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From Bharath Vissapragada <bhara...@cloudera.com>
Subject Re: Some questions to get clear view
Date Tue, 25 Feb 2014 07:58:20 GMT
Hi Upendra,

Your argument is correct, especially when there is an uneven data
distribution across CFs in a region and this is what is discussed in
HBASE-3149.
See comments from Stack, Nicholas & Lars.

- Bharath


On Tue, Feb 25, 2014 at 12:24 PM, Upendra Yadav <upendra1024@gmail.com>wrote:

> Thanks...
>
> but for a region, why hbase need to flush other CF when one of the CF got
> memstore limit...
>
>
> On Tue, Feb 25, 2014 at 2:50 AM, Ted Yu <yuzhihong@gmail.com> wrote:
>
> > Upendra:
> > In 0.89-fb branch, the following JIRA has been integrated:
> >
> > HBASE-3149 Make flush decisions per column family
> >
> > FYI
> >
> >
> > On Mon, Feb 24, 2014 at 2:11 PM, Upendra Yadav <upendra1024@gmail.com
> > >wrote:
> >
> > > Thanks for your Reply...
> > >
> > > But what is the benefits of different memstore for different CF, when
> all
> > > of them are going to flush on the same time?
> > >
> > >
> > > On Tue, Feb 25, 2014 at 1:23 AM, Jean-Marc Spaggiari <
> > > jean-marc@spaggiari.org> wrote:
> > >
> > > > 1. correct.
> > > > 2. Regions doesn't have memstores. Regions servers have memstores. On
> > per
> > > > region per CF. all the memstores for a single regions are flush at
> the
> > > same
> > > > time when one is full, even if the others are not.
> > > >
> > > > HTH.
> > > >
> > > > JM
> > > >
> > > >
> > > > 2014-02-24 14:35 GMT-05:00 Upendra Yadav <upendra1024@gmail.com>:
> > > >
> > > > > 1. One region server can have more than one region for same table
> > > > >
> > > > > 2. Which one is correct:
> > > > >
> > > > > a) Each region has one memstore( and all CF for this region will
> > reside
> > > > in
> > > > > this single
> > > > > memstore) and if memstore size reached its configured limit it will
> > > > > snapshot and flush... due to single CF all CF have to flush.
> > > > >
> > > > > b) Each region has n no. of CF and each CF has its own memstore.
> And
> > > when
> > > > > one CF's memstore get full it will snapshot and flush. And will not
> > > force
> > > > > to flush other CF.
> > > > >
> > > > > I read the current document some days before and now once again i
> got
> > > > that
> > > > > doubts...
> > > > >
> > > >
> > >
> >
>



-- 
Bharath Vissapragada
<http://www.cloudera.com>

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