Brian Nixon created ZOOKEEPER-3394:
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Summary: Delay observer reconnect when all learner masters have
been tried
Key: ZOOKEEPER-3394
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3394
Project: ZooKeeper
Issue Type: Improvement
Components: quorum
Affects Versions: 3.6.0
Reporter: Brian Nixon
Observers will disconnect when the voting peers perform a leader election and
reconnect after. The delay zookeeper.observer.reconnectDelayMs was added to
insulate the voting peers from the observers returning. With a large number of
peers and the observerMaster feature active, this delay is mostly detrimental
as it means that the observer is more likely to get hung up on connecting to a
bad (down/corrupt) peer and it would be better off switching to a new one
quickly.
To retain the protective virtue of the delay, it makes sense to add a delay
that after all observer master's in the list have been tried before iterating
through the list again. In the case where observer master's are not active,
this degenerates to a delay between connection attempts on the leader.
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