job setMapperClass

Introduction

In this page you can find the example usage for org.apache.hadoop.mapreduce Job setMapperClass.

Prototype

public void setMapperClass(Class<? extends Mapper> cls) throws IllegalStateException 

Source Link

Document

Set the Mapper for the job.

Usage

From source file:com.jhkt.playgroundArena.hadoop.tasks.jobs.AverageMultipleOutputJob.java

License:Apache License

@Override
public int run(String[] args) throws Exception {

    Configuration conf = getConf();
    Job job = new Job(conf, AverageMultipleOutputJob.class.getSimpleName());
    job.setJarByClass(AverageMultipleOutputJob.class);

    Path in = new Path(args[0]);
    Path out = new Path(args[1]);

    FileInputFormat.setInputPaths(job, in);
    FileOutputFormat.setOutputPath(job, out);

    job.setJobName("Sample Multiple Output Job");
    job.setMapperClass(AverageMapper.class);
    job.setReducerClass(AverageMultipleOutputReducer.class);

    job.setInputFormatClass(TextInputFormat.class);
    job.setOutputFormatClass(TextOutputFormat.class);
    job.setOutputKeyClass(IntWritable.class);
    job.setOutputValueClass(IntWritable.class);

    MultipleOutputs.addNamedOutput(job, "greaterThan1000", TextOutputFormat.class, Text.class,
            DoubleWritable.class);
    MultipleOutputs.addNamedOutput(job, "lessThan1000", TextOutputFormat.class, Text.class,
            DoubleWritable.class);

    System.exit(job.waitForCompletion(true) ? 0 : 1);

    return 0;/*from   w  w w  . j  ava 2  s  .  c  om*/
}

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From source file:com.jhkt.playgroundArena.hadoop.tasks.jobs.BloomFilterJob.java

License:Apache License

@Override
public int run(String[] args) throws Exception {

    Configuration conf = getConf();
    Job job = new Job(conf, BloomFilterJob.class.getSimpleName());
    job.setJarByClass(BloomFilterJob.class);

    Path in = new Path(args[0]);
    Path out = new Path(args[1]);

    FileInputFormat.setInputPaths(job, in);
    FileOutputFormat.setOutputPath(job, out);

    job.setJobName("Sample BloomFilter Job");
    job.setMapperClass(BloomFilterMapper.class);
    job.setReducerClass(BloomFilterReducer.class);
    job.setNumReduceTasks(1);/*from   w w w  .jav  a 2s.  com*/

    job.setInputFormatClass(TextInputFormat.class);

    /*
     * We want our reducer to output the final BloomFilter as a binary file. I think 
     * Hadoop doesn't have this format [check later], so using NullOutpuFormat.class.
     * 
     * In general life gets a little more dangerous when you deviate from MapReduce's input/output 
     * framework and start working with your own files. Your tasks are no longer guaranteed to be idempotent 
     * and you'll need to understand how various failure scenarios can affect your tasks. For example, your files 
     * may only be partially written when some tasks are restarted. Our example here is safe(r) because all the file 
     * operations take place together only once in the close() method and in only one reducer. A more 
     * careful/paranoid implementation would check each individual file operation more closely.
     */
    job.setOutputFormatClass(NullOutputFormat.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(BloomFilter.class);

    System.exit(job.waitForCompletion(true) ? 0 : 1);

    return 0;
}

---

From source file:com.jhkt.playgroundArena.hadoop.tasks.jobs.CountJob.java

License:Apache License

@Override
public int run(String[] args) throws Exception {

    Configuration conf = getConf();
    Job job = new Job(conf, CountJob.class.getSimpleName());
    job.setJarByClass(CountJob.class);

    Path in = new Path(args[0]);
    Path out = new Path(args[1]);

