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HBase >> mail # user >> speeding up rowcount

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speeding up rowcount

I have been doing a rowcount via mapreduce and its taking about 4-5 hours to
count a 500million rows in a table. I was wondering if there are any map
reduce tunings I can do so it will go much faster.

I have 10 node cluster, each node with 8CPUs with 64GB of memory. Any tuning
advice would be much appreciated.
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