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Hadoop counter
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?