    FileInputFormat.setInputPaths(job, in);
    FileOutputFormat.setOutputPath(job, out);

    job.setJobName("Sample Count Job");
    job.setMapperClass(CountMapper.class);
    job.setReducerClass(CountReducer.class);

    job.setInputFormatClass(TextInputFormat.class);
    job.setOutputFormatClass(TextOutputFormat.class);
    job.setOutputKeyClass(IntWritable.class);
    job.setOutputValueClass(IntWritable.class);

    System.exit(job.waitForCompletion(true) ? 0 : 1);

    return 0;//from www  .  ja  v  a 2s  . com
}

---

From source file:com.jhkt.playgroundArena.hadoop.tasks.jobs.DistributedCacheJob.java

License:Apache License

@Override
public int run(String[] args) throws Exception {

    Configuration conf = getConf();
    Job job = new Job(conf, DistributedCacheJob.class.getSimpleName());
    job.setJarByClass(DistributedCacheJob.class);

    /*/*from ww w .  j av a2  s. c  om*/
     * The following will disseminate the file to all the nodes and the file defaults to HDFS.
     * The second and third arguments denote the input and output paths of the standard Hadoop 
     * job. Note that we've limited the number of data sources to two. This is not an inherent 
     * limitation of the technique, but a simplification that makes our code easier to follow.
     */
    //job.addCacheFile(new Path(args[0]).toUri());

    Path in = new Path(args[1]);
    Path out = new Path(args[2]);

    FileInputFormat.setInputPaths(job, in);
    FileOutputFormat.setOutputPath(job, out);

    job.setJobName("Sample DistributedCache Job");
    job.setMapperClass(DistributedCacheMapper.class);

    /*
     * Took out the Reduce class as the plan is performing the joining in the map phase and will 
     * configure the job to have no reduce.
     */
    job.setNumReduceTasks(0);

    job.setInputFormatClass(TextInputFormat.class);
    job.setOutputFormatClass(TextOutputFormat.class);

    System.exit(job.waitForCompletion(true) ? 0 : 1);

    return 0;
}

---

From source file:com.jumptap.h2redis.RedisDriver.java

License:Open Source License

@Override
public int run(String[] args) throws Exception {
    if (args.length < 5) {
        usage();/*from w  ww  .j a v  a2  s  .c o  m*/
        return 1;
    }

    Map<String, String> argMap = new HashMap<String, String>();
    String[] kv;

    for (String arg : args) {
        kv = arg.split("=");
        if (kv.length != 2) {
            usage();
            return 1;
        }
        argMap.put(kv[0].trim(), kv[1]);
    }

    Configuration conf = getConf();
    String[] hostPort = argMap.get(REDIS_CMD).split(":");
    conf.set(REDIS_HOST, hostPort[0].trim());
    conf.setInt(REDIS_PORT, Integer.valueOf(hostPort[1].trim()));
    conf.setInt(REDIS_KEY_FIELD, Integer.valueOf(argMap.get(KEY_CMD).trim()));
    conf.setInt(REDIS_HASHKEY_FIELD, Integer.valueOf(argMap.get(HASH_KEY_CMD).trim()));
    conf.setInt(REDIS_HASHVAL_FIELD, Integer.valueOf(argMap.get(HASH_VAL_CMD).trim()));

