Todd Greenwood-Geer commented on ZOOKEEPER-481:

ZOOKEEPER-481.patch fails to build when applied to branch-3.2 due to a missing 
file, PortAssignment.java. PortAssignment.java was added in 
ZOOKEEPER-473.patch. I have not investigated further dependencies, so I do not 
know if 481 depends on other files in 473. Patrick suggested that we may need 
separate patches for branch-3.2 and trunk.

> Add lastMessageSent to QuorumCnxManager
> ---------------------------------------
>                 Key: ZOOKEEPER-481
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-481
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: leaderElection
>    Affects Versions: 3.1.1, 3.2.0
>            Reporter: Flavio Paiva Junqueira
>            Assignee: Flavio Paiva Junqueira
>             Fix For: 3.2.1, 3.3.0
>         Attachments: ZOOKEEPER-481.patch, ZOOKEEPER-481.patch, 
> 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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