Pierre Villard created NIFI-16153:
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Summary: Avoid FlowController read lock when reading clustered
state
Key: NIFI-16153
URL: https://issues.apache.org/jira/browse/NIFI-16153
Project: Apache NiFi
Issue Type: Improvement
Reporter: Pierre Villard
FlowController.isClustered() acquires the read lock to return a single boolean,
and every other cluster-state accessor reaches that lock through it, so a
component that reads cluster state while being enabled during flow
synchronization blocks until the synchronizing thread releases the write lock.
Making the clustered field volatile and returning it directly removes the
contention, with no loss of atomicity since the lock only ever guarded a single
boolean read.
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