Thawan Kooburat created ZOOKEEPER-1692:
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Summary: Add support for single member ensemble
Key: ZOOKEEPER-1692
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1692
Project: ZooKeeper
Issue Type: Improvement
Components: quorum
Affects Versions: 3.4.0
Reporter: Thawan Kooburat
Assignee: Thawan Kooburat
Priority: Minor
In the past, we ran into problem where quorum could not be formed multiple
times. It take a while to investigate the root cause and fix the problem.
Our current solution is to make it possible to run a quorum with a single
member in it. Unlike standalone mode, it has to run as LeaderZooKeeper server,
so that the observers can connect to it.
This will allow the operator to use this workaround to bring back the ensemble
quickly while investigating the problem in background.
The main problem here is to allow the observers to connect with the leader when
the quorum size is reduced to one. We don't want to update the (static)
configuration on the observer since it require server restart. We are thinking
of allowing the observer to connect to any participant which declared that it
is the leader without running the leader election algorithm (because it won't
have enough votes).
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