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Posted to dev@hbase.apache.org by Ted Yu <yu...@gmail.com> on 2013/01/28 23:14:08 UTC

resevoir blocks for region server

Hi,
Analyzing a heap dump, I saw that LinkedList of HRegionServer took up
noticeable space - namely 4 chunks of 5MB each.

Here is related entry from refguide:
hbase.regionserver.nbreservationblocks

The number of resevoir blocks of memory release on OOME so we can cleanup
properly before server shutdown.

Default: 4

I wonder if we can reduce the size of resevoir blocks.

Cheers

Re: resevoir blocks for region server

Posted by Ted Yu <yu...@gmail.com>.

Thanks for the comment, J-D.

I will log a JIRA for this tomorrow if nobody objects.

On Mon, Jan 28, 2013 at 2:18 PM, Jean-Daniel Cryans <jd...@apache.org>wrote:

> Since we default to OnOutOfMemoryError kill -9 then we should just get
> rid of it IMO.
>
> J-D
>
> On Mon, Jan 28, 2013 at 2:14 PM, Ted Yu <yu...@gmail.com> wrote:
> > Hi,
> > Analyzing a heap dump, I saw that LinkedList of HRegionServer took up
> > noticeable space - namely 4 chunks of 5MB each.
> >
> > Here is related entry from refguide:
> > hbase.regionserver.nbreservationblocks
> >
> > The number of resevoir blocks of memory release on OOME so we can cleanup
> > properly before server shutdown.
> >
> > Default: 4
> >
> > I wonder if we can reduce the size of resevoir blocks.
> >
> > Cheers
>

Re: resevoir blocks for region server

Posted by Jean-Daniel Cryans <jd...@apache.org>.

Since we default to OnOutOfMemoryError kill -9 then we should just get
rid of it IMO.

J-D

On Mon, Jan 28, 2013 at 2:14 PM, Ted Yu <yu...@gmail.com> wrote:
> Hi,
> Analyzing a heap dump, I saw that LinkedList of HRegionServer took up
> noticeable space - namely 4 chunks of 5MB each.
>
> Here is related entry from refguide:
> hbase.regionserver.nbreservationblocks
>
> The number of resevoir blocks of memory release on OOME so we can cleanup
> properly before server shutdown.
>
> Default: 4
>
> I wonder if we can reduce the size of resevoir blocks.
>
> Cheers