+1 to drop Java 7 support
Flink currently maintains backwards compatibility for savepoint formats, which means that savepoints taken with Flink version 1.1.x and 1.2.x can be resumed in Flink 1.3.x
We are discussing how many versions back to support. The proposition is the following:
Suggestion: Flink 1.4.0 will be able to resume savepoints taken with version 1.3.x and 1.2.x, but not savepoints from version 1.1.x and 1.0.x
The reason for that is that there is a lot of code mapping between the completely different legacy format (1.1.x, not re-scalable) and the key-group-oriented format (1.2.x onwards, re-scalable). It would greatly help the development of state and checkpointing features to drop that old code.
Please let us know if you have concerns about that.
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