question: public void dumpNodes ( Path webGraphDb , DumpType type , long topN , Path output , boolean asEff , NameType nameType , AggrType aggrType , boolean asSequenceFile ) throws Exception { SimpleDateFormat sdf = new SimpleDateFormat ( "yyyy-MM-dd HH:mm:ss" ) ; long start = System . currentTimeMillis ( ) ; LOG . info ( "NodeDumper: starting at " + sdf . format ( start ) ) ; Path nodeDb = new Path ( webGraphDb , WebGraph . NODE_DIR ) ; Configuration conf = getConf ( ) ; JobConf dumper = new NutchJob ( conf ) ; dumper . setJobName ( "NodeDumper: " + webGraphDb ) ; FileInputFormat . addInputPath ( dumper , nodeDb ) ; dumper . setInputFormat ( SequenceFileInputFormat . class ) ; if ( nameType == null ) { dumper . setMapperClass ( Sorter . class ) ; dumper . setReducerClass ( Sorter . class ) ; dumper . setMapOutputKeyClass ( FloatWritable . class ) ; dumper . setMapOutputValueClass ( Text . class ) ; } else { dumper . setMapperClass ( Dumper . class ) ; dumper . setReducerClass ( Dumper . class ) ; dumper . setMapOutputKeyClass ( Text . class ) ; dumper . setMapOutputValueClass ( FloatWritable . class ) ; } dumper . setOutputKeyClass ( Text . class ) ; dumper . setOutputValueClass ( FloatWritable . class ) ; FileOutputFormat . setOutputPath ( dumper , output ) ; if ( asSequenceFile ) { dumper . setOutputFormat ( SequenceFileOutputFormat . class ) ; } else { dumper . setOutputFormat ( TextOutputFormat . class ) ; } dumper . setNumReduceTasks ( 1 ) ; dumper . setBoolean ( "inlinks" , type == DumpType . INLINKS ) ; dumper . setBoolean ( "outlinks" , type == DumpType . OUTLINKS ) ; dumper . setBoolean ( "scores" , type == DumpType . SCORES ) ; dumper . setBoolean ( "host" , nameType == NameType . HOST ) ; dumper . setBoolean ( "domain" , nameType == NameType . DOMAIN ) ; dumper . setBoolean ( "sum" , aggrType == AggrType . SUM ) ; dumper . setBoolean ( "max" , aggrType == AggrType . MAX ) ; dumper . setLong ( "topn" , topN ) ; if ( asEff ) { dumper . set ( "mapred.textoutputformat.separator" , "=" ) ; } try { LOG . info ( "NodeDumper: running" ) ; JobClient . runJob ( dumper ) ; } catch ( IOException e ) { LOG . error ( StringUtils . stringifyException ( e ) ) ; throw e ; } long end = System . currentTimeMillis ( ) ; LOG . info ( "NodeDumper: finished at " + sdf . format ( end ) + ", elapsed: " + TimingUtil . elapsedTime ( start , end ) ) ; }
target:  Runs the process to dump the top urls out to a text file.