NiFi In-Memory Processing

Apache NiFi is an easy-to-use, powerful, highly available, and reliable system to process and distribute data. Made for data flow between source and target systems, it is a simple robust tool to process data from various sources and targets (find more on GitHub). NiFi has 3 repositories:

FlowFile Repository: Stores the metadata of the FlowFiles during the active flow
Content Repository: Holds the actual content of the FlowFiles
Provenance Repository: Stores the snapshots of the FlowFiles in each processor; with that, it outlines a detailed data flow and the changes in each processor and allows an in-depth discovery of the chain of events

NiFi Registry is a stand-alone sub-project of NiFi that allows version control of NiFi. It allows saving FlowFile state and sharing FlowFiles between NiFi applications. Primarily used to version control the code written in Nifi.

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