Re: Batch mutation streaming

2012-12-09 Thread aaron morton
> (and if the message is being decoded on the server site as a complete > message, then presumably the same resident memory consumption applies there > too). Yerp. And every row mutation in your batch becomes a task in the Mutation thread pool. If one replica gets 500 row mutations from one cli

Re: JDBC, Pools and clusters ?

2012-12-09 Thread aaron morton
If you are feeling adventurous this has connection pooling, it will only work with 1.2 though https://github.com/datastax/java-driver I'm not aware of the current best practice for connecting pooling with the older JDBC driver. I can see some support for pooling in the trunk but it does not app

Re: Virtual Nodes, lots of physical nodes and potentially increasing outage count?

2012-12-09 Thread Tyler Hobbs
Nicolas, Strictly speaking, your math makes the assumption that the failure of different nodes are probabilistically independent events. This is, of course, not a accurate assumption for real world conditions. Nodes share racks, networking equipment, power, availability zones, data centers, etc.

JDBC, Pools and clusters ?

2012-12-09 Thread Andy Cobley
I'm starting to move to JBC for Cassandra (away from Hector).In his strange loop 2012 anti-pattern presentation, Mathew Dennis writes: "Sometimes people try to restrict clients to a single node. This actually takes work, and causes problems. Don’t do it." Now, I note that the JDBC pooled co

Re: server time sych

2012-12-09 Thread Martin Koch
The de-facto standard is NTP . /Martin Koch - Senior Systems Architect - Issuu On Sun, Dec 9, 2012 at 2:36 PM, S Ahmed wrote: > Hi all, > > What do you guys suggest one uses to make sure the server time on all the > servers are correct and in synch? >