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, only the compar
That is impossible to implement without making the write path at least as slow
as the read path. Things like this typically get layed on Cassandra by using an
external locking framework, like Zookeeper.
-Original Message-
From: Rishi Bhardwaj
Date: Sun, 20 Jun 2010 14:57:46
To:
Reply-
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 an
