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https://issues.apache.org/jira/browse/SOLR-5209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15146134#comment-15146134
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Mark Miller commented on SOLR-5209:
-----------------------------------
I don't agree for the same reasons we have already discussed.
We reserved some leeway for 5x to fix things in this vein, but we didn't do any
of it. To just make this large change in behavior out of the blue in a 5.5
release doesn't make a lot of sense to me. Best done in the 6 release.
> 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: Christine Poerschke
> Priority: Blocker
> Fix For: master, 6.0
>
> Attachments: SOLR-5209.patch, 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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