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Posted to user@hbase.apache.org by Yves Langisch <yv...@langisch.ch> on 2012/01/23 23:50:30 UTC
early memstore flushings
Hi,
I'm currently looking through all the metrics hbase provides and I don't understand the memstore flushing behavior I see. I thought the memstore is not flushed until it reaches the maximum memstore size plus the flush size. In my case this would be 1.6GB+128MB. But I see the following graph:
http://dl.dropbox.com/u/395716/memstore.gif
What's the reason for such early flushes?
-
Yves
Re: early memstore flushings
Posted by Mikael Sitruk <mi...@gmail.com>.
Your memstore may be flushed also in case the number of HLog reach its
maximum, in this case your memstore may not reach the max size allocated
for it.
Mikael.S
On Tue, Jan 24, 2012 at 1:00 AM, Jean-Daniel Cryans <jd...@apache.org>wrote:
> It flushes when it reaches the memstore size, not plus the global max
> memstore size.
>
> J-D
>
> On Mon, Jan 23, 2012 at 2:50 PM, Yves Langisch <yv...@langisch.ch> wrote:
> > Hi,
> >
> > I'm currently looking through all the metrics hbase provides and I don't
> understand the memstore flushing behavior I see. I thought the memstore is
> not flushed until it reaches the maximum memstore size plus the flush size.
> In my case this would be 1.6GB+128MB. But I see the following graph:
> >
> > http://dl.dropbox.com/u/395716/memstore.gif
> >
> > What's the reason for such early flushes?
> >
> > -
> > Yves
>
--
Mikael.S
Re: early memstore flushings
Posted by Jean-Daniel Cryans <jd...@apache.org>.
It flushes when it reaches the memstore size, not plus the global max
memstore size.
J-D
On Mon, Jan 23, 2012 at 2:50 PM, Yves Langisch <yv...@langisch.ch> wrote:
> Hi,
>
> I'm currently looking through all the metrics hbase provides and I don't understand the memstore flushing behavior I see. I thought the memstore is not flushed until it reaches the maximum memstore size plus the flush size. In my case this would be 1.6GB+128MB. But I see the following graph:
>
> http://dl.dropbox.com/u/395716/memstore.gif
>
> What's the reason for such early flushes?
>
> -
> Yves