I don't think there's ever been a "memory_locking_policy" variable. Cassandra will call mlockall if JNA is present, no further steps required.
On Thu, Jul 28, 2011 at 5:17 AM, Stephen Henderson <stephen.hender...@cognitivematch.com> wrote: > Hi, > > > > We’ve started having problems with cassandra and memory swapping on linux > which seems to be a fairly common issue (in our particular case after about > a week all swap space will have been used up and we have to restart the > process). > > > > It sounds like the general consensus is to just disable swap completely, but > the recently released “Cassandra High Performance Cookbook” from Packt has > instructions for “Stopping cassandra from using swap without disabling it > system wide”. We’ve tried following the instructions but it refers to a > “memory_locking_policy” variable in cassandra.yaml which throws an “unknown > property” error on startup and I can’t find any reference to it in any of > the cassandra docs. > > > > I’ve copied the summarised instructions below, does anyone know if this is > something that ever worked or is there a different variable to set which > does the same thing? (we’re using 0.7.4 at present and it looks like the > book was written for 0.7.0-beta-1.10 so it might have been something which > was abandoned during beta?) > > --- > > Disabling Swap Memory system-wide may not always be desirable. For example, > if the system is not dedicated to running Cassandra, other processes on the > system may benefit from Swap Memory. This recipe shows how to install the > Java Native Architecture, which allows Java to lock itself in memory making > it inevitable. > > > > 1. Place the jna.jar and platform.jar in the $CASSANDRA_HOME/lib directory: > > 2. Enable memory_locking_policy in $CASSANDRA_HOME/conf/cassandra.yaml: > “memory_locking_policy: required” > > 3. Restart your Cassandra instance. > > 4. Confirm this configuration has taken effect by checking to see if a large > portion of memory is Unevictable: > > $ grep Unevictable /proc/meminfo > > Unevictable: 1024 Kb > > --- > > > > > > Thanks, > > Stephen > > > > Stephen Henderson – Lead Developer (Onsite), Cognitive Match > > stephen.hender...@cognitivematch.com | http://www.cognitivematch.com > > T: +44 (0) 203 205 0004 | F: +44 (0) 207 526 2226 > > -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
