public Copier setMetaLogDir(Optional<String> metaLogDir) {
            this.metaLogDir = metaLogDir;
            return this;
        }
Set the current metadata log directory.

@param metaLogDir    The metadata log directory, or Optional.empty if there is none.

@return              This copier.
metadata/src/main/java/org/apache/kafka/metadata/properties/MetaPropertiesEnsemble.java