[jira] [Commented] (SOLR-15055) Re-implement 'withCollection'

["ASF subversion and git services (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-15055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17272118#comment-17272118 ] 

ASF subversion and git services commented on SOLR-15055:
--------------------------------------------------------

Commit 6e9185a33aefa039934adb4c14764030f8e702ea in lucene-solr's branch refs/heads/master from Andrzej Bialecki
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=6e9185a ]

SOLR-15055: Re-implement 'withCollection'.


> Re-implement 'withCollection'
> -----------------------------
>
>                 Key: SOLR-15055
>                 URL: https://issues.apache.org/jira/browse/SOLR-15055
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Andrzej Bialecki
>            Assignee: Andrzej Bialecki
>            Priority: Major
>          Time Spent: 10h 10m
>  Remaining Estimate: 0h
>
> Solr 8x replica placement provided two settings that are very useful in certain scenarios:
>  * {{withCollection}} constraint specified that replicas should be placed on the same nodes where replicas of another collection are located. In the 8x implementation this was limited in practice to co-locating single-shard secondary collections used for joins or other lookups from the main collection (which could be multi-sharded).
>  * {{maxShardsPerNode}} - this constraint specified the maximum number of replicas per shard that can be placed on the same node. In most scenarios this was set to 1 in order to ensure fault-tolerance (ie. at most 1 replica of any given shard would be placed on any given node). Changing this constraint to values > 1 would reduce fault-tolerance but may be desired in test setups or as a temporary relief measure.
>  
> Both these constraints are collection-specific so they should be configured e.g. as collection properties.
>  
> Edit: {{maxShardsPerNode}} constraint will be addressed in another issue.



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