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https://issues.apache.org/jira/browse/FLINK-13417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16943572#comment-16943572
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Stephan Ewen commented on FLINK-13417:
--------------------------------------

Sorry for having been out of this thread for a while.

If there is a way to avoid explicitly shaded modules (especially inside Flink) 
I believe that this is preferable. We are also trying hard to get other 
statically relocated libraries moved to flink-shaded.

 Is ZK used in more than one module (also outside flink-runtime)? In not, then 
it should be sufficient to just shade it inside the runtime package.
If it is used in other places, is it used directly, or is it used through a 
runtime utility? If we can get to the later case, we could have ZK only 
shaded/relocated in flink-runtime.

> 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: Major
>             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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