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From Lin Ma <lin...@gmail.com>
Subject Hadoop counter
Date Fri, 19 Oct 2012 10:50:30 GMT
Hi guys,

I have some quick questions regarding to Hadoop counter,


   - Hadoop counter (customer defined) is global accessible (for both read
   and write) for all Mappers and Reducers in a job?
   - What is the performance and best practices of using Hadoop counters? I
   am not sure if using Hadoop counters too heavy, there will be performance
   downgrade to the whole job?

regards,
Lin

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