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https://issues.apache.org/jira/browse/SOLR-6261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14077051#comment-14077051
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Mark Miller commented on SOLR-6261:
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Ah, the original pull request info in the first JIRA comment has links that are
all kept up to date as you make changes.
Did not realize. I'll commit this change shortly.
> Run ZK watch event callbacks in parallel to the event thread
> ------------------------------------------------------------
>
> Key: SOLR-6261
> URL: https://issues.apache.org/jira/browse/SOLR-6261
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Affects Versions: 4.9
> Reporter: Ramkumar Aiyengar
> Assignee: Mark Miller
> Priority: Minor
>
> Currently checking for leadership (due to the leader's ephemeral node going
> away) happens in ZK's event thread. If there are many cores and all of them
> are due leadership, then they would have to serially go through the two-way
> sync and leadership takeover.
> For tens of cores, this could mean 30-40s without leadership before the last
> in the list even gets to start the leadership process. If the leadership
> process happens in a separate thread, then the cores could all take over in
> parallel.
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