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https://issues.apache.org/jira/browse/FLINK-13417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17001048#comment-17001048
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Till Rohrmann commented on FLINK-13417:
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Unblocking {{1.10.0}} from this issue as it turns out that a new ZooKeeper
client cannot necessarily talk to an older ZooKeeper ensemble. Due to this, we
would break backwards compatibility with older ensembles if we upgrade now to
ZooKeeper 3.5.
Due to this fact, I believe that we have to offer different versions of Flink
(for ZooKeeper 3.4 and ZooKeeper 3.5). Maybe it is as easy as putting a
different ZooKeeper jar into {{lib}} but this needs to be properly tested.
> 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
> Assignee: Till Rohrmann
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.11.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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