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https://issues.apache.org/jira/browse/SOLR-16872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17744994#comment-17744994
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Ilan Ginzburg commented on SOLR-16872:
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If before split the colocation constraint holds (i.e. "from" replicas covering
the range of "to" replicas on every node where there are "to" replicas), right
after split of a shard of either collection it still holds given split occurs
on the node and does not change the total range on that node nor on other nodes.
Moving replicas around post split can be considered separate from the split,
and such moves should only be allowed for such collections if they do not break
the constraint above.
This might mean not being able to delete "from" replicas from a node if
coverage would be missing for an existing "to" replica on that node (but a new
"from" replica can always be added to another node), and not allowing a "to"
replica to be added to a new node if that new node doesn't already have the
required "from" replicas to cover the "to" replica being added.
> Support split shards in distributed join
> -----------------------------------------
>
> Key: SOLR-16872
> URL: https://issues.apache.org/jira/browse/SOLR-16872
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Mikhail Khludnev
> Priority: Major
>
> SOLR-16717 introduced join of collocated multishard collections
> Here I want to support this operation after shard was split
> cc [~ilan]
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