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From stack <saint....@gmail.com>
Subject Re: [DISCUSS] Planning changes on RegionServer totalRequestCount metrics
Date Fri, 04 Aug 2017 05:59:50 GMT
+1

We need a fat release note on this change so operators can quickly learn
why traffic went down on upgrade.

S

On Aug 3, 2017 14:49, "Yu Li" <carp84@gmail.com> wrote:

> Dear all,
>
> Recently in HBASE-18469 <https://issues.apache.org/jira/browse/HBASE-18469
> >
> we found some inconsistency on regionserver request related metrics,
> including:
> 1. totalRequestCount could be less than readRequestCount+writeRequestCount
> 2. For multi request, we count action count into totalRequestCount, while
> for scan with caching we count only one.
>
> To fix the inconsistency, we plan to make below changes:
> 1. Make totalRequestCount only counts rpc request, thus multi request will
> only count as one for totalRequestCount
> 2. Introduce a new metrics in name of "totalRowsRequestCount", which will
> count the DML workloads on RS by row-level action, and for this metrics we
> will count how many rows included for multi and scan-with-caching request.
>
> After the change, there won't be any compatibility issue -- existing
> monitoring system could still work -- only that totalRequestCount will be
> less than previous. And it's recommended to use totalRowsRequestCount to
> check the RS DML workload.
>
> Please kindly let us know if you have any different idea or suggestion
> (operators' opinion is especially welcomed).
>
> Let's make this discussion open for 72 hours and will make the change if no
> objections.
>
> Thanks!
>
> Best Regards,
> Yu
>

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