Access permission to cachepath and datapath files

[kechen2013]

I have been having the following issue while running Crail-Spark-TeraSort. It looks like an access permission problem in cachepath and datapath that occurs inside MappedBufferCache's constructor. This is probably because I am using Cloudera Hadoop, and it uses other usernames such as "yarn", "hdfs" for YARN and HDFS.

...
WARN scheduler.DAGScheduler: Creating new stage failed due to exception - job: 0
java.lang.NullPointerException
at com.ibm.crail.memory.MappedBufferCache.(MappedBufferCache.java:55)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
...

I was running Crail-TeraSort with my own username. But "yarn" is also creating some cache file as below. So essentially the files are created by a different user than the one trying to read them.
ls -lth /memory/cache/
drwxrwxrwx 2 yarn hadoop 4.0K Dec 6 17:06 1512608812456
drwxrwxrwx 2 yarn hadoop 4.0K Dec 5 11:43 1512503023326

I was wondering if there is a way to permanently fix it? For example, does it help to change the access permission when creating RandomAccessFile for MappedBufferCache in the datapath?
RandomAccessFile dataFile = new RandomAccessFile(dataFilePath, "rw"); // (MappedBufferCache.java:89)

Thanks,
Kevin