Recently there was a start of a discussion regarding singleton cache stores and how they behave. Interestingly according to our documentation [1] and verification code [2] a singleton store cannot be used with a shared cache store. This makes no sense to me as this means you would have a single point of failure for your data. And also as Dan pointed out [3] there is no Singleton cache loader to make sure all the loads are from the coordinator either, which means you could have a read that returns null despite it being in the store/loader.
And even looking at [4] it talks about singleton being used so not every node writes to the underlying store, which implies it being shared. I think we have enough proof to update this so a singleton store requires a shared store, but I wanted to make sure we weren't missing something here. Thanks, - Will [1] http://infinispan.org/docs/9.0.x/user_guide/user_guide.html#_configuration_2 [2] https://github.com/infinispan/infinispan/blob/master/core/src/main/java/org/infinispan/configuration/cache/PersistenceConfigurationBuilder.java#L108 [3] https://github.com/infinispan/infinispan/pull/4382#discussion_r65360312 [4] https://github.com/infinispan/infinispan/blob/master/core/src/main/java/org/infinispan/persistence/support/SingletonCacheWriter.java#L40
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