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Date: Wed, 30 Aug 2017 18:15:00 +0000 (UTC)
From: "Fangmin Lv (JIRA)" <jira@apache.org>
To: dev@zookeeper.apache.org
Message-ID: <JIRA.13096501.1503336935000.161956.1504116900682@Atlassian.JIRA>
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Subject: [jira] [Comment Edited] (ZOOKEEPER-2879) Adding observers
 dynamically without server id
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archived-at: Wed, 30 Aug 2017 18:15:07 -0000


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

Fangmin Lv edited comment on ZOOKEEPER-2879 at 8/30/17 6:14 PM:
----------------------------------------------------------------

(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. Also, we're using the highest 1 byte as the server id, which is limited the number of servers to be less than 256, which is too small for us.

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


was (Author: lvfangmin):
(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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