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From "Fangmin Lv (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2879) Adding observers dynamically without server id
Date Wed, 30 Aug 2017 18:01:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16147696#comment-16147696
] 

Fangmin Lv commented on ZOOKEEPER-2879:
---------------------------------------

(Sorry for the lately reply, was oncall and handling prod issues)

[~dbenediktson] and [~hanm], thanks for the comments, the main purpose is to make the server
maintain easier, we have more than 500 observers, which are also frequently being replaced
and decommed, which makes the tool hard to work correctly. 

The issue do exist for non unique session id, we're thinking of ways to solve it.

> 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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