Preserving customized NAR files
If you have customized any of the default NAR files, the upgrade to NiFi 1.0.0 overwrites these changes. To preserve the customization:
Identify and save the changes you have made to the default NAR files.
Perform your upgrade to NiFi 1.0.0.
Redo the changes you have made to the NAR files, in NiFi 1.0.0.
Start a dataflow.