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https://issues.apache.org/jira/browse/ZOOKEEPER-2879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16136321#comment-16136321
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Michael Han commented on ZOOKEEPER-2879:
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Session id is required to be unique across ensemble only if the session is
global session; for local sessions I don't think there is a hard requirement
for them to be unique since their scope is limited to each server that hosting
the session. Because of this it seems we can only use this feature when local
session is enabled.
> Adding observers dynamically without server id
> ----------------------------------------------
>
> Key: ZOOKEEPER-2879
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2879
> Project: ZooKeeper
> Issue Type: Improvement
> Components: quorum
> Affects Versions: 3.6.0
> Reporter: Fangmin Lv
> Assignee: Fangmin Lv
>
> Dynamic config requires observer has unique server id, which means we cannot
> simply add observer with dynamic server id -1. For large observer cluster,
> it's much more easier to add observer without unique server id if it doesn't
> need to be promoted to participant. Also, it will make dynamic config more
> efficient, we don't need to store and send the long list of observers during
> re-config.
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