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https://issues.apache.org/jira/browse/SOLR-8696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15159413#comment-15159413
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Scott Blum commented on SOLR-8696:
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Thanks. Way beyond the scope of this ticket, I was just curious about it. It
seemed a little silly on the face of it, because solr already has to tolerate
long periods of things being marked ACTIVE in cluster state that aren't really
up, since a node can crash and take a long time to recover. I feel like all a
recovering node really needs to do is verify that all the cores it owns are in
the correct state immediately before publishing its live node entry. We could
save a lot of unnecessary overseer ops here on node restart.
> Start the Overseer before actions that need the overseer on init and when
> reconnecting after zk expiration and improve init logic.
> ----------------------------------------------------------------------------------------------------------------------------------
>
> 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
> Assignee: Mark Miller
> Labels: patch, performance, solrcloud, startup
> Attachments: SOLR-8696.patch, 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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