[Opensymphony-oscache] groups usage for a newbie

You are right and objects I want to cache always belong to 2 "people", the full set and one parent so duplicate are expected.

Another approach could be to use several caches, as you mentioned earlier, and have a sort of "virtual" cache that is the union of all the others. In that case a query has to be done on each cache when I query the full set. This is a perf. penalty I am not sure to accept, yet.

A map of maps is another way but I am not sure its applicable to OScache. I have to think about it.

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