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https://issues.apache.org/jira/browse/ZOOKEEPER-1633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexander Shraer updated ZOOKEEPER-1633:
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Attachment: ZOOKEEPER-1633.patch
Attaching patch from 3.4 branch.
> 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
>
>
> Currently the first message a server sends to another server is just its 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 message to be a protocol number (e.g., a negative
> number that can't be a server id). The second message will be the server id.
> The third message is number of bytes in the remainder of the message. A 3.4
> server will read the first long as before, but if this is a negative number
> it will read the second long to find the server id, and then remove the
> remainder of the message from the stream. This will not affect 3.4 since the
> information sent in 3.4 is always a server id. It will provide the necessary
> flexibility for future releases as well as an upgrade path from 3.4
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