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From Eric Newton <>
Subject Re: Scanner.estimatedCount()?
Date Fri, 27 Jun 2014 14:40:22 GMT
Short answer: no.

Long answer:

You can scan the metadata table for the count/size of the files.

You can query tablet servers for the basic stats of every tablet for a
given table.  This is used for balancing.

But really you should collect the statistics you want during ingest and
insert them in another table.


On Fri, Jun 27, 2014 at 9:42 AM, Jamie Stephens <> wrote:

> Is there a way to get a quick estimate of the number of keys in a given
> range?
> Perhaps more generally, getting an estimate of the amount of work (and
> even some sort of confidence based on, say, the age of something) to
> iterate over a range.
> I'd like to do some query planning, so statistics like these sure would be
> nice.
> --Jamie

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