On Sat, Mar 13, 2010 at 1:46 AM, Jonathan Ellis wrote:
> I'd probably go with "virtualbox images" as being simpler for people
> who don't have an AWS key already. (VB can read vmware player images,
> i think. But there is no free vmware for OS X, so you'd want to check
> that before going w/ vmw
On 2010-03-15 00:57, Toby DiPasquale wrote:
> I'm actually just trying to build a little URL shortener to use as a
> demo for an upcoming presentation I'm doing on Cassandra. The counter
> is to be used as the short key for a new URL submitted to the system:
> increment the counter and then use the
On Sun, Mar 14, 2010 at 7:47 PM, David Strauss wrote:
> On 2010-03-14 16:46, Toby DiPasquale wrote:
>> My question would be: assuming we're using both quorum reads and
>> writes, is it possible that clients A and B could race in the
>> following manner:
>>
>> * A updates its counter
>> * B updates
On 2010-03-14 16:46, Toby DiPasquale wrote:
> My question would be: assuming we're using both quorum reads and
> writes, is it possible that clients A and B could race in the
> following manner:
>
> * A updates its counter
> * B updates its counter
> * A reads the keys to get sum X
> * B reads the
Whether or not it can be made to work, it seems a poor fit for
Cassandra. Why not use Zookeeper?
On Sun, Mar 14, 2010 at 9:46 AM, Toby DiPasquale wrote:
> Hi all,
>
> I'm trying to write an application using Cassandra which requires the
> use of a global, monotonically-increasing counter. I've s
On Sun, Mar 14, 2010 at 6:37 PM, Dwight Merriman wrote:
> yes - take a look at this app engine blog post:
>
> http://googleappengine.blogspot.com/2009/09/migration-to-better-datastore.html
>
> if i read this correctly, app engine data store is pretty much in the
> "strongly consistent" camp while
yes - take a look at this app engine blog post:
http://googleappengine.blogspot.com/2009/09/migration-to-better-datastore.html
if i read this correctly, app engine data store is pretty much in the
"strongly consistent" camp while cassandra is more eventually consistent --
so really quite differen
Hey Toby,
I'm not an expert on Cassandra's infrastructure, but I believe the
thing the AppEngine datastore has that Cassandra doesn't is a
transaction between the read and write of a sharded counter. That
means that while the read of the various counters may be inconsistent,
the actual update of t
I have a writeup just for that from a while ago
http://prettyprint.me/2010/02/14/running-cassandra-as-an-embedded-service/
This addresses version 0.5.0, not 0.6 but I believe the diff isn't that big.
And as mentioned, you may also browse hector to get the list of
dependencies. Please also see
http:
Thanks Tom; I am working with 0.6 beta2 now, so not immediately applicable,
but this is helpful.
Maybe we ought to consider taking what you've done and putting it up in a
generic way accessible on a public repo.
R
On Sun, Mar 14, 2010 at 2:16 PM, Tom Chen wrote:
> Hi Ryan,
>
> I have been runn
Sure, I'll create a bug for it on github. But basically if you get a client
from a pool of servers with one server (["localhost:9160"]) and make a
request, then restart cassandra, then make another, it fails for me. Let me
do a bit more testing then I'll file a bug with details.
On Sat, Mar 13, 20
Here is an util class from the Akka test suite, embedding Cassandra:
import org.apache.cassandra.service.CassandraDaemon
object EmbeddedCassandraService {
System.setProperty("storage-config", "src/test/resources");
val cassandra = new Runnable {
val cassandraDaemon = new CassandraDaemon
Hi Ryan,
I have been running some tests locally, and I've been using.
http://github.com/rantav/hector
If you look at the pom.xml you can get a pretty good idea of the
dependencies required to run a cassandra client for version 5. I usually
combine it with the maven one jar to create one jar file
I know people have been successful embedding Cassandra, and I've seen code
for how to bootstrap it, but I'm wondering what people have done to manage
its 3rd party dependencies at build time? Especially for Maven projects,
Cassandra is highly uncooperative as a dependency, as many of its 3rd party
Hi all,
I'm trying to write an application using Cassandra which requires the
use of a global, monotonically-increasing counter. I've seen the
previous threads on this subject which basically say that this can't
be done in Cassandra as is, but I think I've come up with a method
that might work. I
+1, I'd like to try this patch but am running into error: patch failed:
src/java/org/apache/cassandra/utils/FBUtilities.java:342
Alternatively, someone could create a github fork which incorporates this
patch?
Ryan
On Sat, Mar 13, 2010 at 3:36 PM, Jonathan Ellis wrote:
> since they are separat
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