Re: Cassandra discussion channel on Slack!

Just as a heads-up, #cassandra in freenode IRC is pretty active. You might have more luck there > On 15 Jul 2016, at 08:11, denish patel wrote: > > Hello, > > I have started Slack channel to discuss Cassandra. > The purpose of this channel to use existing slack platform to get connected >

Re: Is it possible to achieve "sticky" request routing?

Many C* versions back I did this by writing a custom snitch. This was to maximise use of the row cache but had the effect of pinning requests for a key to a given server. It sounds like you want to do the same thing but ignoring the key. In more modern reversions I believe this may be done as a

Re: Unavalible Exception

We're going to need *way* more information than this On 03 Feb 2011, at 20:03, ruslan usifov wrote: > Hello > > Why i can get Unavalible Exception on live cluster (all nodes is up and never > shutdown) > > PS: v 0.7.0

Keys must be written in ascending order

I'm upgrading an 0.6 cluster to 0.7 in a testing environment. In cleaning up one of the nodes I get the exception below. Googling around seems to reveal people having trouble with it caused by too-small heap sizes but that doesn't look to be what's going on here. Am I missing something obvious?

Moving a CF from one KS to another

I'd like to move a CF from one keyspace into another. I'm running 0.6.8. Is this just a matter of draining the nodes, taking down the cluster, updating the schema in storage-conf.xml, and moving the files themselves? Is there an even niftier trick that I can without taking down the cluster? For

Re: Effective cache size

>> So with the row cache, that first node (the primary replica) is the one that >> has that row cached, yes? > No, it's the closest node as determined by snitch.sortByProximity. And with the default snitch, rack-unaware placement, random partitioner, and all nodes up, that's the primary replica,

Re: Cassandra in the cloud

> We want to try out Cassandra in the cloud. Any recommendations? Comments? > Should we use Amazon? Rackspace? Something else? I'm using it on Amazon with mostly success. I'd recommend increasing Phi from 8 to 10, use the 4-core/15gb instances to start, and if you plan to be really heavy on rea

Effective cache size

If I go to fetch some row given the rack-unaware placement strategy, the default snitch and CL==ONE, the node that is asked is the first node in the ring with the datum that is currently up, then a checksum is sent to the replicas to trigger read repair as appropriate. So with the row cache, tha

Re: Not able to install cassandra in linux

> [r...@calculus apache-cassandra-0.6.1]# bin/cassandra -f > Can't start up: not enough memory My guess is that you don't have enough memory

Maintaining secondary indices on mutable columns

I'm having trouble visualising how to maintain a secondary index on a mutable column. For instance, given some objects and the number that we have in inventory: widget1: { count = 0, colour = blue } widget2: { count = 5, colour = red } widget3: { count = 8, colour = green } widget4: { count = 8,

Proxy instances?

Is it possible to have Cassandra instances that serve only as proxies to the rest of the cluster, but have no storage themselves? Maybe with a keyspace length of 0?