You don't mention if you have threadsafe on. If so, you might be
experiencing some sort of deadlock or something with the way you are
creating your JCache on every request. I'd try moving away from JCache and
accessing the MemcacheService directly. I create a MemcacheService object
for each thread and reuse that object. I've had no problems/issues like
you've described but my QPS are probably not as much as yours. Here's some
sample code
private static ThreadLocal<MemcacheService> memcacheService =
newThreadLocal<MemcacheService>() {
protected synchronized MemcacheService initialValue() {
return MemcacheServiceFactory.getMemcacheService();
}
};
public static MemcacheService getService() {
return memcacheService.get();
}
If you try switching to MemcacheService directly, please let us know if it
helps or not.
Stephen
CortexConnect.com
On Sun, Oct 2, 2011 at 1:58 PM, Bernd F <[email protected]> wrote:
> Thank you for your input Jay, at least there is something I can cling
> to. Could you be a little bit more specific about this bad value.
>
> What could that be? Or better said: Is that anything I can control?
>
> Btw: After I set the Max Idle value to Automatic a few days ago it
> happened again (earlier today).
>
>
> On 2 Okt., 20:27, Jay Young <[email protected]> wrote:
> > It sounds like you have a bad value in memcache and when a servlet hits
> it,
> > it blocks the instance that's executing it. When you have multiple
> > instances running, other requests can be served by other instances. When
> > you set it to 1, that one faulty instance gets backed up and requests
> start
> > timing out. That's the only reason I can think of that clearing memcache
> > AND changing your # of instances would solve the problem. It's like your
> > bad memcache value is a blockage in a stream. Clearing memcache clears
> the
> > block. Increasing the number of instances allows other requests to flow
> > around the block.
>
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