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https://issues.apache.org/jira/browse/FLINK-13417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16897168#comment-16897168
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Stephan Ewen commented on FLINK-13417:
--------------------------------------

 agree that we need to test this carefully.

[~Tison] would you be interested in helping out with this? Maybe use the 
{{flink-jepsen}} tests (which implement some master failover scenario with ZK) 
to verify this?

> Bump Zookeeper to 3.5.5
> -----------------------
>
>                 Key: FLINK-13417
>                 URL: https://issues.apache.org/jira/browse/FLINK-13417
>             Project: Flink
>          Issue Type: Improvement
>          Components: Runtime / Coordination
>    Affects Versions: 1.9.0
>            Reporter: Konstantin Knauf
>            Priority: Blocker
>             Fix For: 1.10.0
>
>
> User might want to secure their Zookeeper connection via SSL.
> This requires a Zookeeper version >= 3.5.1. We might as well try to bump it 
> to 3.5.5, which is the latest version. 



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