When you install NiFi and perform the minimum configuration requirements by editing the nifi.properties file, your installation directory contains several files and directories. Assuming you have installed into an opt/ directory, the NiFi installation directory structure is similar to:

/
-->  opt/
  -->  nifi-current_version
      |--> LICENSE
      |--> NOTICE
      |--> README
      |--> bin/
      |--> conf/
      |--> docs/
      |--> lib/
      |--> work/
      |--> content_repository/
      |--> flowfile_repository/
      |--> logs/
      |--> provenance_repository/

To optmize the NiFi directory structure for upgrade:

	Note
	NiFi 1.0.0 no longer contains authorized-users.xml. Instead, it contains authorizations.xml and users.xml. During upgrade, preserve authorized-users.xml so that NiFi 1.0.0 can use it to populate the values of the authorizations.xml and users.xml files.

A good directory structure that supports easy upgrading looks similar to:

/
|--> opt/
|    |--> nifi-current_version
|    |    |--> LICENSE
|    |    |--> NOTICE
|    |    |--> README
|    |    |--> bin/
|    |    |--> conf/
|    |    |--> docs/
|    |    |--> lib/
|    |    |--> work/
|    |    
|    |--> Configuration_resources/
|    |    |--> authorized-users.xml
|    |    |--> flow.xml.gz
|    |    |--> templates/
|    |    |--> custom_lib/
|
|--> database_repository/
|--> content_repository_1/
|--> content_repository_N
|--> flowfile_repository/
|--> NiFi-logs/
|--> provenance_repository_1/
|--> provenance_repository_N/

	Important
	Upgrading from NiFi 0.x to 1.x converts your database, content, flowfile, log, and provenance repositories automatically. Once upgraded, you can not revert the repositories back to 0.x format.