Re: Locking

2011-08-02 Thread Jeffrey Kesselman
jon gave a much better and more detailed description, but fundamentally no true lock is possible without an atomic test and set operation. So far, of all the No Sql DBs I've looked at, only Mongo has that capability. On Sun, Jul 31, 2011 at 4:55 PM, Soren Hansen wrote: > I've seen a couple o

Two questions about pre/post update hooks

2011-07-08 Thread Jeffrey Kesselman
(1) AIUI a given key/value data pair is "owned" by a given node at one time and operations on it happen on that node and are then replicated out. Is this correct? (2) Is the key/value pair "locked" between pre update and post update? The motivation for this question is this. I need to do the fo

Two question in re pre/post commit hooks

2011-07-08 Thread Jeffrey Kesselman
(1) AIUI a given key/value data pair is "owned" by a given node at one time and operations on it happen on that node and are then replicated out. Is this correct? (2) Is the key/value pair "locked" between pre update and post update? The motivation for this question is this. I need to do the fo

Trouble running under OpenSolaris

2011-04-23 Thread Jeffrey Kesselman
I downloaded the latest pre-built riak for OpenSolaris and installed it on the latest OpenSolaris release. When I run bin/riak start I get the following errors: riak@opensolaris:~$ bin/riak start WARNING: ulimit -n is 256; 1024 is the recommended minimum. bin/riak: line 71: /opt/ri

Wrapping my thinking around vector clocks

2011-04-21 Thread Jeffrey Kesselman
Hi Guys, I've been studying Riak and am considering a major technology base shift in a project I've been working on for more then a decade (the Project Darkstar/RedDwarf game server.) As may coming to this from a strict RDBMS background I am sure, I am trying to wrap my head around vector clocks