Eventual consistency in Hbase

[Vimal Jain <vk...@gmail.com>]

Hi,
I heard that Hbase provides eventual consistency.
What does that mean ?
Where can i get more information on different consistency model and how
hbase achieves eventual consistency ?

-- 
Thanks and Regards,
Vimal Jain

Re: Eventual consistency in Hbase

[Nick Dimiduk <nd...@gmail.com>]

Consistency between replicated clusters (across data centers) is
asynchronous and can also be considered "eventual". From within a single
cluster, only a single node is responsible for serving a given range of
data, so there is only one, consistent, view on that data. This model can
be relaxed via configuration with the introduction of HBASE-10070.

On Friday, March 14, 2014, lars hofhansl <la...@apache.org> wrote:

> Might be best to look up the "CAP theorem". In that terms HBase is a CP
> store (consistent and partition tolerant).
> HBase will probably provide some eventual consistency soon via HBASE-10070.
>
>
> -- Lars
>
>
>
> ________________________________
>  From: Vimal Jain <vkjk89@gmail.com <javascript:;>>
> To: "user@hbase.apache.org <javascript:;>" <user@hbase.apache.org<javascript:;>
> >
> Sent: Friday, March 14, 2014 12:02 AM
> Subject: Re: Eventual consistency in Hbase
>
>
> You mean Hbase is not an "eventual consistent" ?
> Then what kind of consistency it provides ?
> Where can i get more information about different consistency models ?
>
>
> On Fri, Mar 14, 2014 at 12:26 PM, Salabhanjika S <salabhanjika9@gmail.com<javascript:;>
> >wrote:
>
> > https://hbase.apache.org/book/architecture.html
> >
> > "Strongly consistent reads/writes: HBase is not an "eventually
> > consistent" DataStore. This makes it very suitable for tasks such as
> > high-speed counter aggregation."
> >
> > On Fri, Mar 14, 2014 at 12:21 PM, Vimal Jain <vkjk89@gmail.com<javascript:;>>
> wrote:
> > > Hi,
> > > I heard that Hbase provides eventual consistency.
> > > What does that mean ?
> > > Where can i get more information on different consistency model and how
> > > hbase achieves eventual consistency ?
> > >
> > > --
> > > Thanks and Regards,
> > > Vimal Jain
> >
>
>
>
> --
> Thanks and Regards,
> Vimal Jain

Re: Eventual consistency in Hbase

[lars hofhansl <la...@apache.org>]

Might be best to look up the "CAP theorem". In that terms HBase is a CP store (consistent and partition tolerant).
HBase will probably provide some eventual consistency soon via HBASE-10070.


-- Lars



________________________________
 From: Vimal Jain <vk...@gmail.com>
To: "user@hbase.apache.org" <us...@hbase.apache.org> 
Sent: Friday, March 14, 2014 12:02 AM
Subject: Re: Eventual consistency in Hbase
 

You mean Hbase is not an "eventual consistent" ?
Then what kind of consistency it provides ?
Where can i get more information about different consistency models ?


On Fri, Mar 14, 2014 at 12:26 PM, Salabhanjika S <sa...@gmail.com>wrote:

> https://hbase.apache.org/book/architecture.html
>
> "Strongly consistent reads/writes: HBase is not an "eventually
> consistent" DataStore. This makes it very suitable for tasks such as
> high-speed counter aggregation."
>
> On Fri, Mar 14, 2014 at 12:21 PM, Vimal Jain <vk...@gmail.com> wrote:
> > Hi,
> > I heard that Hbase provides eventual consistency.
> > What does that mean ?
> > Where can i get more information on different consistency model and how
> > hbase achieves eventual consistency ?
> >
> > --
> > Thanks and Regards,
> > Vimal Jain
>



-- 
Thanks and Regards,
Vimal Jain

Re: Eventual consistency in Hbase

[Vimal Jain <vk...@gmail.com>]

You mean Hbase is not an "eventual consistent" ?
Then what kind of consistency it provides ?
Where can i get more information about different consistency models ?


On Fri, Mar 14, 2014 at 12:26 PM, Salabhanjika S <sa...@gmail.com>wrote:

> https://hbase.apache.org/book/architecture.html
>
> "Strongly consistent reads/writes: HBase is not an "eventually
> consistent" DataStore. This makes it very suitable for tasks such as
> high-speed counter aggregation."
>
> On Fri, Mar 14, 2014 at 12:21 PM, Vimal Jain <vk...@gmail.com> wrote:
> > Hi,
> > I heard that Hbase provides eventual consistency.
> > What does that mean ?
> > Where can i get more information on different consistency model and how
> > hbase achieves eventual consistency ?
> >
> > --
> > Thanks and Regards,
> > Vimal Jain
>



-- 
Thanks and Regards,
Vimal Jain

Re: Eventual consistency in Hbase

[Salabhanjika S <sa...@gmail.com>]

https://hbase.apache.org/book/architecture.html

"Strongly consistent reads/writes: HBase is not an "eventually
consistent" DataStore. This makes it very suitable for tasks such as
high-speed counter aggregation."

On Fri, Mar 14, 2014 at 12:21 PM, Vimal Jain <vk...@gmail.com> wrote:
> Hi,
> I heard that Hbase provides eventual consistency.
> What does that mean ?
> Where can i get more information on different consistency model and how
> hbase achieves eventual consistency ?
>
> --
> Thanks and Regards,
> Vimal Jain

Re: Eventual consistency in Hbase

[Bharath Vissapragada <bh...@cloudera.com>]

Not sure where you heard it, but thats wrong. HBase provides strong
consistency at the row-level. Read about CAP theorem and also there is so
much literature available on various consistency models and how they affect
your application. Google key words (consistency models in databases, CAP
theorem, paxos and related stuff)


On Fri, Mar 14, 2014 at 12:21 PM, Vimal Jain <vk...@gmail.com> wrote:

> Hi,
> I heard that Hbase provides eventual consistency.
> What does that mean ?
> Where can i get more information on different consistency model and how
> hbase achieves eventual consistency ?
>
> --
> Thanks and Regards,
> Vimal Jain
>



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