@hegdemahendra
There currently are no NiFi processors for ingesting from Delta Lake. There is an existing Apache Jira for creating such list/fetch processors for Delta Lake, but it is still open and does not look to be actively being worked on:
https://issues.apache.org/jira/browse/NIFI-7093
I am not aware of any open source 3rd party options here as well.
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Thank you,
Matt