Delete hdfs folder from java

I do it this way:

    Configuration conf = new Configuration();
    conf.set("fs.hdfs.impl",org.apache.hadoop.hdfs.DistributedFileSystem.class.getName());
    conf.set("fs.file.impl",org.apache.hadoop.fs.LocalFileSystem.class.getName());
    FileSystem  hdfs = FileSystem.get(URI.create("hdfs://<namenode-hostname>:<port>"), conf);
    hdfs.delete("/path/to/your/file", isRecursive);

you don't need hdfs://hdfshost:port/ in your file path

This works for me.

Just add the following codes in my WordCount program will do:

import org.apache.hadoop.fs.*;

...
Configuration conf = new Configuration();

Path output = new Path("/the/folder/to/delete");
FileSystem hdfs = FileSystem.get(URI.create("hdfs://namenode:port"),conf);

// delete existing directory
if (hdfs.exists(output)) {
    hdfs.delete(output, true);
}

Job job = Job.getInstance(conf, "word count");
...

You need to add hdfs://hdfshost:port explicitly to get distributed file system. Else the code will work for local file system only.