Implementation of the ‘FileSelectionPolicy’ enum.
Specifies policy to select a file to uptier based on file access or modification time. eg. A file can be selected to uptier if it has been accessed in the HotFileWindow or it is modified. enum: kLastAccessed, kLastModified. Specifies policy for file selection in data uptier jobs. ‘kLastAccessed’: Uptier the files which are accessed for at least num_file_access in hot_file_window. ‘kLastModified’: Uptier the files which are modified.
KLASTACCESSED: TODO: type description here. KLASTMODIFIED: TODO: type description here.