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Hadoop, mail # user - MapReduce tunning

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MapReduce tunning
Mohit Anchlia 2012-02-25, 06:36
I am looking at some hadoop tuning parameters like io.sort.mb,
mapred.child.javaopts etc.

- My question was where to look at for current setting
- Are these settings configured cluster wide or per job?
- What's the best way to look at reasons of slow performance?