Github user bbende commented on the issue:
https://github.com/apache/nifi/pull/473
@mcgilman updated the PR to address the thread-safety, a summary of the
changes...
- Created a single data structure to encapsulate all data structures used
by the FileAuthorizer so there can be a single AtomicReference
- Added synchronization to add, update, delete methods to ensure only one
thread can modify the internal Authorizations reference
- Included changes to expose the root group id to the authorizer which will
be needed to auto-convert old users files
- Brought back the old users.xsd and generation of the jaxb object to prep
for auto-converting old users files
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