Github user gyfora commented on the pull request: https://github.com/apache/flink/pull/1239#issuecomment-146467354 So my argument is that the overhead of implementing the Checkpointed interface for simple counters , offsets and the like is simply too much (and annoying). We can also introduce some annotations that the user can use to tag the state with. Then the only thing we need to make sure is so that these support some custom checkpointing logic. (like the state checkpointer interface) Another thing we should consider is that the Checkpointed interface will never allow any lazy state access logic.
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