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From Mikhail Antonov <olorinb...@gmail.com>
Subject Re: identifying source of region split request
Date Wed, 06 Jan 2016 18:14:19 GMT
Adding this tracing information to know who initiated split is in general
useful thing. Right now though I'm not sure I see how that would help to
make better normalization decisions? Region split failure implies
underlying FS issue? Any examples/ideas?

Kind of..collect statistics to blacklist some RSs with high failure rate
and don't attempt to split regions hosted there in future?

On Tue, Jan 5, 2016 at 2:55 PM, Ted Yu <yuzhihong@gmail.com> wrote:

> Hi,
> I recently worked on improving region normalization feature.
> If region split request triggered by the execution of
> SplitNormalizationPlan fails, there is no way of knowing whether the failed
> split originated from region normalization.
> Such association would give RegionNormalizer information so that it can
> make better normalization decisions in the subsequent invocations.
> One enhancement I can think of is to embed metadata in SplitRequest which
> gets passed through RegionStateTransitionContext when
> RegionServerServices#reportRegionStateTransition() is called.
> This way, RegionStateListener can be notified with the metadata (id of the
> requester).
> Comment is welcome.

Michael Antonov

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