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https://issues.apache.org/jira/browse/SOLR-13170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16753864#comment-16753864
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Andrzej Bialecki commented on SOLR-13170:
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This is likely related to SOLR-10211 - the request took too long so the UI
tried to re-submit it, at which point the collection already existed in the
cluster state, but its construction was still ongoing.
> Creating a 10x4 collection in the admin UI shows errors even though the
> collection is successfully created
> ----------------------------------------------------------------------------------------------------------
>
> Key: SOLR-13170
> URL: https://issues.apache.org/jira/browse/SOLR-13170
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Admin UI
> Affects Versions: 8.0, master (9.0)
> Reporter: Erick Erickson
> Priority: Minor
>
> Steps to reproduce:
> - Set up a 4-node collection (I did this locally)
> - Use the admin UI to create a collection with the _default configset, 10
> shards and 4 replicas each. Make sure to make maxShardsPerNode 10 too.
> - Go ahead and create it.
> The Admin UI cranks away for a bit then says "Collection to Solr lost" and
> "Collection already exists". However, the collection is created successfully.
> I do see this in the logs:
> ERROR (OverseerThreadFactory-9-thread-2-processing-n:192.168.1.122:8981_solr)
> [ ] o.a.s.c.a.c.OverseerCollectionMessageHandler Collection: eoe operation:
> create failed:org.apache.solr.common.SolrException: collection already
> exists: eoe
> cUrling in this command reports no errors, either on the terminal window or
> in the logs:
> http://localhost:8981/solr/admin/collections?action=CREATE&name=eoe1&numShards=10&replicationFactor=4&maxShardsPerNode=10&collection.configName=_default
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