    if (argMap.containsKey(REDIS_DB_CMD)) {
        conf.set(REDIS_DB, argMap.get(REDIS_DB_CMD).trim());
    }
    if (argMap.containsKey(REDIS_PW_CMD)) {
        conf.set(REDIS_PW, argMap.get(REDIS_PW_CMD).trim());
    }
    if (argMap.containsKey(KEY_PFX_CMD)) {
        conf.set(REDIS_KEY_PREFIX, argMap.get(KEY_PFX_CMD).trim());
    }
    if (argMap.containsKey(HASH_KEY_PFX_CMD)) {
        conf.set(REDIS_HASHKEY_PREFIX, argMap.get(HASH_KEY_PFX_CMD).trim());
    }
    if (argMap.containsKey(KEY_PFX_DELIM_CMD)) {
        conf.set(REDIS_KEY_PREFIX_DELIM, argMap.get(KEY_PFX_DELIM_CMD).trim());
    }
    if (argMap.containsKey(KEY_FILTER_CMD)) {
        conf.setPattern(REDIS_KEY_FILTER, Pattern.compile(argMap.get(KEY_FILTER_CMD).trim()));
    }
    if (argMap.containsKey(HASH_FILTER_CMD)) {
        conf.setPattern(REDIS_HASH_FILTER, Pattern.compile(argMap.get(HASH_FILTER_CMD).trim()));
    }
    if (argMap.containsKey(VAL_FILTER_CMD)) {
        conf.setPattern(REDIS_VAL_FILTER, Pattern.compile(argMap.get(VAL_FILTER_CMD).trim()));
    }
    if (argMap.containsKey(VAL_FILTER_CMD)) {
        conf.setPattern(REDIS_VAL_FILTER, Pattern.compile(argMap.get(VAL_FILTER_CMD).trim()));
    }
    if (argMap.containsKey(TTL_CMD)) {
        conf.setInt(REDIS_KEY_TTL, Integer.valueOf(argMap.get(TTL_CMD).trim()));
    }
    if (argMap.containsKey(TS_KEY_CMD)) {
        conf.set(REDIS_KEY_TS, argMap.get(TS_KEY_CMD).trim());
    } else {
        conf.set(REDIS_KEY_TS, "redis.lastupdate");
    }

    Job job = new Job(conf, "RedisDriver");
    FileInputFormat.addInputPath(job, new Path(argMap.get(INPUT_CMD)));
    job.setJarByClass(RedisDriver.class);
    job.setMapperClass(RedisOutputMapper.class);
    job.setNumReduceTasks(0);
    job.setInputFormatClass(TextInputFormat.class);
    job.setOutputFormatClass(RedisOutputFormat.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(Text.class);

    return job.waitForCompletion(true) ? 0 : 1;
}

---

From source file:com.juniarto.secondsorter.SsJob.java

public int run(String[] allArgs) throws Exception {
    Configuration conf = getConf();
    Job job = new Job(conf, "secondary sort");

    job.setJarByClass(SsJob.class);
    job.setPartitionerClass(NaturalKeyPartitioner.class);
    job.setGroupingComparatorClass(NaturalKeyGroupingComparator.class);
    job.setSortComparatorClass(CompositeKeyComparator.class);

    job.setMapOutputKeyClass(TextDsi.class);
    job.setMapOutputValueClass(IntWritable.class);

    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);

    job.setInputFormatClass(TextInputFormat.class);
    job.setOutputFormatClass(TextOutputFormat.class);

    job.setMapperClass(SsMapper.class);
    job.setReducerClass(SsReducer.class);
    job.setNumReduceTasks(2);/*from  www. ja va 2 s  .  com*/

    String[] args = new GenericOptionsParser(getConf(), allArgs).getRemainingArgs();
    FileInputFormat.setInputPaths(job, new Path(args[0]));
    FileOutputFormat.setOutputPath(job, new Path(args[1]));
    //job.submit();

    long time1 = System.nanoTime();
    boolean status = job.waitForCompletion(true);
    long time2 = System.nanoTime();
    long timeSpent = time2 - time1;
    LOG.info("TIME: " + timeSpent);
    return 0;

}

---

From source file:com.justgiving.raven.kissmetrics.jsonenricher.KissmetricsJsonToEnrichedJsonDriver.java

License:Open Source License

public static void main(String[] args) throws Exception {

    logger.info("Logger - Converting Kissmetrics Json to Valid Json files");
    System.out.println("Converting Kissmetrics Json to Valid Json files");
    System.out.println("defaultCharacterEncoding by property: " + System.getProperty("file.encoding"));
    System.out.println("defaultCharacterEncoding by code: " + getDefaultCharEncoding());
    System.out.println("defaultCharacterEncoding by charSet: " + Charset.defaultCharset());

