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Date: Mon, 15 Nov 2010 12:08:06 -0800
From: Reverend Chip <rev.chip@gmail.com>
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To: user@cassandra.apache.org
Subject: Re: Gossip yoyo under write load
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On 11/15/2010 11:34 AM, Rob Coli wrote:
> 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?

I didn't take any extra steps in that direction; though having disabled
swap, I doubt it's an issue I should worry about now.

>
> There's a log message about it at startup time if it fails, which
> looks like :
>
> "
> logger_.warn("Unable to lock JVM memory (ENOMEM)."
> or
> logger.warn("Unknown mlockall error " + errno(e));
> "
>
> Trunk also logs if it is successful :
> "
> logger.info("JNA mlockall successful");

None of those messages has appeared in either output.log or system.log.  ?

> See here for background :
>
> https://issues.apache.org/jira/browse/CASSANDRA-1214
>
> =Rob
>