When the memory coherence is full, what consistency do?

Dear Expert:

I have a problem in customer, they ask:
When the memory coherence is full, what consistency do?
He takes care to write data or the entry on the disk?
If it can be supported, how can I config?

I read some documents, but I find things like this:
< local plan >
LRU <-eviction strategy > < / eviction strategy >
< high-units > 1000 < / high units >
< expiry delay > 1 h < / timeout >
< / local plan >

but I can not find somethings on the coherence jvm memory usage?

Thanks in advance.

Hello

There is no magic solution to stop short of memory coherence. A cluster of coherence is a limited resource and has a finite size and you need to do some sort of exercise as you would with something like a database capacity planning system. You wouldn't continue to put data in a database without him running out of resources, and the same is true with consistency.

Yes, there are things like expiry which allows you to limit the size of the caches, but like the previous poster said, when the limit is reached data will be evicted from memory. Unless you have some form of persistent storage for these data using something like a dumps, while the data is lost.

You can set the overflow to disk so that when a size the cache limit is reached as described here http://download.oracle.com/docs/cd/E15357_01/coh.360/e15723/cache_examples.htm#BACCHCIA

The problem with the ousting of size based and exceeded the size in function, is that the limit is per cache per JVM. This means that for a system with several caches and services that you usually end up expulsion or overflow to disk for a cache that reached its limit when there still may be a lot of memory left that you need to allow for each cache being full in your design.

I saw people in the past are trying to find different ways of ousting of data based on the used JVM heap, but they never seem to be satisfactory. If you've seen a chart of the JVM heap usage you will see that it is usually a model of Sawtooth constantly up and down. A JVM could hit 90% use but still have a lot of real space because he had not recently made a GC. If you have a schema data eveicted when the reached JVM say 90% you could start to expel the data too early. Also, it's probably enough data in a cluster push possile faster than data can be evicted if you might still run out of memory. A cluster of coherence consists of multiple JVM processes and if you get skewed the disaggregation of data or you caching of objects of different sizes, it is quite possible to get Java virtual machines in the cluster running off lot well before others. The project I'm working on that, we had a situation where we had a few nodes in the cluster using more than 300 MB of heap more than the other nodes in the cluster - is quite a big difference when the total heap was only 2.5 GB.

As I said the best thing to do is good capacity planning. Work out how much you need to organize and work on the size of your cluster based on that data. You probably still have some sort of eviction of the data well. The system on which I work at eviction of the moment according to some data and custom eviction of other data based on business rules. Custom eviction is juats another process that verifies the data and expels the relevant stuff.

Tags: Fusion Middleware

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