即使我设置了map输出键类和map输出值类，我仍然从map中得到类型不匹配。这是我的示例代码。publicclassNgramCount{protectedfinalstaticStringRAWCOUNTDIR="raw−counts";publicstaticclasscountMapextendsMapper{privatefinalstaticIntWritableone=newIntWritable(1);publicvoidmap(LongWritablekey,Textvalue,OutputCollectoroutput,Reporterreporter)throwsI