question: public List < Long > generateBuckets ( ) throws FileNotFoundException , UnsupportedEncodingException { logger . info ( "Generating buckets for: " + dataType . toString ( ) + " with prune factor: " + pruneFactor ) ; List < Long > buckets = createBuckets ( ) ; System . gc ( ) ; if ( pruneFactor != 0 ) { buckets = pruneBucket ( buckets , pruneFactor ) ; System . gc ( ) ; } if ( dataType . equals ( FieldDataType . DOUBLE ) ) { logger . info ( "Special case for double; adding a set of low buckets for high precision on lower numbers." ) ; for ( int i = 0 ; i < 10000 ; i ++ ) { logger . debug ( "Adding " + i ) ; buckets . add ( new Long ( i ) ) ; } for ( int i = 10000 ; i < 100000 ; i = i + 2 ) { logger . debug ( "Adding " + i ) ; buckets . add ( new Long ( i ) ) ; } for ( int i = 100000 ; i < 1000000 ; i = i + 10 ) { logger . debug ( "Adding " + i ) ; buckets . add ( new Long ( i ) ) ; } } if ( useNegativeBuckets ) { buckets = addNegativeBuckets ( buckets ) ; System . gc ( ) ; } Collections . sort ( buckets ) ; return buckets ; }
target:  Does the actual work.