Problems with cache.clear()

Hello!
We are having some problems with cache clears in our production cluster that we do once a day. Sometimes heaps "explode" with a lot of outgoing messages when we do a cache.clear() and the entire cluster starts failing.
We had some success with a alternate method of doing the cache clear where we iterate cache.keySet() and do a cache.remove(key) with a pausetime of 100 ms after 20000 objects until the cache is empty. But today nodes started failing on a cache.size() before the removes started (the first thing we do is to log the size of the cache we are about to clear before the remove operations start).
We have multiple distributed caches configured with a near cache. The nearcache has 10k objects as high units and the back caches vary in size, the largest is around 300k / node.
In total the DistributedCache-service is handling ~20 caches.
The cluster consists of 18 storage enabled nodes spread across 6 servers and 31 non storage enabled nodes running on 31 servers.
The invalidation stategy on the near caches is ALL (or, its AUTO but it looks like it selects ALL since ListenerFilterCount=29 and ListenerKeyCount=0 on a StorageManager?)
Parition count is 257, backup count 1, no changes in thread count on the service, service is DistributedCache.
Coherence version 3.6.1.0.
A udp test sending from one node to another displays 60 megabyte/s.
Heapsize for the Coherence JVMs, 3gb. LargePages is used.
Heapsize for the front nodes JVMs, 6gb. LargePages is used.
No long GC-times (until the heaps explode), 0.2-0.6 seconds. CMS-collector.
JDK 1.6 u21 64-bit.
Windows 2k8R2.
We are also running CoherenceWeb and some Read/Write-caches, but on different coherence services. We are not doing any clear/size-operations against caches owed by these services.
Looking at some metrics from the last time we had this problem (where we crashed on cache.size()).
The number of messages sent by the backing nodes went from <100/s to 20k-50k/s in 15 s.
The number of messages resent by the backing nodes went from ~0/s to 1k-50k/s depending on the node in 15 s.
At the time the total number of requests against the DistributedCache-service was around 6-8/s and node.
To my questions, should it be a problem to do a cache clear with this setup (where the largest cache is around 5.4 million entires) ? Should it be a problem to do a cache.size()?
What is the nicest way to do a cache.clear()? Any other strategy?
Could a lock on a entry in the cache cause this problem? Should it really cause a problem with cache.size()?
Any advice?
BR,
Carl
Edited by: carl_abramsson on 2011-nov-14 06:16

Hi Charlie,
Thank you for your answer! Yes, actually we are using a lot of expiry and many of the items are created at roughly the same time! We haven't configured expiry in the cache configuration, instead we do a put with a expire.
Regarding the workload, compared to our peak hours it has been very low when had problems with the size and clear operations. So the backing tier isn't really doing much at the time. That's what has been so strange with this problem.
The release going live today has PRESENT as near cache invalidation strategy. We remove as much of the expire as possible in the next.
BR,
Carl

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"ape54321" <[email protected]> wrote in
message
news:[email protected]...
> I am in the process of building a template for my
website. I have built
my
> Spry menu bar and have designated a div for to become my
"editable area."
This
> area to become the editable area is a DIV called "main
content." It
placed
> directly following the Spry menu bar. I have set a CSS
rule for the "main
> content" div as: BOX = Float: left and Clear: both.
>
> Why is the content (text) for the "main content" div
still jumping up
along
> side my spry menu bar?
>
> See the page...
>
http://www.birchwoodstudios.net/luke/bsweb/Birchwoodstudios.html
>
> Thanks so much in advance!
> Luke
>

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