a seemingly benign test that fails MahoutTestCase

[Wei Zhang]

Hello,

I am wrting a simple Unit test, which extends MahoutTestCase. I am using
Mahout 0.9 and Hadoop 1.0.3.

The test is quite simple, it just creates an empty file on HDFS. The entire
coding is the following:

@Test
public void simpleTest() throws IOException{
                Configuration conf = new Configuration();
                FileSystem fs = FileSystem.get(conf);
                Path filenamePath = new Path("/tmp/tmp.txt");
                FSDataOutputStream out = fs.create(filenamePath);
                out.close();
}

However, this will fail the MahoutTestCase. In particular, the moment I
added the line 4 (FSDataOutputStream out = fs.create(filenamePath);), this
test would fail.
I am wondering can anyone give me some pointers regarding why this naive
program would fail ?
The error log is attached below.

Thank you very much !

Wei