Adding Functionality to Apache NiFi
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The ProcessSession, often referred to as simply a "session," provides a mechanism by which FlowFiles can be created, destroyed, examined, cloned, and transferred to other Processors. Additionally, a ProcessSession provides mechanism for creating modified versions of FlowFiles, by adding or removing attributes, or by modifying the FlowFile's content. The ProcessSession also exposes a mechanism for emitting Provenance Events that provide for the ability to track the lineage and history of a FlowFile. After operations are performed on one or more FlowFiles, a ProcessSession can be either committed or rolled back.