What I mean is that you could obtain such a state in
initializeState(FunctionInitializationContext context) {
context.getOperatorStateStore().getUnionListState(…);
}
and in snapshotState(…), you will just insert the state in only one of the
parallel instances. Which instance can be based on the subtask index (e.g. only
add to the list state if your subtask index is == 0). You can obtain the
subtask index by getRuntimeContext().getIndexOfThisSubtask().
UnionListState will replicate all submitted states to all parallel instances,
so what was checkpointed on one operator instance will be replicated to all in
restore.
Best,
Stefan
> Am 04.07.2017 um 13:56 schrieb gerardg <ger...@talaia.io>:
>
> Thanks Fabian, I'll keep an eye to that JIRA.
>
> I'm not sure I follow you Stefan. You mean that I could implement my own
> OperatorStateStore and override its methods (e.g. snapshot and restore) to
> achieve this functionality? I think I don't have enough knowledge about
> Flink's internals to implement this easily.
>
> Gerard
>
>
>
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