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https://issues.apache.org/jira/browse/SOLR-14613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17201378#comment-17201378
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Ilan Ginzburg commented on SOLR-14613:
--------------------------------------

[~noble.paul] could we change {{setClusterProperty(String propertyName, Object 
propertyValue)}} in {{ClusterProperties}} to replace the existing property 
value with the passed one, or do we really need this "partial" update behavior? 
(where existing Json in {{clusterprops.json}} for {{propertyName}} is merged 
rather than replaced with the new Json of {{propertyValue}})

If we can't change the existing method, I suggest the added one to have a 
consistent signature, i.e. define *{{update(String propertyName, Object 
propertyValue)}}* rather than {{update(MapWriter obj, String... path)}}. This 
will make {{ClusterAPI}} easier to read and move the configuration management 
implementation details to {{ClusterProperties}} where they belong.

> Provide a clean API for pluggable replica assignment implementations
> --------------------------------------------------------------------
>
>                 Key: SOLR-14613
>                 URL: https://issues.apache.org/jira/browse/SOLR-14613
>             Project: Solr
>          Issue Type: Improvement
>          Components: AutoScaling
>            Reporter: Andrzej Bialecki
>            Assignee: Ilan Ginzburg
>            Priority: Major
>          Time Spent: 41h
>  Remaining Estimate: 0h
>
> As described in SIP-8 the current autoscaling Policy implementation has 
> several limitations that make it difficult to use for very large clusters and 
> very large collections. SIP-8 also mentions the possible migration path by 
> providing alternative implementations of the placement strategies that are 
> less complex but more efficient in these very large environments.
> We should review the existing APIs that the current autoscaling engine uses 
> ({{SolrCloudManager}} , {{AssignStrategy}} , {{Suggester}} and related 
> interfaces) to see if they provide a sufficient and minimal API for plugging 
> in alternative autoscaling placement strategies, and if necessary refactor 
> the existing APIs.
> Since these APIs are internal it should be possible to do this without 
> breaking back-compat.



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