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https://issues.apache.org/jira/browse/HBASE-10581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13907830#comment-13907830
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Andrew Purtell commented on HBASE-10581:
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Yes an upgrade script should just delete these znodes. They are only a cache of
persisted data. This can be documented.
Related question is why can't all ZK znodes be cleared before upgrade? Probable
answer: Replication. But that is the subject of another JIRA. :-)
> ACL znode are left without PBed during upgrading hbase0.94* to hbase0.96+
> -------------------------------------------------------------------------
>
> Key: HBASE-10581
> URL: https://issues.apache.org/jira/browse/HBASE-10581
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.98.0, 0.96.0, 0.96.1
> Reporter: Jeffrey Zhong
> Assignee: Jeffrey Zhong
>
> ACL znodes are left in the upgrade process when upgrading 0.94 to 0.96+
> Those 0.94 znodes will choke HMaster because their data aren't PBed.
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