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https://issues.apache.org/jira/browse/SOLR-8696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15155888#comment-15155888
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Scott Blum commented on SOLR-8696:
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[[email protected]]
Yes, I get the breakpoint in OverseerCollectionMessageHandler#addReplica. I'm
trying to follow up on [~shalinmangar]'s request to add a wait loop at the end
of that method. But where I'm struggling is, I don't actually understand where
and how the ZK cluster state ever gets updated in legacy mode. Who updates the
ZK cluster state as a result of OverseerCollectionMessageHandler#addReplica?
> Optimize overseer + startup
> ---------------------------
>
> Key: SOLR-8696
> URL: https://issues.apache.org/jira/browse/SOLR-8696
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Affects Versions: 5.4.1
> Reporter: Scott Blum
> Labels: patch, performance, solrcloud, startup
> Attachments: SOLR-8696.patch
>
>
> ZkController.publishAndWaitForDownStates() occurs before overseer election.
> That means if there is currently no overseer, there is ironically no one to
> actually service the down state changes it's waiting on. This particularly
> affects a single-node cluster such as you might run locally for development.
> Additionally, we're doing an unnecessary ZkStateReader forced refresh on all
> Overseer operations. This isn't necessary because ZkStateReader keeps itself
> up to date.
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