Help regarding cassandra

Hi All I was done with installing cassandra and inserting some data into Keyspace My Problem is with insertion and deletion in distributed environment and also maintaining replicas. My Requirement is I had some data stored on keySpace1 of System A I want to create the replica of the keySpace1

Re: Help regarding cassandra

Cassandra supports clusters spanning multiple data centers (see RackAwareStrategy and contrib/property_snitch), but not replication between distinct clusters. On Wed, Jan 27, 2010 at 9:36 AM, Mehar Chaitanya meharchaita...@gmail.com wrote: Hi All I was done with installing cassandra and

cassandra : How to handle joins

Hi Jonathan Thanks for ur reply I was wrong in my last posting asking about replication of changes. I want know actually how the cassandra works on distributed environment. How can we migrate mysql to cassandra From last 3 days i was searching couple of blogs archives about cassandra and

Re: Hint storage format.

On Wed, Jan 27, 2010 at 10:03 AM, Gary Dusbabek gdusba...@gmail.com wrote: The context of this discussion comes from CASSANDRA-293. Since it relies on keys, current hinted handoff scheme isn't going to work for when a range-remove operation needs to be hinted for a downed node. The idea I'm

thinking about dropping hinted handoff

While being able to write (with CL.ZERO or new-in-0.6 ANY) even if all the real write targets are down is cool, but since your goal in real life is to keep enough replicas alive that you can actually do reads, I'm not sure how useful it is. HH also has a measurable performance problem in small

Re: cassandra : How to handle joins

Have you read http://arin.me/code/wtf-is-a-supercolumn-cassandra-data-model ? On Wed, Jan 27, 2010 at 10:29 AM, Mehar Chaitanya meharchaita...@gmail.com wrote: Hi Jonathan Thanks for ur reply I was wrong in my last posting asking about replication of changes. I want know actually how the

Google SoC

Folks, As many of you might have seen, the Google SoC 2010 is approaching[1]. Would it be a good idea to start collecting a few ideas and explore SoC possibilities ? k/ [1] http://groups.google.com/group/google-summer-of-code-discuss/browse_thread/thread/d839c0b02ac15b3f

Re: Google SoC

I hadn't thought about that, but it's a great idea. I imagine the ASF will be a qualified organization once again with no further work necessary on our part in that area, so all we'd need to do would be come up with projects of appropriate scope. Any ideas there? On Wed, Jan 27, 2010 at 10:51

Re: thinking about dropping hinted handoff

On Wed, Jan 27, 2010 at 8:34 AM, Jonathan Ellis jbel...@gmail.com wrote: While being able to write (with CL.ZERO or new-in-0.6 ANY) even if all the real write targets are down is cool, but since your goal in real life is to keep enough replicas alive that you can actually do reads, I'm not

Re: thinking about dropping hinted handoff

On Wed, Jan 27, 2010 at 1:12 PM, Ryan King r...@twitter.com wrote: On Wed, Jan 27, 2010 at 8:34 AM, Jonathan Ellis jbel...@gmail.com wrote: While being able to write (with CL.ZERO or new-in-0.6 ANY) even if all the real write targets are down is cool, but since your goal in real life is to

Re: thinking about dropping hinted handoff

The HH code currently tries to send the hints to nodes other than the natural endpoints. If small-scale performance is a problem, we could make the natural endpoints be responsible for the hints. This reduces durability a bit, but might be a decent tradeoff. The other interesting benefit is

Re: thinking about dropping hinted handoff

On Wed, Jan 27, 2010 at 11:49 AM, Jonathan Ellis jbel...@gmail.com wrote: On Wed, Jan 27, 2010 at 1:48 PM, Stu Hood stu.h...@rackspace.com wrote: The HH code currently tries to send the hints to nodes other than the natural endpoints. If small-scale performance is a problem, we could make the