2018年9月1日
Wordcount -- MapReduce example -- Reducer
摘要： Reducer receives (key, values) pairs and aggregate values to a desired format, then write produced (key, value) pairs back into HDFS. E.g. Input: (ter 阅读全文
posted @ 2018-09-01 17:41 LexLuc 阅读(206) 评论(0) 推荐(0)
Wordcount -- MapReduce example -- Mapper
摘要： Mapper maps input key/value pairs into intermediate key/value pairs. E.g. Input: (docID, doc) Output: (term, 1) Mapper Class Prototype: Special Data T 阅读全文
posted @ 2018-09-01 16:41 LexLuc 阅读(296) 评论(0) 推荐(0)