question: called once for each key/value pair in the input split . most applications should override this , but the default is the identity function . concode_field_sep long records concode_field_sep void cleanup concode_elem_sep void setup concode_elem_sep void run
target: void function ( KEYIN arg0 , VALUEIN arg1 , Context arg2 ) { arg2 . write ( ( KEYOUT ) arg0 , ( VALUEOUT ) arg1 ) ; }