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https://issues.apache.org/jira/browse/SOLR-16872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17744767#comment-17744767
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Mikhail Khludnev commented on SOLR-16872:
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[~ilan], Continuing conversation SOLR-16717.
It seems splitting shards is problematic unless splitting occurs in both sides 
of constraints ie we need to split secondary and primary collection shards 
together in the same moment. Otherwise, splitting secondary shards implies 
moving shards to (probably) other nodes and violates constraint for primary 
collection shards. WDYT?  

> 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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