Flavio Paiva Junqueira updated ZOOKEEPER-599:

    Attachment: ZOOKEEPER-599.patch

Attaching preliminary patch. Currently it adds code to FLE and QCM to support 
observers later. it does not change anything for observers yet.

One comment, perhaps important, is that I'm considering that observers may not 
have identifiers in the future. If they have, it will force us to add every 
single observer to the configuration file of every participant, which might not 
be desirable. In the way I'm implementing, it does not matter whether observers 
have concrete identifiers or not. 

> Changes to FLE and QuorumCnxManager to support Observers
> --------------------------------------------------------
>                 Key: ZOOKEEPER-599
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-599
>             Project: Zookeeper
>          Issue Type: Improvement
>            Reporter: Flavio Paiva Junqueira
>            Assignee: Flavio Paiva Junqueira
>         Attachments: ZOOKEEPER-599.patch
> Observers currently can only use electionAlg 0, which is not the default, 
> supported leader implementation. This issue will fix it.

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