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From N Keywal <nkey...@gmail.com>
Subject Re: hbase heap size beyond 16G ?
Date Tue, 08 Nov 2011 23:53:41 GMT
If your're interested, some good slides on GC (slide 45 and after):
http://www.azulsystems.com/sites/www.azulsystems.com/SpringOne2011_UnderstandingGC.pdf

On Tue, Nov 8, 2011 at 11:25 PM, Mikael Sitruk <mikael.sitruk@gmail.com>wrote:

> Concurrent GC (a.k.a CMS) does not mean that there is no more pause. The
> pauses are reduced to minimum but can still happen especially if the
> concurrent thread will not finish their work under high pressure. The G1
> collector in JDK 7.0 pretends to be a better collector than CMS, but i
> presume tests will need to be done to validate this.
> BTW the CMS collector is the one that is recommented in the book.
>
> Mikael.S
>
> On Tue, Nov 8, 2011 at 11:57 PM, Sujee Maniyam <sujee@sujee.net> wrote:
>
> > HI All
> > the HBase book by Lars warns it is not recommended to set heap size above
> > 16G, because of 'stop the world' GC.
> >
> > Does this still apply?  Specially with  'concurrentGC' ?
> >
> > thanks
> > Sujee
> > http://sujee.net
> >
>
>
>
> --
> Mikael.S
>

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