The contents of the nifi.properties file are relatively stable but can change from version to version. It is always a good idea to review this file when upgrading and pay attention to any changes.
Consider configuring items below marked with an asterisk (
*) in such a way
that upgrading will be easier. For example, change the default directory configurations to
locations outside the main root installation. In this way, these items can remain in their
configured location through an upgrade, allowing NiFi to find all the repositories and
configuration files and pick up where it left off as soon as the old version is stopped and
the new version is started. Furthermore, the administrator may reuse this
nifi.properties file and any other configuration files without having to
re-configure them each time an upgrade takes place. See Upgrading NiFi for more details.