for filesystem based copying of file if the copy fails due to a connection error to source Name Node, we should recreate the filesystem object.
the retry logic for local file copy should be triggered using the original source file path ( and not the CM root path ) since failure can be due to network issues between DFSClient and NN.
When listing files in tables / partition to include them in _files, we should add retry logic when failure occurs. FileSystem object here also should be recreated since the existing one might be in inconsistent state.
Task
Major
