GC listener

[Krystal Mok]

Hi Peter,

One of the ways I've seen people using GC notification in conjunction with
a load balancer is that they would set some notification threshold, and
possibly calculate the allocation rate so that it can predict how much time
there is before a full GC might occur. When a full GC is predicted to
happen soon, it would take itself off the load balancer, do a
*System.gc()*, and then attach itself back onto the load balancer.

That way they'd get the predicted full GC and actually see it "on time",
without worrying about the lack of allocations to trigger a normal full GC.

I'm not an advocate of this method, it's just one way it's been used in the
wild.

- Kris


On Fri, Mar 21, 2014 at 10:44 AM, Peter B. Kessler <
Peter.B.Kessler at oracle.com> wrote:

> If you exclude yourself from the load balancer before the collection, you
> won't get any more work, won't do any more allocations, and won't cause the
> collection.  Wouldn't it be better to tune your collector to meet your
> deadlines while getting work done?
>
>                         ... peter
>
>
> On 03/21/14 03:37, Milan Mimica wrote:
>
>> Hello
>>
>> Would it be possible for the application to register some kind of a
>> listener to track GC activity, and that way predict when Full GC is going
>> to happen?
>> My application is a service behind a load balancer, and if it could see
>> Full GC which stops the world coming, given some time to react, it could
>> exclude itself from the balancer.
>> //
>>
>> *Milan Mimica, *Software Engineer / Team Leader
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