I'm actually using Curator as a Zookeeper client myself. I haven't used it
in production yet, but so far it seems well written and Jordan Zimmerman at
Netflix has been great on the support end as well.
I haven't tried Cages so I can't really compare, but I think one of the
main deciding factors b
I am not sure if this is the right thread to ask about this.
I read that some people are using cage+zookeeper. I was wondering if anyone
evaluates https://github.com/Netflix/curator? this seems to be a versatile
package.
On Tue, Dec 13, 2011 at 6:06 AM, John Laban wrote:
> Ok, great. I'll be s
Ok, great. I'll be sure to look into the virtualization-specific NTP
guides.
Another benefit of using Cassandra over Zookeeper for locking is that you
don't have to worry about losing your connection to Zookeeper (and with it
your locks) while hammering away at data in Cassandra. If using Cassan
Hey Jake,
So I guess my problem is that I've never really relied on NTP before to try
to guarantee consistency in my application. Does it tend to work really
well in practice? What's the maximum clock skew you can see even when
running NTP (especially if you're using more than one DC where you m
Hi John,
On 12 December 2011 19:35, John Laban wrote:
>
> So I responded to your algorithm in another part of this thread (very
> interesting) but this part of the paper caught my attention:
>
> > When client application code releases a lock, that lock must not
> actually be
> > released for a pe
>
>
> Jake: The algorithm you've outlined is pretty similar to how Zookeeper
> clients implement locking. The potential only issue that I see with it
> implemented in Cassandra is that it uses the timestamps of the inserted
> columns to determine the winner of the lock. The column timestamps are
Hi Dominic,
So I responded to your algorithm in another part of this thread (very
interesting) but this part of the paper caught my attention:
> When client application code releases a lock, that lock must not actually
be
> released for a period equal to one millisecond plus twice the maximum
pos
Dominic/Jake: very interesting. This is getting more into fundamentals on
locking/isolation rather than transactions/atomicity, but it is still
relevant as I was going to use ZooKeeper for that stuff, but it would
certainly nice to KISS and remove a component from my setup if I can do
without it.
I've written a locking mechanism for Solandra (I refer to it as a
reservation system) which basically allows you to acquire a lock. This is
used to ensure a node is service unique sequential IDs for lucene.
It sounds a bit similar to Dominic's description but I'll explain how the
Solandra one wo
Hi guys, just thought I'd chip in...
Fight My Monster is still using Cages, which is working fine, but...
I'm looking at using Cassandra to replace Cages/ZooKeeper(!) There are 2
main reasons:-
1. Although a fast ZooKeeper cluster can handle a lot of load (we aren't
getting anywhere near to capa
you could try writing with the clock of the initial replay entry?
On 06/12/2011 20:26, John Laban wrote:
Ah, neat. It is similar to what was proposed in (4) above with adding
transactions to Cages, but instead of snapshotting the data to be
rolled back (the "before" data), you snapshot the dat
I dont' use exactly the same approach describe in the presentation. I use
the idea to write whole data in one time in one column value to have
atomicity.
My application make a read before write... to verify the state of the last
transactionlog. If there is data in my "transactionlog" column, it' b
Ah, neat. It is similar to what was proposed in (4) above with adding
transactions to Cages, but instead of snapshotting the data to be rolled
back (the "before" data), you snapshot the data to be replayed (the "after"
data). And then later, if you find that the transaction didn't complete,
you j
Hi John,
I had exactly the same reflexions.
I'm using zookeeper and cage to lock et isolate.
but how to rollback?
It's impossible so try replay!
the idea is explained in this presentation
http://www.slideshare.net/mattdennis/cassandra-data-modeling (starting from
slide 24)
- insert your whole
Hello,
I'm building a system using Cassandra as a datastore and I have a few
places where I am need of transactions.
I'm using ZooKeeper to provide locking when I'm in need of some concurrency
control or isolation, so that solves that half of the puzzle.
What I need now is to sometimes be able t
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