Mark Bathori created NIFI-10974:
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Summary: Incorrect warning message on memory usage from
MonitorMemory
Key: NIFI-10974
URL: https://issues.apache.org/jira/browse/NIFI-10974
Project: Apache NiFi
Issue Type: Bug
Reporter: Mark Bathori
Assignee: Mark Bathori
There are certain cases when the MonitorMemory reporting task is sending
incorrect warning messages on memory usage crossing the threshold.
{+}Repro steps{+}:
* In the MonitorMemory reporting task, set the threshold value to low enough
that the current memory usage is crossing that value.
* Restart NiFi while the monitoring task is still running.
* After the restart set the threshold to higher value above the actual memory
usage.
* The warning messages will be still send despite the threshold is above the
actual memory usage.
The main problem is that the *isCollectionUsageThresholdExceeded()* method call
on *MemoryPoolMXBean* have a *gcSensor* registered at the VM that's 'on'
attribute will get stuck on 'true' value. This will cause the method to always
return with exceeded. The sensor will get reseted on the next garbage
collection but until that it will send false messages.
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