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https://issues.apache.org/jira/browse/ZOOKEEPER-1149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Hunt reassigned ZOOKEEPER-1149:
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Assignee: Patrick Hunt
> users cannot migrate from 3.4->3.3->3.4 server code against a single datadir
> ----------------------------------------------------------------------------
>
> Key: ZOOKEEPER-1149
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1149
> Project: ZooKeeper
> Issue Type: Task
> Components: server
> Affects Versions: 3.4.0
> Reporter: Patrick Hunt
> Assignee: Patrick Hunt
> Priority: Blocker
> Fix For: 3.4.0
>
>
> 3.4 is checking acceptedEpoch/currentEpoch files against the snap/log files
> in datadir. These files are new in 3.4. If they don't exist the server will
> create them, however if they do exist the server will validate them.
> As a result if a user
> 1) upgrades from 3.3 to 3.4 this is fine
> 2) downgrades from 3.4 to 3.3 this is also fine (3.3 ignores these files)
> 3) however, 3.4->3.3->3.4 fails because 3.4 will see invalid *Epoch files in
> the datadir (as 3.3 would have ignored them, applying changes to snap/log w/o
> updating them)
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