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https://issues.apache.org/jira/browse/SOLR-5638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley resolved SOLR-5638.
--------------------------------
    Resolution: Fixed

I'm closing this issue since it has already been fixed in some Solr version or 
another; not sure which.  I verified for sure in 6.x... and I see the check in 
5.4 and it probably got added even prior to that.
(not sure what JIRA resolution is right for this scenario but I'll just use 
"Fixed")

> Collection creation partially works, but results in unusable configuration 
> due to missing config in ZK
> ------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-5638
>                 URL: https://issues.apache.org/jira/browse/SOLR-5638
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>    Affects Versions: 4.6
>            Reporter: Nathan Neulinger
>         Attachments: SOLR-5638.patch
>
>
> Need help properly recovering from 'collection gets created without config 
> being defined'.
> Right now, if you submit a collection create and the config is missing, it 
> will proceed with partially creating cores, but then the cores fail to load. 
> This requires manual intervention on the server to fix unless you pick a new 
> colllection name:
> What's worse - if you retry the create a second time, it will usually try to 
> create the replicas in the opposite order, resulting in TWO broken cores on 
> each box, one for each attempted replica. 
> beta1-newarch_hive1_v12_shard1_replica1: 
> org.apache.solr.common.cloud.ZooKeeperException:org.apache.solr.common.cloud.ZooKeeperException:
>  Specified config does not exist in ZooKeeper:hivepoint-unknown
> beta1-newarch_hive1_v12_shard1_replica2: 
> org.apache.solr.common.cloud.ZooKeeperException:org.apache.solr.common.cloud.ZooKeeperException:
>  Specified config does not exist in ZooKeeper:hivepoint-unknown
> I already know how to clear this up manually, but this is something where 
> solr is allowing a condition in external service to result in a 
> corrupted/partial configuration. 
> I can see an easy option for resolving this as a workaround - allow a 
> collection CREATE operation to specify "reuseCores"  - i.e. allow it to use 
> an existing core of the proper name if it already exists. 
> Right now you wind up getting:
> org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException:Error 
> CREATEing SolrCore 'beta1-newarch_hive1_v12_shard1_replica1': Could not 
> create a new core in solr/beta1-newarch_hive1_v12_shard1_replica1/as another 
> core is already defined there
> org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException:Error 
> CREATEing SolrCore 'beta1-newarch_hive1_v12_shard1_replica2': Could not 
> create a new core in solr/beta1-newarch_hive1_v12_shard1_replica2/as another 
> core is already defined there



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