Hello,
I have been working on the implementation of compare-and-swap (cas) at
the client level on top of Cassandra. The result of my work is available
on https://github.com/otrack/PSSOLib. It is a small python library which
contains a few atomic concurrent objects, including cas, and which uses
an
racing against each other, we know
only one of them will win and the client who issued that write can be sure
about it.
How does the above scheme sound?
-Rishi
From: Mike Malone
To: dev@cassandra.apache.org
Sent: Tue, June 22, 2010 9:27:44 PM
Subject: Re: Atomi
On Wed, Jun 23, 2010 at 4:51 AM, aaron morton wrote:
> I've been playing with something like CAS, it's not the same but it may be
> of interest.
>
> I write some data into Cassandra with quorum or better consistency, that
> allows me to assert what it should look like when read back. If the
> asse
at sounds great. I am definitely going to look into this and
report
back if I have a good solution.
Thanks,
Rishi
From: Sylvain Lebresne
To: dev@cassandra.apache.org
Sent: Tue, June 22, 2010 1:21:51 AM
Subject: Re: Atomic Compare and Swap
On Mon, Jun 21, 2
said, if you have a neat solution for efficient and
> distributed
> >atomic CAS that doesn't require rewriting 80% of Cassandra, I'm sure there
> >will be interest in that.
>
>
> R: That sounds great. I am definitely going to look into this and report
> back
hat.
R: That sounds great. I am definitely going to look into this and report back
if I have a good solution.
Thanks,
Rishi
From: Sylvain Lebresne
To: dev@cassandra.apache.org
Sent: Tue, June 22, 2010 1:21:51 AM
Subject: Re: Atomic Compare and Swap
On Mo
On Mon, Jun 21, 2010 at 11:19 PM, Rishi Bhardwaj wrote:
> I have read the post on cages and it is definitely very interesting. But
> cages seems to be too coarse grained compared to an Atomic Compare and Swap
> on Cassandra column value. Cages would makes sense when one wants to do
&
I have read the post on cages and it is definitely very interesting. But cages
seems to be too coarse grained compared to an Atomic Compare and Swap on
Cassandra column value. Cages would makes sense when one wants to do multiple
atomic row, column updates. Also, I am not so sure about the
t: Sun, June 20, 2010 9:47:37 PM
> Subject: Re: Atomic Compare and Swap
>
>
> I too am interested in a CAS facility.
>
> I like Rishi's proposal. One could simply use a version number as the
> logical timestamp. If we promote CAS to a consistency level, it would rate
> hig
Srinivasan
To: dev@cassandra.apache.org
Sent: Sun, June 20, 2010 9:47:37 PM
Subject: Re: Atomic Compare and Swap
I too am interested in a CAS facility.
I like Rishi's proposal. One could simply use a version number as the logical
timestamp. If we promote CAS to a consistency level, it would
I too am interested in a CAS facility.
I like Rishi's proposal. One could simply use a version number as the
logical timestamp. If we promote CAS to a consistency level, it would
rate higher than a quorum. One pays the price for a more complex write
path to obtain the requisite guarantee.
Hi David
You are right that the write path for atomic compare and swap would become as
slow as the read path but that would be for compare and swap operation only. In
general the writes can remain fast and need not be changed in any way. I mean
we don't have to slow down writes, onl
-To: dev@cassandra.apache.org
Subject: Atomic Compare and Swap
Hi
I was wondering if Cassandra has any plans for supporting atomic compare and
swap operation on a column value? Compare could be on timestamp for the column
or the column value itself and the write of course is on the column value
Hi
I was wondering if Cassandra has any plans for supporting atomic compare and
swap operation on a column value? Compare could be on timestamp for the column
or the column value itself and the write of course is on the column value + a
new timestamp. If there are no plans on supporting such
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