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https://issues.apache.org/jira/browse/NIFI-10974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Bathori updated NIFI-10974:
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Status: Patch Available (was: Open)
> 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
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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