Github user mbalassi commented on the pull request:
https://github.com/apache/flink/pull/1155#issuecomment-145230558
Quick update:
I made some progress on the custom state checkpointer solution, but run
into an issue with key selectors. This would break the current API usage of
aggregations, so I need to solve it or work around it first. [1]
[1] https://issues.apache.org/jira/browse/FLINK-2812
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