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https://issues.apache.org/jira/browse/ZOOKEEPER-1633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792141#comment-13792141
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Raul Gutierrez Segales commented on ZOOKEEPER-1633:
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Now that I come to think of it, I might have seen it in prod.
> Introduce a protocol version to connection initiation message
> -------------------------------------------------------------
>
> Key: ZOOKEEPER-1633
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1633
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Reporter: Alexander Shraer
> Assignee: Alexander Shraer
> Fix For: 3.4.6
>
> Attachments: ZOOKEEPER-1633.patch, ZOOKEEPER-1633-v4.patch,
> ZOOKEEPER-1633-v4.patch, ZOOKEEPER-1633-ver2.patch, ZOOKEEPER-1633-ver3.patch
>
>
> Currently the first message a server sends to another server includes just
> one field - the server's id (long). This is in QuorumCnxManager.java. This
> makes changes to the information passed during this initial connection very
> difficult. This patch will change the first field of the message to be a
> protocol version (a negative number that can't be a server id). The second
> field will be the server id. The third field is number of bytes in the
> remainder of the message. A 3.4 server will read the first field as before,
> but if this is a negative number it will read the second field to find the
> server id, and then remove the remainder of the message from the stream. This
> will not affect 3.4 since 3.4 and earlier servers send just the server id (so
> the code in the patch will not run unless there is a server > 3.4 trying to
> connect). This will, however, provide the necessary flexibility for future
> releases as well as an upgrade path from 3.4
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