    Job job = Job.getInstance();
    job.setJarByClass(KissmetricsJsonToEnrichedJsonDriver.class);
    job.setJobName("Kissmetrics Json to valid and enriched Json files");
    FileInputFormat.addInputPath(job, new Path(args[0]));
    FileOutputFormat.setOutputPath(job, new Path(args[1]));

    //Add number of reducers
    int numberOfReducers = 2;
    if (args.length > 2 && args[2] != null) {
        numberOfReducers = Integer.parseInt(args[2]);
        if (numberOfReducers <= 0) {
            numberOfReducers = 2;//from   ww  w.  j  a v  a 2s .  c  om
        }
    }

    job.setMapperClass(com.justgiving.raven.kissmetrics.jsonenricher.KissmetricsJsonToEnrichedJsonMapper.class);
    job.setMapOutputKeyClass(Text.class);
    job.setMapOutputValueClass(Text.class);
    job.setReducerClass(
            com.justgiving.raven.kissmetrics.jsonenricher.KissmetricsJsonToEnrichedJsonReducer.class);
    job.setNumReduceTasks(numberOfReducers);

    System.exit(job.waitForCompletion(true) ? 0 : 1);
}

---

From source file:com.justgiving.raven.kissmetrics.schema.KissmetricsJsonToSchemaDriver.java

License:Open Source License

public static void main(String[] args) throws Exception {

    int numberOfReducers = 1;
    if (args.length > 2 && args[2] != null) {
        numberOfReducers = Integer.parseInt(args[2]);
        if (numberOfReducers <= 0) {
            numberOfReducers = 1;/*  w  w w.  j  a va 2s .c om*/
        }
    }

    System.out.println("Kissmetrics Json Schema Extrator");

    Job job = Job.getInstance();
    job.setJarByClass(KissmetricsJsonToSchemaDriver.class);
    job.setJobName("Kissmetrics Json Schema Extrator");
    FileInputFormat.addInputPath(job, new Path(args[0]));
    FileOutputFormat.setOutputPath(job, new Path(args[1]));
    job.setMapperClass(com.justgiving.raven.kissmetrics.schema.KissmetricsJsonToSchemaMapper.class);
    job.setReducerClass(com.justgiving.raven.kissmetrics.schema.KissmetricsJsonToSchemaReducer.class);
    job.setNumReduceTasks(numberOfReducers);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(Text.class);
    System.exit(job.waitForCompletion(true) ? 0 : 1);
}

---

From source file:com.kangfoo.study.hadoop1.mp.typeformat.TestMapreduceSequenceInputFormat.java

License:Apache License

public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();
    String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
    if (otherArgs.length != 2) {
        System.err.println("Usage: TestMapreduceSequenceInputFormat <in> <out>");
        System.exit(2);/*  w  w w.  j  a v a 2  s .  com*/
    }
    Job job = new Job(conf, "TestMapreduceSequenceInputFormat");
    job.setJarByClass(TestMapreduceSequenceInputFormat.class);//?
    job.setMapperClass(TokenizerMapper.class);
    job.setCombinerClass(IntSumReducer.class);
    job.setReducerClass(IntSumReducer.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);
    job.setInputFormatClass(SequenceFileInputFormat.class); // SequenceFileInputFormat
    FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
    System.exit(job.waitForCompletion(true) ? 0 : 1);
}

---

From source file:com.kangfoo.study.hadoop1.mp.typeformat.TestMapreduceTextInputFormat.java

License:Apache License

public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();
    String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
    if (otherArgs.length != 2) {
        System.err.println("Usage: TestMapreduceTextInputFormat <in> <out>");
        System.exit(2);/*from  ww w. ja  v  a2 s  .  c o m*/
    }
    Job job = new Job(conf, "TestMapreduceTextInputFormat");
    job.setJarByClass(TestMapreduceTextInputFormat.class);//?
    job.setMapperClass(TokenizerMapper.class);
    job.setCombinerClass(IntSumReducer.class);
    job.setReducerClass(IntSumReducer.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);
    FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
    System.exit(job.waitForCompletion(true) ? 0 : 1);
}

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