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https://issues.apache.org/jira/browse/SOLR-11990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16547692#comment-16547692
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Shalin Shekhar Mangar commented on SOLR-11990:
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I added more changes on top of Noble's last patch and pushed it to a branch
{{jira/solr-11990}}.
Changes:
# Removed nocommit in CreateCollectionCmd. Now we do all input validations
before we try to assign replicas so that in case the collection could not be
created, we are not left with dangling collection references in the cluster
state
# Added more tests in {{TestWithCollection.testNodeAdded}} and
{{TestPolicy.testWithColl}}
> Make it possible to co-locate replicas of multiple collections together in a
> node
> ---------------------------------------------------------------------------------
>
> Key: SOLR-11990
> URL: https://issues.apache.org/jira/browse/SOLR-11990
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Components: AutoScaling, SolrCloud
> Reporter: Shalin Shekhar Mangar
> Assignee: Shalin Shekhar Mangar
> Priority: Major
> Fix For: master (8.0), 7.5
>
> Attachments: SOLR-11990.patch, SOLR-11990.patch, SOLR-11990.patch,
> SOLR-11990.patch, SOLR-11990.patch, SOLR-11990.patch, SOLR-11990.patch
>
>
> It is necessary to co-locate replicas of different collection together in a
> node when cross-collection joins are performed.
> while creating a collection specify the parameter
> {{withCollection=other-collection-name}} . This ensure that Solr always
> ensure that atleast one replica of {{other-cllection}} is present with this
> collection replicas
> This requires changing create collection, create shard and add replica APIs
> as well because we want a replica of collection A to be created first before
> a replica of collection B is created so that join queries etc are always
> possible.
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