[jira] [Commented] (SOLR-8696) Start the Overseer before actions that need the overseer on init and when reconnecting after zk expiration and improve init logic.

["Mark Miller (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-8696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15159086#comment-15159086 ] 

Mark Miller commented on SOLR-8696:
-----------------------------------

Need to remove the duplicate call to zkStateReader.createClusterStateWatchersAndUpdate();

> 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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