简述mapreduce工作原理

页面:/news/view-621377/ | 耗时:0.8257 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=621377 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=621377 LIMIT 0,1
select * from tbl_Articles_sphinx where id=621377 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2948920,2946235,2507869,119777,112626,3386251,1490798,2795139,2307525,3462412,1465234,1853249,110413,2744228,3319903,3157935,119979,2168307,2699743,2784756,1977975,2093551,155423,624155,1285022,1131041,2451901,1764487,120369,3388179) ORDER BY field (ArticleID,2948920,2946235,2507869,119777,112626,3386251,1490798,2795139,2307525,3462412,1465234,1853249,110413,2744228,3319903,3157935,119979,2168307,2699743,2784756,1977975,2093551,155423,624155,1285022,1131041,2451901,1764487,120369,3388179)