Josh Elser commented on ACCUMULO-4500:

bq. can we also it configurable to turn off and on

bq. in favor of making a configurable per table function

Agreed. Hadn't started thinking about this yet. Just wanted to build the 
support into RFile first.

bq. turn it on, only new ingest and files that get compacted would have the 
info. If you turn have it on, then turn it off, new data would not have it and 
compactions would not write it back out

This brings up a good point. Through the hypothetical client API, perhaps we 
could return some info that the histogram is incomplete (when we see that we 
touched a file which did not have the information computed).

> Implement visibility histograms as a table feature
> --------------------------------------------------
>                 Key: ACCUMULO-4500
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4500
>             Project: Accumulo
>          Issue Type: New Feature
>          Components: client, tserver
>            Reporter: Josh Elser
> Add support to quickly extract a histogram of all of the visibilities stored 
> in an Accumulo table.
> https://lists.apache.org/thread.html/df5e764362a95277344fd2731a432e9fafc60595e7d30015d9a56b9c@%3Cdev.accumulo.apache.org%3E

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