Flavio Paiva Junqueira commented on ZOOKEEPER-481:

No, ZOOKEEPER-22 is about client-to-server communication, and this one is 
affects server-to-server communication in particular during leade election. 

> Add lastMessageSent to QuorumCnxManager
> ---------------------------------------
>                 Key: ZOOKEEPER-481
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-481
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: leaderElection
>            Reporter: Flavio Paiva Junqueira
>         Attachments: ZOOKEEPER-481.patch
> Currently we rely on TCP for reliable delivery of FLE messages. However, as 
> we concurrently drop and create new connections, it is possible that a 
> message is sent but never received. With this patch, cnx manager keeps a list 
> of last messages sent, and resends the last one sent. Receiving multiples 
> copies is harmless. 

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