Duplicate data in front scheme and back scheme?

Assume that a near cache has been defined with a front-scheme and a back-scheme. The front-scheme is a local-scheme and the back-scheme is a distributed-scheme.
Now assume that there is a piece of data for which the current JVM is a master. That is, the data resides in the back cache.
Assume that the JVM accesses that data.
Will this populate the front cache even though the master is in the back cache on the same JVM?
Does Coherence therefore store two copies of the data, one in the front cache, one in the back cache?
Or does Coherence realize that the requested data is in the back cache on the same JVM, and therefore doesn't make another copy and populate the front cache, but instead simply redirects the get call to it's own back cache?
This basically has memory implications and I'm trying to configure a cache that works on a single JVM as well as a cluster. I am trying to get away with having just the one configuration file for coherence irrespective of whether the application is on a single storage enabled node, or a cluster.
I cannot tell from the diagram in the Developer Guide at http://docs.oracle.com/cd/E24290_01/coh.371/e22837/cache_intro.htm#BABCJFHE
because I'm not sure whether the front/local cache for JVM1 has not been shown as populated with A because it is the master for A, or because JVM 1 never accessed A.

926349 wrote:
Assume that a near cache has been defined with a front-scheme and a back-scheme. The front-scheme is a local-scheme and the back-scheme is a distributed-scheme.
Now assume that there is a piece of data for which the current JVM is a master. That is, the data resides in the back cache.
Assume that the JVM accesses that data.
Will this populate the front cache even though the master is in the back cache on the same JVM?
Yes, it will, if access is via the near cache.
Does Coherence therefore store two copies of the data, one in the front cache, one in the back cache?
Yes, but with usual usage patterns the front-map is size limited, so it will hold the just pk-accessed entry in the front map, but it may evict other entries from the front map, so the front-map may not be a full duplicate of the entire data-set.
Or does Coherence realize that the requested data is in the back cache on the same JVM, and therefore doesn't make another copy and populate the front cache, but instead simply redirects the get call to it's own back cache?
Nope, no such logic is in place. On the other hand, as I mentioned front-map is usually size-limited, and also the storage nodes don't have to access the cache via the front-map, they can go directly to the distributed cache by getting the back-cache from the near cache instance.
This basically has memory implications and I'm trying to configure a cache that works on a single JVM as well as a cluster. I am trying to get away with having just the one configuration file for coherence irrespective of whether the application is on a single storage enabled node, or a cluster.
You should not try to. You should always choose the correct topology and configuration for the actual use case. There is no one-size-optimally-fits-all solution.
Best regards,
Robert

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METHOD handle_data_changed.
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Custom F4 is working properly.
Below i am specifing one test case which is my program failed.
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Thanks in Advance

Hello Siva
Some people like to do extensive coding in the event handler method for DATA_CHANGED.
I do NOT belong to these people.
My recommendation is (almost) always the same:
- If required store values in (static) attributes of your event handler class / instance
- Trigger PAI (using method CL_GUI_CFW=>SET_NEW_OK_CODE)
At PAI of your screen you can now easily work with your OUTTAB itab used for the ALV list.
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<< Moderator message - Please do not promise points >>
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