Joerg created NIFI-15888:
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Summary: NiFI UI freezes and stays unresponsible when opening big
content in content-viewer
Key: NIFI-15888
URL: https://issues.apache.org/jira/browse/NIFI-15888
Project: Apache NiFi
Issue Type: Bug
Components: Core UI
Affects Versions: 2.8.0, 2.6.0
Environment: Linux ; Java 21
Reporter: Joerg
Attachments: Screenshot 2026-04-28 152928.png, Screenshot 2026-04-28
153058.png
The NiFi UI gets permanently unresponsible with the content-viewer when opening
a FlowFile content with bigger size (e.g. 600 MB).
Problem scenario :
The NiFi UI freezes after some Frontend activities working with bigger files.
Here i used one file size of 600MB and did : * Open queue list or data
provenance and open the (big) content via "View Content" with the content-viewer
* View Type "hex" limits the displayed content to 10KB. But when i change to
"text" or "json" the UI freezes after some time
* Sometimes the UI recovers after some minutes, sometimes not - then i have to
restart some cluster nodes and everything recovers
The NiFi API keeps responsive and the flows are still working.
This was tested with the following environments:
a) NiFi Version 2.8.0 ; Ubuntu linux; Java 21 ; OnPrem One Node Cluster with
zookeeper 3.9.3
b) NiFi Version 2.6.0 ; Red Hat Linux ; Java 21 ; three node cluster zookeeper
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