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https://issues.apache.org/jira/browse/SOLR-5756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14620564#comment-14620564
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Noble Paul commented on SOLR-5756:
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The steps to migrate state from main clusterstate.
# Add support to ZKStateReader to lookup the
{{/collections/<collection-name>state.json}} if a collection is suddenly
missing from the main {{clusterstate.json}} . If the {{state.json}} is found
add a listener to that if that requires to be watched
# Add a collection-admin command to migrate the state outside
A user should first upgrade all servers to a new version and then execute the
command
> A utility API to move collections from internal to external
> -----------------------------------------------------------
>
> Key: SOLR-5756
> URL: https://issues.apache.org/jira/browse/SOLR-5756
> Project: Solr
> Issue Type: Bug
> Reporter: Noble Paul
> Assignee: Noble Paul
>
> 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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