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MapReduce, mail # user - log server for hadoop MR jobs??

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log server for hadoop MR jobs??
Xiaowei Li 2013-01-11, 18:28

 is there a facility, or a log server, to collect all log generated from
each mapper/reducer of a MR job, in a centralized place, or unified log
file on HDFS?

now i look at logs in a naive way: go to jobtracker to check each task....