Null Pointer Exception in mapreduce and GlobStatus - hadoop

Question

I recently came across an issue when using Hadoop FileSystem API and GlobStatus while writing Mapreduce application.
Here's snippet of the driver program.
FileSystem fs = FileSystem.get(URI.create(args[0]), conf);
Path path = new Path(args[0] + args[1]);
FileStatus[] status = fs.globStatus(path);
Path[] paths = FileUtil.stat2Paths(status);
and here is how I invoke the program
yarn jar MyMapReduceTest01.jar com.abc.test.MyMapRedTestDriver /user/root/raw_data/ abc*
This results in the following exception
Exception in thread "main" java.lang.NullPointerException
at com.abc.test.MyMapRedTestDriver.run(MyMapRedTestDriver.java:42)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
at com.abc.test.MyMapRedTestDriver.main(MyMapRedTestDriver.java:77)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
The files in the /user/root/raw_data/ directory are named as
abc_01.txt
abc_02.txt
...

Answer 1

there seems to be a problem in the way the globstatus is handled in the Hadoop filesystem API.
To make the above program work without any code change I just needed to change the command to
yarn jar MyMapReduceTest01.jar com.abc.test.MyMapRedTestDriver /user/root/raw_data/ abc_*