Che cosa significa "(say)" in questo metodo Java?
Since
Mapper
andReducer
are separate classes, the type parameters have different scopes, and the actual type argument ofKEYIN
(say) in theMapper
may be different from the type of the type parameter of the same name (KEYIN
) in theReducer
. For instance, in the maximum temperature example from earlier chapters,KEYIN
in replaced bylongWritaeble
for theMapper
and byText
for theReducer
.
Da Hadoop The Definitive Guide, di Tom White, pagina 224 (versione scannerizzata della pagina 223 e 224 ).