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https://issues.apache.org/jira/browse/SOLR-5756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14695793#comment-14695793
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Shalin Shekhar Mangar commented on SOLR-5756:
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The problem is that the ZkStateReader automatically deletes a collection from
cluster state once it sees that the state node no longer exists but some times
the actual core unload command reaches the node after said state.json is
deleted and the node replies by saying that it could not find such a core.
> A utility API to move collections from stateFormat=1 to stateFormat=2
> ---------------------------------------------------------------------
>
> Key: SOLR-5756
> URL: https://issues.apache.org/jira/browse/SOLR-5756
> Project: Solr
> Issue Type: New Feature
> Components: SolrCloud
> Reporter: Noble Paul
> Assignee: Shalin Shekhar Mangar
> Fix For: Trunk, 5.4
>
> Attachments: CollectionStateFormat2Test-failure.log,
> SOLR-5756-part2.patch, SOLR-5756-trunk.patch, SOLR-5756.patch,
> SOLR-5756.patch, SOLR-5756.patch
>
>
> SOLR-5473 allows creation of collection with state stored outside of
> clusterstate.json. We would need an API to move existing 'internal'
> collections outside
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