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

Introduction

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

Prototype

@Deprecated
public void createSymlink() 

Source Link

Document

Originally intended to enable symlinks, but currently symlinks cannot be disabled.

Usage

From source file:dz.lab.mapred.exclude.StartsWithCountJob_DistCacheAPI.java

@Override
public int run(String[] args) throws Exception {
    Configuration conf = getConf();
    // the following property will enable mapreduce to use its packaged local job runner
    //conf.set("mapreduce.framework.name", "local");

    Job job = Job.getInstance(conf, "StartsWithCountJob");
    job.setJarByClass(getClass());//w w w .j a va2  s  .c o m

    // configure output and input source
    TextInputFormat.addInputPath(job, new Path(args[0]));
    job.setInputFormatClass(TextInputFormat.class);

    // configure mapper and reducer
    job.setMapperClass(StartsWithCountMapper.class);
    job.setCombinerClass(StartsWithCountReducer.class);
    job.setReducerClass(StartsWithCountReducer.class);

    // configure output
    TextOutputFormat.setOutputPath(job, new Path(args[1]));
    job.setOutputFormatClass(TextOutputFormat.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);

    Path toCache = new Path("/training/data/startWithExcludeFile.txt");
    // add file to cache
    job.addCacheFile(toCache.toUri());
    // create symbolic links for all files in DistributedCache; without the links you would have to use fully qualified path
    job.createSymlink();

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

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