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https://issues.apache.org/jira/browse/SOLR-11832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16321233#comment-16321233
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Varun Thacker commented on SOLR-11832:
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Hi Tim,
Is SOLR-11586 what you're looking for?
> Restore from backup creates old format collections
> --------------------------------------------------
>
> Key: SOLR-11832
> URL: https://issues.apache.org/jira/browse/SOLR-11832
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Backup/Restore
> Affects Versions: 7.2, 6.6.2
> Reporter: Tim Owen
> Assignee: Varun Thacker
> Priority: Minor
> Attachments: SOLR-11832.patch
>
>
> Restoring a collection from a backup always creates the new collection using
> the old format state json (format 1), as a global clusterstate.json file at
> top level of ZK. All new collections should be defaulting to use the newer
> per-collection (format 2) in /collections/.../state.json
> As we're running clusters with many collections, the old global state format
> isn't good for us, so as a workaround for now we're calling
> MIGRATESTATEFORMAT immediately after the RESTORE call.
> This bug was mentioned in the comments of SOLR-5750 and also recently
> mentioned by [~varunthacker] in SOLR-11560
> Code patch attached, but as per [~dsmiley]'s comment in the code, fixing this
> means at least 1 test class doesn't succeed anymore. From what I can tell,
> the BasicDistributedZk2Test fails because it's not using the official
> collection API to create a collection, it seems to be bypassing that and
> manually creating cores using the core admin api instead, which I think is
> not enough to ensure the correct ZK nodes are created. The test superclass
> has some methods to create a collection which do use the collection api so I
> could try fixing the tests (I'm just not that familiar with why those
> BasicDistributed*Test classes aren't using the collection api).
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