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https://issues.apache.org/jira/browse/SOLR-9014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15271658#comment-15271658
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ASF subversion and git services commented on SOLR-9014:
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Commit f5497a33e29d087dc0e87ccc697e85f5018d8702 in lucene-solr's branch 
refs/heads/master from [~shalinmangar]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=f5497a3 ]

SOLR-9014: Deprecate ClusterState.getCollections and introduce a new 
ClusterState.getCollectionsMap instead


> Deprecate and reduce usage of ClusterState methods which may make calls to ZK 
> via the lazy collection reference
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-9014
>                 URL: https://issues.apache.org/jira/browse/SOLR-9014
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>            Reporter: Shalin Shekhar Mangar
>             Fix For: 6.1, master
>
>         Attachments: SOLR-9014-deprecate-getCollections.patch, SOLR-9014.patch
>
>
> ClusterState has a bunch of methods such as getSlice and getReplica which 
> internally call getCollectionOrNull that ends up making a call to ZK via the 
> lazy collection reference. Many classes use these methods even though a 
> DocCollection object is available. In such cases, multiple redundant calls to 
> ZooKeeper can happen if the collection is not watched locally. This is 
> especially true for Overseer classes which operate on all collections.
> We should audit all usages of these methods and replace them with calls to 
> appropriate DocCollection methods.



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