Josh Elser commented on ACCUMULO-4501:

Initial wag at an implementation. https://github.com/apache/accumulo/pull/168

*Very* much a work-in-progress.

* Histogram implementation is very naive
* Lots of making internally classes public instead of adding to 1k+ LOC files
* Some simple tests which show basic correctness

Feedback on approach welcome. Will be a nights+weekends thing, so I will not be 
super responsive on this.

> Add support to RFile to track and store the histogram
> -----------------------------------------------------
>                 Key: ACCUMULO-4501
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4501
>             Project: Accumulo
>          Issue Type: Sub-task
>          Components: client, tserver
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>          Time Spent: 10m
>  Remaining Estimate: 0h
> Modify RFile such that it can build the histogram and store it in an RFile.
> Reading the RFile would deserialize the histogram back into memory.

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