apache spark - Retrieve Previous Stateful Stream without mapWithState/updateStateByKey -


i working on program using spark streaming, keep stateful key-value paired stream following format:

k: {v1,v2}

where k key , {v1,v2} value/state. whenever there new data coming in, e.g. k:{v3}, state of k updated either mapwithstate or updatestatebykey api.

k:{v1,v2,v3}

i know within mapwithstate, able previous state {v1,v2} , utilize state.exist() or state.update(). there way retrieve state variable outside of mapwithstate?


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