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https://issues.apache.org/jira/browse/ZOOKEEPER-1987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14073753#comment-14073753
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Hongchao Deng commented on ZOOKEEPER-1987:
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[~shralex]
My first thought is that it's a little ambiguous to put version under the 
server list. It's best to give reusable config file. A version and other info 
could be separated.

> Storing the version in a separate file creates a problem of keeping this file 
> in sync with the dynamic config file.

It's doable. A server can hold acking back until files are finished. And it 
takes the final written file as a flag. Anyway, it's a bit of work but doable.

> unable to restart 3 node cluster
> --------------------------------
>
>                 Key: ZOOKEEPER-1987
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1987
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: tests
>    Affects Versions: 3.5.0
>            Reporter: Patrick Hunt
>            Assignee: Alexander Shraer
>            Priority: Blocker
>             Fix For: 3.5.0
>
>         Attachments: ZOOKEEPER-1987-ver1.patch, ZOOKEEPER-1987-ver2.patch, 
> ZOOKEEPER-1987-ver3.patch, ZOOKEEPER-1987.patch, f1.jstack, l3.jstack, 
> test3.tar.gz
>
>
> I tried a fairly simple test, start a three node cluster, bring it down, then 
> restart it. On restart the servers elect the leader and send updates, however 
> the negotiation never completes - the client ports are never bound for 
> example.



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