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HBase, mail # user - what's the typical scan latency?

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what's the typical scan latency?
Liu, Raymond 2013-06-03, 08:30

If all the data is already in RS blockcache.
Then what's the typical scan latency for scan a few rows from a say several GB table ( with dozens of regions ) on a small cluster with say 4 RS ?

A few ms? Tens of ms? Or more?

Best Regards,
Raymond Liu