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https://issues.apache.org/jira/browse/SOLR-5209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14277175#comment-14277175
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Christine Poerschke commented on SOLR-5209:
-------------------------------------------

https://github.com/apache/lucene-solr/pull/118 now updated to remove the 
{{BasicDistributedZkTest.testFailedCoreCreateCleansUp}} test and adjust 
{{UnloadDistributedZkTest.testUnloadShardAndCollection}} and 
{{OverseerTest.testOverseerFailure}} tests.

Would agree that longer-term core creation should not auto-create a collection.

> last replica removal cascades to remove shard from clusterstate
> ---------------------------------------------------------------
>
>                 Key: SOLR-5209
>                 URL: https://issues.apache.org/jira/browse/SOLR-5209
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>    Affects Versions: 4.4
>            Reporter: Christine Poerschke
>            Assignee: Mark Miller
>         Attachments: SOLR-5209.patch
>
>
> The problem we saw was that unloading of an only replica of a shard deleted 
> that shard's info from the clusterstate. Once it was gone then there was no 
> easy way to re-create the shard (other than dropping and re-creating the 
> whole collection's state).
> This seems like a bug?
> Overseer.java around line 600 has a comment and commented out code:
> // TODO TODO TODO!!! if there are no replicas left for the slice, and the 
> slice has no hash range, remove it
> // if (newReplicas.size() == 0 && slice.getRange() == null) {
> // if there are no replicas left for the slice remove it



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