aljoscha commented on issue #1668: [FLINK-3257] Add Exactly-Once Processing Guarantees for Iterative DataStream Jobs URL: https://github.com/apache/flink/pull/1668#issuecomment-541619902 I'm closing this as "Abandoned", since there is no more activity and the code base has moved on quite a bit. I think the feature is still very needed, the Jira issue remains open, and there is also a new FLIP about it: https://cwiki.apache.org/confluence/display/FLINK/FLIP-16%3A+Loop+Fault+Tolerance
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