good morning;
On 2010-08-07, at 02:45 , Jonathan Ellis wrote:
Everything in the same key of a batch_mutate is atomic. (But not
isolated.)
what does the distinction mean in the context of cassandra?
is it that the execution of an operation with the same key could see
the effect of the 'first' mutation on one column family but not
another, or that they could see the presence/absence of some columns
in a row, but not others, or?
would it be possible to illustrate the difference with some simple
examples.
On Fri, Aug 6, 2010 at 2:15 PM, B. Todd Burruss <bburr...@real.com>
wrote:
ok i just saw the FAQ
(http://wiki.apache.org/cassandra/FAQ#batch_mutate_atomic)
follow up question ...
it states that "As a special case, mutations against a single key are
atomic, but more generally no" ... i interpret that to also mean " ..
mutations against a single key in the same CF ... "
so if i have several mutatations against a single key, but multiple
column families i assume this is not atomic?
thx
On Fri, 2010-08-06 at 11:08 -0700, Todd Burruss wrote:
if i am using batch_mutate to update/insert two columns in the
same CF
and same key, is this an atomic operation?
i understand that an operation on a single key in a CF is atomic,
but
not sure if the above scenario boils down to two operations or
considered one operation.
thx
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com
