There are few methods on MiniDFSCluster class that are declared as static (getBlockFile, getStorageDirPath), though as long as MiniDFSCluster is not a singleton they should be instance methods not class methods. In my tests I see that starting second instance of MiniDFSCluster invalidates the first instance if I don’t change cluster base directory (existing data directory is fully deleted), but at the same time static declaration of getBlockFile and getStorageDirPath does not allow base directory to be changed without affecting functionality.
Thank you, Vlad
