Re: Right sizing Cassandra data nodes

The problem with higher densities is operations, not querying. When you need to add nodes/repair/do any streaming operation having more than 3TB per node becomes more difficult. It's certainly doable, but you'll probably run into issues. Having said that, an insert only workload is the best candida

Re: The home page of Cassandra is mobile friendly but the link to the third parties is not

Already addressed in CASSANDRA-14128 , however waiting on review/comments regarding what we actually do with this page. If you want to bring attention to JIRA's, user list is probably appropriate. I'd avoid spamming it too much though. On 26

RE: [EXTERNAL] Re: Version Rollback

My short answer is always – there are no rollbacks, we only go forward. Jeff’s answer is much more complete and technically precise. You *could* rollback a few nodes (depending on topology) by just replacing them as if they had died. I always upgrade all nodes (the binaries) as quickly as possi

Re: JMX metrics for CL

On Tue, Feb 27, 2018 at 2:26 AM, Kyrylo Lebediev wrote: > Hello! > > > Is it possible to get counters from C* side regarding CQL queries > executed since startup for each CL? > For example: > CL ONE: NNN queries > CL QUORUM: MMM queries > etc > It's possible to get a count of client requests.

Re: JMX metrics for CL

It's not a change in the source code though since it's a plugin. You simply do the following: * Implement the QueryHandler interface with new metrics. * Add the compiled jar to the CLASSPATH in cassandra.in.sh * In cassandra-env.sh, set -Dcassandra.custom_query_handler_class to your custom

Cassandra Chunk Cache hints ?

Hi everyone, I'm trying to find information on the Chunk Cache, and the "only" thing I found so far is the Jira : https://issues.apache.org/jira/browse/CASSANDRA-5863 where this functionality was added. I'm wondering if this is something to be adjusted when it's full ? Are there some rule of thum

Re: Batch too large exception

Hi, Are you writing the batch to same partition? If not, there is a much stricter limit (I think 50Kb). Check https://docs.datastax.com/en/cql/3.3/cql/cql_using/useBatch.html , and followups. From: Goutham reddy Reply-To: "user@cassandra.apache.org" Date: Tuesday, February 27, 2018 at 9:55 PM

Re: JMX metrics for CL

Thanks, Horia! Wouldn't like to introduce any changes in source code. Any alternatives how to trace CL's used from C* side? If not 'since startup', then at least online metrics will be fine. Regards, Kyrill From: Horia Mocioi Sent: Tuesday, February 27, 20

Re: Cassandra on high performance machine: virtualization vs Docker

In terms of Cassandra, rack is considered as single point of failure. So, using some rack-aware snitch (GossipingPropertyFileSnitch would be the best for your case) Cassandra won't place multiple replicas of the same range in the same rack. Basically, there are two requirements that should be

Re: Version Rollback

These are really good directions. Thanks a lot everyone! @Kenneth - The cluster is comprised of 44 nodes, version 2.0.14, ~2.5TB of data per node. It's gonna be a major version upgrade (or upgrades to be exact... version 3.x is the target). @Jeff, I have a passive DC. What if I upgrade the passiv

Re: Cassandra on high performance machine: virtualization vs Docker

Thanks Unfortunately yes! this is a production, That's the only thing i have! and I'm going to use ESX (I'm not worried about throughput overhead although stress tests shows no problem with esx some thing like throughput of cassandra on single physical server < 3 * nodes on the same server) If