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https://issues.apache.org/jira/browse/SOLR-5209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13868054#comment-13868054
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Ramkumar Aiyengar commented on SOLR-5209:
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FWIW, newer API actually won't allow you to do exactly what this does. The
shard delete API (sensibly) explicitly checks if we have a null range or if we
are not an active shard. This potentially lops out an active shard with an
assigned range leaving the cluster state broken. I actually don't know if
there's a way to get the cluster state back to a sensible state without
modifying it by hand or recreating it altogether by nuking ZK state -- when we
tried bringing up the replica after this, it got assigned to a shard with an
empty range..
I guess if we plan to get to the ZK truth mode sometime soon, its fine to drop
this patch. We mainly meant for this as an interim step to ensure someone
doesn't accidentally burn their fingers..
> cores/action=UNLOAD of last replica removes 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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