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https://issues.apache.org/jira/browse/SOLR-17559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18090379#comment-18090379
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David Smiley commented on SOLR-17559:
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The PR here improves immutability... but the PRS aspect remains a mutable
aspect and is IMO out of scope. If that is to be improved, I think it'd be its
own issue.
> DocCollection should be fully immutable.
> ----------------------------------------
>
> Key: SOLR-17559
> URL: https://issues.apache.org/jira/browse/SOLR-17559
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud, SolrJ
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Minor
> Labels: newdev, pull-request-available
> Fix For: 10.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> DocCollection (a collection's SolrCloud state) has a number of accessors that
> return mutable data structures. The worst offender is getActiveSlicesArr,
> returning an array. To reduce the risk of accidental changes, any state
> exposure should be immutable.
> See this
> [comment|https://issues.apache.org/jira/browse/SOLR-12723?focusedCommentId=17897805&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17897805]
> for more context.
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