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From Clint Kelly <clint.ke...@gmail.com>
Subject Re: Cassandra process exiting mysteriously
Date Wed, 06 Aug 2014 21:49:24 GMT
Hi Rob,

Thanks for the clarification; this is really useful.  I'll run some
experiments to see if the problem is a JVM OOM on our build machine.

Best regards,
Clint

On Wed, Aug 6, 2014 at 1:14 PM, Robert Coli <rcoli@eventbrite.com> wrote:
> On Wed, Aug 6, 2014 at 1:12 PM, Robert Coli <rcoli@eventbrite.com> wrote:
>>
>> On Wed, Aug 6, 2014 at 1:11 AM, Duncan Sands <duncan.sands@gmail.com>
>> wrote:
>>>
>>> this doesn't look like an OOM to me.  If the kernel OOM kills Cassandra
>>> then Cassandra instantly vaporizes, and there will be nothing in the
>>> Cassandra logs (you will find information about the OOM in the system logs
>>> though, eg in dmesg).  In the log snippet above you see an orderly shutdown,
>>> this is completely different to the instant OOM kill.
>>
>>
>> Not really.
>>
>> https://issues.apache.org/jira/browse/CASSANDRA-7507
>
>
> To be clear, there's two different OOMs here, I am talking about the JVM
> OOM, not system level. As CASSANDRA-7507 indicates, JVM OOM does not
> necessarily result in the cassandra process dying, and can in fact trigger
> clean shutdown.
>
> System level OOM will in fact send the equivalent of KILL, which will not
> trigger the clean shutdown hook in Cassandra.
>
> =Rob

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