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General Application/Framework
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Q: Where can I find information about upgrading to a new NiFi version? - A: We are still working on providing a real upgrade guide; however, in the meantime, there are some notes on upgrading in the System Properties section of the Administrator Guide. These tips have to do with setting up your current NiFi in such a way that will make upgrading easier
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Processors
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Q: ListenHTTP - I have built most of our production flow in NiFi. Part of the data is received from thousands of distributed components via the ListenHTTP processor. I now need to add some automatic registration for these components (this assigns some ID to the component) and enable authentication using the generated ID. Is this possible to implement with the current version? The registration could happen outside (maybe using Play), but the file reception should happen in NiFi in order to initiate the flow. - A: The ListenHTTP processor isn't so general purpose as to support custom designed authentication and authorization schemes. You could use it to restrict who can provide data through use of HTTPS and specific certificate DN patterns or to simply accept whatever data is brought in and then have a follow-on processor in the flow choose to drop data or not because it knows and trusts the source though. If you want to be able to block data as a client component tries to feed it to NiFi using a custom scheme, then you'll probably want to look at a custom processor or wire together the HandleHttpRequest and HandleHttpResponse processors. With those you can build a rather custom and powerful API/interface and have it support your own chosen authentication and authorization scheme on top of HTTP/S. With those processors if you understand HTTP well you can basically visually construct a web service. It requires the user to have a lot of knowledge to get the most of out it though.
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