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From Ted Yu <yuzhih...@gmail.com>
Subject Re: requests count per HRegion and rebalance
Date Mon, 07 Feb 2011 18:26:02 GMT
About 'number of GC cycles per GC type', is there API to get this
information ?

Regards

On Mon, Feb 7, 2011 at 10:02 AM, tsuna <tsunanet@gmail.com> wrote:

> On Mon, Feb 7, 2011 at 9:12 AM, Ted Yu <yuzhihong@gmail.com> wrote:
> > This is a good suggestion.
> > We also need to consider the situation where source RS is under heavy
> load,
> > facing potential GC pause. In this case we shouldn't expect source RS to
> > carry on too much computation.
>
> Whenever things fail unexpectedly, we can always fall back to the
> current way of migrating regions (expensive for clients but easier for
> the server).
>
> Note that the problem is also valid if the destination RS is having
> load / GC issues.  But hopefully once we expose proper load metrics,
> the master will be able to make good load balancing decisions.  If the
> master has information such as QPS per region, latency per region,
> number of GC cycles per GC type, then it can get a pretty clear
> picture of the load of each RS and try to even it out.
>
> --
> Benoit "tsuna" Sigoure
> Software Engineer @ www.StumbleUpon.com
>

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