public FaunusPipeline back ( final String step ) { this . state . assertNotLocked ( ) ; this . state . assertNoProperty ( ) ; this . compiler . addMapReduce ( BackFilterMapReduce . Map . class , BackFilterMapReduce . Combiner . class , BackFilterMapReduce . Reduce . class , LongWritable . class , Holder . class , NullWritable . class , FaunusVertex . class , BackFilterMapReduce . createConfiguration ( this . state . getElementType ( ) , this . state . getStep ( step ) ) ) ; makeMapReduceString ( BackFilterMapReduce . class , step ) ; return this ; }
Go back to an element a named step ago . Currently only backing up to vertices is supported .