I'm currently trying to wrap my head around Cassandra which is definitely not
easy for a mind deeply entrenched in SQL :)
I see how blogs/tweets etc. can be modeled in Cassandra. However, I have a
sightly different problem.
Let's say we let the user see a random item(article/picture/recipe/you-
See CASSANDRA-293 and CASSANDRA-494.
Key-range updates touch multiple rows and cannot be performed
atomically, so the consistency promise you get would be the same as
with batch_mutate. Another other problem is that the update needs to
be sent to *any* node that is responsible for part of the ran
I'm currently using apache archiva instance as a private caching maven
repository. I've manually added the nonpublic artifacts to the cache which
makes life a great deal simpler. See http://archiva.apache.org/
Regards,
--Jools
On 24 June 2010 07:36, Ran Tavory wrote:
> Hector has a pom.xml wh
Here's what we have for hector:
wiki: http://wiki.github.com/rantav/hector/
blog posts: http://prettyprint.me/2010/02/23/hector-a-java-cassandra-client/
http://prettyprint.me/2010/03/03/load-balancing-and-improved-failover-in-hector/
http://prettyprint.me/2010/04/03/jmx-in-hector/
Examples:
Exa
Thanks Ran,
I downloaded those,
ReadAllKeys worked straight up, very good example, I have already got
ExampleClient working so ditto there :-)
I am searching for the defintion of Command in ExampleDAO
getallkey slices and keyspace test have a few more unresolved externals like
junit, mockito and ot
Thanks for this effort Gavan :)
On Thu, Jun 24, 2010 at 3:47 PM, Gavan Hood wrote:
> Thanks Ran,
> I downloaded those,
> ReadAllKeys worked straight up, very good example, I have already got
> ExampleClient working so ditto there :-)
> I am searching for the defintion of Command in ExampleDAO
>
ya, until the developers decide to go the route of most other apache
projects and use maven and deploy artifacts into maven central your
best bet is to manage it yourself and install into a repository
manager and like archiva and nexus
then you can reference things as normal, just a minor bit of m
About the most popular item, you could probably store the k most popular
items in a ColumnFamily with appropriate columns, and every time someone
casts a vote, check whether they need updating/replacement.
Alexander
> I'm currently trying to wrap my head around Cassandra which is definitely
> not
fwiw we use nexus and it's quite nice. But ya - that doesn't solve your
problem, sorry...
I can only offer the ant build script from hector... (or the mvn script
which works well if you download all dependencies locally)
On Thu, Jun 24, 2010 at 4:49 PM, Jesse McConnell
wrote:
> ya, until the deve
Hi
What kind of Map Reduce support is provided for Cassandra ?
Can i get some columns from different rows and then aggregate them up
together. Its basically aggregation of statistics for various devices
connected to a network manager. Is it a right kind of use case to be
supported by MR ?
Thank
Indeed. So simple it didn't even cross my mind :) Thank you!
On Thu, Jun 24, 2010 at 5:00 PM, wrote:
> About the most popular item, you could probably store the k most popular
> items in a ColumnFamily with appropriate columns, and every time someone
> casts a vote, check whether they need updat
Jesse McConnell writes:
> ya, until the developers decide to go the route of most other apache
> projects and use maven and deploy artifacts into maven central your
> best bet is to manage it yourself and install into a repository
> manager and like archiva and nexus
the issue is a bit worse. t
On Wed, Jun 23, 2010 at 12:18 AM, David Boxenhorn wrote:
> Tatu, I did read your comments - and I appreciate them very much!
>
> I want someone to argue with me (using good arguments) since what I'm doing
> *does* seem weird to me - because no one else is doing it.
>
> What I mean by readable is t
the main idea is "denormalize your data into multiple CFs at write
time so that each CF lets you answer a query from a single row."
http://www.rackspacecloud.com/blog/2010/05/12/cassandra-by-example/ is
a good place to start.
On Tue, Jun 22, 2010 at 3:43 PM, Craig Faulkner
wrote:
> I'm having a
getting a TimedOutException for a few requests when a machine fails
before Cassandra's Failure Detector notices is normal.
On Wed, Jun 23, 2010 at 12:34 PM, Wouter de Bie
wrote:
> Hi,
>
> I've currently setup a cluster of 11 nodes. When running a small application
> that uses Hector to read and
apparently the git mirror is so far behind that it doesn't know that
cassandra_browser was removed for lack of maintenance weeks ago.
On Wed, Jun 23, 2010 at 2:26 PM, Eben Hewitt wrote:
> The python cassandra_browser is not in the contrib directory if I clone from
> git, but it is present if I ch
Glad you tracked that down!
On Wed, Jun 23, 2010 at 6:14 PM, AJ Slater wrote:
> This issue is caused by my network.
>
> Cassandra maintains multiple gossip connections per node pair. One of
> these connections is used for heartbeat and load broadcasting traffic.
> Its quite talky. Another one is
Right, I think there must be some other factor here because neither
the flush nor discard of obsolete commitlog segments block writes.
On Wed, Jun 23, 2010 at 7:05 PM, Sean Bridges wrote:
> I see about 3000 lines of,
>
> INFO [COMMIT-LOG-WRITER] 2010-06-23 16:40:29,107 CommitLog.java (line
> 412)
does http://wiki.apache.org/cassandra/HadoopSupport help?
On Thu, Jun 24, 2010 at 11:01 AM, Atul Gosain wrote:
> Hi
> What kind of Map Reduce support is provided for Cassandra ?
> Can i get some columns from different rows and then aggregate them up
> together. Its basically aggregation of stat
if not? I assume upgrading from .6.2 from .6.1 is just updating the server
binary?
thanks,
Claire
Yes
On Thu, Jun 24, 2010 at 10:33 PM, Claire Chang
wrote:
> if not? I assume upgrading from .6.2 from .6.1 is just updating the server
> binary?
>
> thanks,
> Claire
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://
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