Hi All,
Making transaction is my actual preoccupation of the moment.
My need is :
- update data in column family #1
- insert data in column family #2
My need is to see thes opérations in a single transaction because the
data is tightly coupled.
I use zookeeper/cage to make distributed lock to
On 6/22/2011 9:18 AM, Trevor Smith wrote:
Right -- that's the part that I am more interested in fleshing out in
this post.
Here is one way. Use MVCC
http://en.wikipedia.org/wiki/Multiversion_concurrency_control. A
single global clean-up process would be acceptable since it's not a
Domonic,
Thank you for your answer. I enjoy how in your day to day work you are
concerned with who has the monster. It must be a fun to read your
productions logs (User[Shelly] received vampire).
I looked into Cages and this does seem interesting. I need to do more
reading to have a better take.
AJ,
Thanks for your input. I don't fully follow though how this would work with
a bank scenario. Could you explain in more detail?
Thanks.
Trevor
On Wed, Jun 22, 2011 at 6:34 PM, AJ a...@dude.podzone.net wrote:
I think Sasha's idea is worth studying more. Here is a supporting read
Hi Dominic,
Thanks so much for providing this information. I was unaware of Cages and
this looks like it could be used effectively for certain things.
This is because Cassandra uses the timestamps of columns that have been
written during reconciliation to determine which should be persisted
On Thu, Jun 23, 2011 at 2:05 PM, Les Hazlewood l...@katasoft.com wrote:
Hi Dominic,
Thanks so much for providing this information. I was unaware of Cages and
this looks like it could be used effectively for certain things.
This is because Cassandra uses the timestamps of columns that have
Thanks for the pointer Ryan!
Regards,
Les
On 6/23/2011 7:37 AM, Trevor Smith wrote:
AJ,
Thanks for your input. I don't fully follow though how this would work
with a bank scenario. Could you explain in more detail?
Thanks.
Trevor
I don't know yet. I'll be researching that. My working procedure is to
figure out a way to handle
Hello,
I was wondering if anyone had architecture thoughts of creating a simple
bank account program that does not use transactions. I think creating an
example project like this would be a good thing to have for a lot of the
discussions that pop up about transactions and Cassandra (and
I'd implement the concept of a bank account using counters in a
counter column family. one row per account ... each column for
transaction data and one column for the actual balance.
just so long as you use whole numbers ... no one needs pennies anymore.
-sd
On Wed, Jun 22, 2011 at 4:18 PM,
Sasha,
How would you deal with a transfer between accounts in which only one half
of the operation was successfully completed?
Thank you.
Trevor
On Wed, Jun 22, 2011 at 10:23 AM, Sasha Dolgy sdo...@gmail.com wrote:
I'd implement the concept of a bank account using counters in a
counter
I would still maintain a record of the transaction ... so that I can
do analysis post to determine if/when problems occurred ...
On Wed, Jun 22, 2011 at 4:31 PM, Trevor Smith tre...@knewton.com wrote:
Sasha,
How would you deal with a transfer between accounts in which only one half
of the
Right -- that's the part that I am more interested in fleshing out in this
post.
Must one have background jobs checking the integrity of all transactions at
some time interval? This gets hairy pretty quick with bank transactions (one
unrolled transaction could cause many others to become
Hi Trevor,
I hope to post on my practical experiences in this area soon - we rely
heavily on complex serialized operations in FightMyMonster.com. Probably the
most simple serialized operation we do is updating nugget balances when, for
example, there has been a trade of monsters.
Currently we
I think Sasha's idea is worth studying more. Here is a supporting read
referenced in the O'Reilly Cassandra book that talks about alternatives
to 2-phase commit and synchronous transactions:
http://www.eaipatterns.com/ramblings/18_starbucks.html
If it can be done without locks and the
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