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From Mikhail Antonov <olorinb...@gmail.com>
Subject Re: Retiring empty regions
Date Fri, 01 Apr 2016 05:31:26 GMT
Crazy idea, but you might be able to take stripped down version of region
normalizer code and make a Tool to run? Requesting split or merge is done
through the client API, and the only weighing information you need is
whether region empty or not, that you could find out too?

"Short of upgrading to 1.2 for the region normalizer,"

A bit off topic, but I think unfortunately region normalizer now ignores
empty regions to avoid undoing pre-split on the table. This is something
which makes it far less useful for time-series databases with short TTL on
the tables. We'll need to address that.


On Thu, Mar 31, 2016 at 9:56 PM, Nick Dimiduk <ndimiduk@gmail.com> wrote:

> Hi folks,
> I have a table with TTL enabled. It's been receiving data for a while
> beyond the TTL and I now have a number of empty regions. I'd like to drop
> those empty regions to free up heap space on the region servers and reduce
> master load. I'm running a 1.1 derivative.
> The only threads I found on this topic are from circa 0.92 timeframe.
> Short of upgrading to 1.2 for the region normalizer, what's the recommended
> method of cleaning up this cruft? Should I be merging empty regions into
> their neighbor's? Looks like region merge hasn't been migrated to ProcV2
> yet so would be wise to reduce online table activity, or at least aim for a
> "quiet period"? Is there a documented process for off-lining and deleting a
> region by name? I don't see anything in the book about it.
> I experimented with online merge on pseudodist, looks like it's working
> fine for the most basic case. I'll probably pursue this unless someone has
> some other ideas.
> Thanks,
> Nick

Michael Antonov

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