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https://issues.apache.org/jira/browse/FLINK-13417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16915745#comment-16915745
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TisonKun commented on FLINK-13417:
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I started a thread in ZooKeeper community to see if there are known migration
issues and try to handle them for our smooth upgrade. FYI I have been using
3.5.x client communicate with 3.4.x servers for a while and seen no migration
issues so far.
Bump Curator version to 4.2.0 is also a requirement for FLINK-10052. I think it
is orthogonal with bump ZooKeeper.
> 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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