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https://issues.apache.org/jira/browse/SOLR-13258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16769630#comment-16769630
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Christine Poerschke commented on SOLR-13258:
--------------------------------------------
(I have no foreseeable plans to pursue this feature here, just opening this new
ticket for clarity as distinct from the old SOLR-6730 ticket which [~janhoy]
kindly surfaced and commented upon this week.)
> 'sticky' replica affinity support
> ---------------------------------
>
> Key: SOLR-13258
> URL: https://issues.apache.org/jira/browse/SOLR-13258
> Project: Solr
> Issue Type: New Feature
> Reporter: Christine Poerschke
> Priority: Minor
>
> Creating this ticket as both similar to and different from the SOLR-6730
> {{select?replicaAffinity=(node|host) and replicaAffinity.hostPriorities
> support}} ticket.
> copy/paste-ing a potential approach from the
> https://issues.apache.org/jira/browse/SOLR-6730?focusedCommentId=15583110&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15583110
> update:
> {quote}
> * Two numeric parameters ('seed' and 'mod') are optionally added to each
> request.
> * The two parameters 'place' the requests within the cloud, e.g. for
> {{mod=9}} any seed between 0 and 8 would be valid and {{seed=6}} would
> 'place' the request with the 7th of 9 replicas, or more realistically the 3rd
> of 3 replicas.
> * seed-plus-mod placement automatically adjusts when the number of replicas
> changes i.e. (seed=2,mod=6) would be 3rd-of-6 or 2nd-of-4 or 2nd-of-3 or
> 1st-of-2 placement.
> {quote}
> selected code areas of interest:
> * The HttpShardHandler's prepDistributed method calls the
> HttpShardHandlerFactory's getReplicaListTransformer method.
> **
> https://github.com/apache/lucene-solr/blob/releases/lucene-solr/7.7.0/solr/core/src/java/org/apache/solr/handler/component/HttpShardHandler.java#L294
> **
> https://github.com/apache/lucene-solr/blob/releases/lucene-solr/7.7.0/solr/core/src/java/org/apache/solr/handler/component/HttpShardHandlerFactory.java#L438-L484
> * The simplest replica list transformer is a shuffling one. Additionally and
> optionally node preference rules may be applied.
> **
> https://github.com/apache/lucene-solr/blob/releases/lucene-solr/7.7.0/solr/core/src/java/org/apache/solr/handler/component/ShufflingReplicaListTransformer.java
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