Q21. What is “lineageStartDate” of a FlowFile?

Ans: This attribute of the FlowFile represent that, the actual time when the FlowFile inserted or created in NiFi system. Even, it is possible a FlowFile can be cloned, merged, and splitted than a child FlowFile will be created. But the lineageStartDate will tell you the ancestor FlowFile time.

Q22. How to extract the attribute information from a FlowFile?

Ans : There are various processors are available for this purpose e.g ExtractText, EvaluateXQuery etc. Even you can create your custom processor for the same requirement, if no out of the box processor is available for the same.

Q23. Can you add your own define attributes to a FlowFile?

Ans: Yes, there is a processor named UpdateAttribute Processor, which can help you do this activity. UpdateAttribute processor also has an advanced UI, which can help to configure a set of rules for which Attributes should be added.

Q24. Can routing decision made based on attribute value of FlowFile?

Ans: Yes, that is one of the feature of the NiFi. If you want to take decision for FlowFile routing based on attribute than you have to use RouteOnAttribute processor.

Q25. In each property of the processor we can use the Expression language?

Ans: No, only few properties of a processor will have Expression language supported. You can check based on the individual processor, help icon or documents.