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https://issues.apache.org/jira/browse/SOLR-9014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15270829#comment-15270829
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Scott Blum commented on SOLR-9014:
----------------------------------
BTW, I'm surprised this was super tricky. There aren't really that many
callers. I count:
{code}
16 - solr-core
9 - solr-core-tests
2 - solr-test-framework
5 - solrj
1 - solrj-tests
{code}
> 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.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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