About zzzz77

zzzz77 · ‎12-17-2025

Thanks Matt, thats a very useful explanation.

zzzz77 · ‎12-17-2025

Hi I wanted to look into a need to transfer 1 TB files by using chunking in Nifi. Each file also has to have its 20 items of meta data associated with it remain intact so the metadata and the data both survive the breaking up of the file ( chunking ) into 1000 chunks and re-assembling the file at the destination ( de-chunking ). Also, is the meta data for the large file duplicated onto each of the file 1000 chunks or is it a sub-set of the meta data? Someone mentioned nifi passes the file chunks data through JVM memory on its way to the content repository. Can I confirm whether file chunks pass through JVM memory as they are written to the file/content repository for a large file ( or any file for that matter ?) - I was fairly sure they aren't, otherwise the JVM size ( limited by machine RAM ) on the machine would limit reading in of large file data, and that would limit large file transfer speed - is that correct? I'm trying to confirm my understanding of how Nifi handles these large files please. Any help appreciated.

zzzz77 · ‎12-13-2025

Hi, I did some further digging and found this post ( below ) which has fixed my problem. https://community.cloudera.com/t5/Support-Questions/No-show-Users-and-Policies-in-Global-Menu/td-p/339127 This prompted some questions on nifi security and how its supposed to function. My setup is as a stand alone nifi instance on windows 10. The main reason I wanted admin privs for my generated user was to be able to create new processors and links etc. So I have a couple of questions please: Once I have created processors etc, should I drop the user back to being a normal user instead of being an admin? Is Nifi normally designed to be (say) LDAP connected ? If I wanted to have multiple users as admins, what is the best way to do this on a stand alone instance, or is this something that perhaps should be via LDAP created groups? I think I may not fully understand the concept behind nifi security and how its supposed to work? I'm new-ish to nifi and am used to windows and its security. Thanks in advance.

zzzz77 · ‎12-11-2025

Hi, So I have a standard stand alone install of nifi 2.5.0 on windows 10 ( no LDAP etc ) which created a generated username and password, and which allows me to log in fine. What I want to do is change this existing nifi generated user from being a normal user to an administrator. Its so i can create new processors via the api. Apparently on the very first login to a new nifi instance it logs you in as admin, but I tried this and couldnt see any options on the menu etc that looked like I had admin privs. But when it starts and runs, it uses port 8400, so its possible someone in the company may have modified the set up slightly? When it starts for the first time it goes through the expansion process. Can someone please suggest the steps to change the generated normal user to admin level please, or if maybe I'm going about this the wrong way? I have consulted the following doco but no joy. https://nifi.apache.org/nifi-docs/administration-guide.html#creating-users-groups I have spent 4 hours today trying to work it out and every time i try making changes to the authorizers.xml and login-authentical-provider.xml and just refuses to start due to java errors. Any help appreciated Thanks in advance.

zzzz77 · ‎12-11-2025

Hi Matt, What I discovered is that when running nifi on windows 10 ( and possibly linux as well?), any passwords that have special characters like + or \ etc need to be converted to ascii I think it is. so : / becomes %2F + becomes %2B Once i did this, it worked OK.

zzzz77 · ‎11-26-2025

Hi, Thanks, will do. I did try reading Provenance data via the nifi 2.5.0 API and it seems to fail I installed NIfi on my PC with no modifications and all default settings, and just use the default user and password that's created when you install it. I run this in my local windows CMD window and get "unknown error" : curl --insecure -X POST -H "Authorization: Bearer <my token> " https://localhost:8443/nifi-api/provenance Then I run this and get : curl --insecure -X POST -H "Authorization: Bearer <token>" https://localhost:8443/nifi-api/provenance > test.txt In text.txt file I get : "An unexpected error has occurred. Please check the logs for additional details." I just wanted to check I have the syntax right. I ran other API queries for flows etc and they work fine. What I'm trying to do is get a list of all files that have passed through my small local nifi installation so we can track what files have moved through nifi and when, as a form of monitoring.

zzzz77 · ‎11-24-2025

Hi What is the preferred method to alter a nifi processor configuration please? We want to be able to get a user to choose from one of 3 options from a drop down menu in a GUI screen. The chosen option then is passed to either a curl command to make changes to the processor via the Nifi API, or can we create a python command to then alter a nifi processor configuration possibly by curl, but maybe there is another way? Curl looks a safer option, but python might be better? Not sure....? Thanks in advance.

zzzz77 · ‎11-22-2025

When I try to run a query against the nifi 2.5.0 API to get info about provenance activities, it seems to be quite difficult. I installed NIfi on my PC with no modifications and all default settings, and just use the default user and password that's created when you install it. I run this in my local windows CMD window and get "unknown error" : curl --insecure -X DELETE -H "Authorization: Bearer <my token> " https://localhost:8443/nifi-api/provenance/queries Then I run this and get : curl --insecure -X DELETE -H "Authorization: Bearer <token>" https://localhost:8443/nifi-api/provenance/queries > test.txt In text.txt file I get : "An unexpected error has occurred. Please check the logs for additional details." I'm starting to think the Provenance part of the API might be broken as it shouldn't be this hard? I ran other API queries and they work fine. What I'm trying to do is get a list of all files that have passed through my small local nifi installation so we can track what files have moved through nifi and when, as a form of monitoring. Any help appreciated! Thanks in advance.

zzzz77 · ‎11-22-2025

Hi, Apologies for asking this here, as a new member of the forum I want to post new questions but don't seem to have the ability to do so. Can someone please explain how I can do this as I want to ask some technical questions about nifi, in particular API queries for provenance. Thank you.

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Cloudera Community

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