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Nifi: how does nifi processors get flowfiles from upstream connections?

I want to write Custom processor , and i want to know how does :fileQueue,inProcess,recentlyProcessed,queueLock this elemenst work inside processors . (can you link me any good article whcih can show me whole cycle of this processSessions and upsetrem connections.)


Super Guru
@sally sally

Here is what you want to read. I recommend reading both links - it's same webpage and its not too long. --> specific answer to your question.