Stijn Caerts created NIFI-12532:
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Summary: Possible memory leak in ConnectionLoadBalanceServer
Key: NIFI-12532
URL: https://issues.apache.org/jira/browse/NIFI-12532
Project: Apache NiFi
Issue Type: Bug
Reporter: Stijn Caerts
The ConnectionLoadBalanceServer possibly contains a memory leak.
When analyzing a heap dump of a NiFi node in our clustered setup with version
1.16.3, a large part of the used memory was related to the
{{ConnectionLoadBalanceServer}}.
It had a retained size of 1,770,787,761 B (25.1%), with 106,710
{{CommunicationAction}} objects taking up most of that size 1,770,787,608 B
(25.1%).
I checked the code of the {{ConnectionLoadBalanceServer}} to try to understand
why it uses this much memory. This is when I noticed that
{{CommunicationAction}} objects are only removed when the
{{ConnectionLoadBalanceServer}} is stopped, creating a possible memory leak.
Although we're not running the most recent version of NiFi, this is still
present in the current version of the code.
https://github.com/apache/nifi/blob/main/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/queue/clustered/server/ConnectionLoadBalanceServer.java#L110
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