莱布尼兹

todo

1.simple workflow of running a job2.MR handled by streaming or pipe process from which out of java programs 3.report job or  task stauts from TT to client through JT  ============Tas...

it is a trick to understand  the shuffle principle in hadoop.let us to learn together.if u find something wrong in this descriptions,please tell me why :)here is a 4 maps + 3 reds 1.why ...

as i reviewed the book,it saied:a.it 's goal is to let each user fairly share the cluster resourcesb.jobs are placed in pools,and each user has their own pool.c.u can set the priorify of a...

hbase本身已经提供了实时查询功能了,如bloom filters等.如果加入mr的话,那么好处是什么呢? 如果使用mr对hbase中的数据进行非实时性的统计分析,这是可行的,但这样已经有了替代方案:hive.这正如pig基于hadoop一样,将mr的业务抽取出来了. references:http://hadoop.nchc.org.tw/phpbb/viewtopic...