@InterfaceAudience.Public
    public boolean setMap(Mapper mapBlock, String version) {
        return setMapReduce(mapBlock, null, version);
    }
@ InterfaceAudience . Public public boolean setMap ( Mapper mapBlock , String version ) { return setMapReduce ( mapBlock , null , version ) ; }
Defines a view that has no reduce function.
See setMapReduce() for more information.