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https://issues.apache.org/jira/browse/ZOOKEEPER-1805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13812456#comment-13812456
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Germán Blanco commented on ZOOKEEPER-1805:
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One mistake above: Epoch in the third paragraph is the election epoch
(n.round), and this did happen to be set to don't care value both in the patch
code and in the constructor in Vote.java. But that was only by chance anyway.
> "Don't care" value in ZooKeeper election breaks rolling upgrades
> ----------------------------------------------------------------
>
> Key: ZOOKEEPER-1805
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1805
> Project: ZooKeeper
> Issue Type: Bug
> Reporter: Flavio Junqueira
> Assignee: Flavio Junqueira
> Priority: Blocker
> Fix For: 3.4.6, 3.5.0
>
> Attachments: ZOOKEEPER-1805-b3.4.patch, ZOOKEEPER-1805.patch,
> ZOOKEEPER-1805.patch, ZOOKEEPER-1805.patch, ZOOKEEPER-1805.patch,
> ZOOKEEPER-1805.patch, ZOOKEEPER-1805.patch, ZOOKEEPER-1805.patch
>
>
> This is an issue that has been originally reported in ZOOKEEPER-1732.
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