tkobayas commented on PR #6734:
URL: 
https://github.com/apache/incubator-kie-drools/pull/6734#issuecomment-4561677282

   > ListDataStore used IdentityHashMap which does not preserve insertion 
order, causing subscribe() to replay events in arbitrary order and breaking 
sliding window CEP behavior. 
   
   Note that the existing `CepTest` doesn't hit this issue, because it uses 
`DirectDataStream` which doesn't store data, so doesn't have this problem.
   
   While CEP use cases expect to use `DataStream` rather than `DataStore`, 
users would still expect "List" named class to preserve insertion order. Right?
   
   


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