private Path metaDataExportFile() throws SemanticException {
      return new Path(metadataExportRootDir(), EximUtil.METADATA_NAME);
    }
Access to the {@link #dataExportRootDir} should only be done via this method
since the creation of the directory is delayed until we figure out if we want
to write something or not. This is specifically important to prevent empty non-native
directories being created in repl dump.
ql/src/java/org/apache/hadoop/hive/ql/parse/repl/dump/TableExport.java