Github user markap14 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/900#discussion_r75788681
--- Diff:
nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/leader/election/LeaderElectionManager.java
---
@@ -40,7 +35,8 @@
void register(String roleName, LeaderElectionStateChangeListener
listener);
/**
- * Adds a new role for which a leader is required, providing the given
value for this node as the Participant ID
+ * Adds a new role for which a leader is required, providing the given
value for this node as the Participant ID. If the Participant ID
+ * is <code>null</code>, this node will never be elected leader but
will passively observe changes to the leadership.
--- End diff --
@JPercivall that means the node will never been elected leader... unless it
later re-registers, providing a Participant ID. I.e., the node can register as
an observer and later re-register as a participant.
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