Running Ex1 on Windows

If you try to run the first exercise on Windows, most likely you'll see something like this:

java.io.IOException: Failed to set permissions of path: \tmp\hadoop-username\mapred\staging\username1953997422\.staging to 0700

If you don't want to use a virtual machine, here's a workaroud:

First, download this jar and add it to the classpath

Then modify the first couple of lines in HadoopJob#prepareJob()

Configuration conf = getConf();
conf.set("hadoop.tmp.dir", "c:/tmp/");
conf.set("fs.file.impl", "com.conga.services.hadoop.patch.HADOOP_7682.WinLocalFileSystem");
Job job = new Job(new Configuration(conf));

That's it, now you can run the unit tests

Source:

• https://github.com/congainc/patch-hadoop_7682-1.0.x-win