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From "Shalin Shekhar Mangar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-11990) Make it possible to co-locate replicas of multiple collections together in a node using policy
Date Tue, 01 May 2018 20:15:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-11990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16460096#comment-16460096
] 

Shalin Shekhar Mangar commented on SOLR-11990:
----------------------------------------------

I've attached another approach which does not modify the policy framework directly but instead
modifies Suggesters and Collection APIs to maintain the co-location of two collections. This
is still a work in progress and has many nocommits.

> Make it possible to co-locate replicas of multiple collections together in a node using
policy
> ----------------------------------------------------------------------------------------------
>
>                 Key: SOLR-11990
>                 URL: https://issues.apache.org/jira/browse/SOLR-11990
>             Project: Solr
>          Issue Type: Sub-task
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: AutoScaling, SolrCloud
>            Reporter: Shalin Shekhar Mangar
>            Assignee: Shalin Shekhar Mangar
>            Priority: Major
>             Fix For: 7.4, master (8.0)
>
>         Attachments: 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. The policy rules framework should support this use-case.
> Example: Co-locate exactly 1 replica of collection A in each node where a replica of
collection B is present.
> {code}
> {"replica":">0", "collection":"A", "shard":"#EACH", "withCollection":"B"}
> {code}
> 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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