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From Lars George <lars.geo...@gmail.com>
Subject Re: Region server memory configuration question
Date Thu, 25 Nov 2010 19:00:45 GMT
Hi Rod,

I guess you will have to be careful setting them right. The
hbase.regionserver.global.memstore.upperLimit does not allocate
anything but acts as a barrier or threshold to flush data out. If you
were to set this to 1.0 then it would never trigger, while only
relying on the other triggers to flush data. And with
hfile.block.cache.size you could overdo it and have the server trying
to store to much data in memory triggering mayhem along the way.

No hard and fast rule but keep them close to what they are set to and
test any change in either in any direction very thoroughly.

Lars

On Thu, Nov 25, 2010 at 7:06 PM, Rod MacDonald <r.w.macdon@gmail.com> wrote:
> What is the relationship between the following configuration parameters?
> hfile.block.cache.size
> hbase.regionserver.global.memstore.upperLimit
>
> Is having the sum of the two values >= 1 a problem?
> That is, will the region server have problems with OutOfMemory if
>  hfile.block.cache.size=.6 and
> hbase.regionserver.global.memstore.upperLimit=.4?
>
> Thanks,
> Rod
>

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