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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