cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Rob Coli <>
Subject Re: Gossip yoyo under write load
Date Mon, 15 Nov 2010 19:34:39 GMT
On 11/13/10 11:59 AM, Reverend Chip wrote:
>Swapping could conceivably be a
> factor; the JVM is 32G out of 72G, but the machine is 2.5G into swap
> anyway.  I'm going to disable swap and see if the gossip issues resolve.

Are you using JNA/memlock to prevent the JVM's heap from being swapped?

There's a log message about it at startup time if it fails, which looks 
like :

logger_.warn("Unable to lock JVM memory (ENOMEM)."
logger.warn("Unknown mlockall error " + errno(e));

Trunk also logs if it is successful :
""JNA mlockall successful");

See here for background :


View raw message