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https://issues.apache.org/jira/browse/SOLR-5991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13973420#comment-13973420
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Ryan Ernst commented on SOLR-5991:
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The problem there is imagine you are in a cloud service, and you are migrating
to new hosts. You don't want solrcloud to select a different host, that you
plan on taking down. 'quit' could work for this, but if you have 50 hosts, and
you bring up another 50, I would imagine quitting each of the old 50 hosts in
succession would cause some churn in decision making. You really want a way to
say "these new nodes are preferred".
> SolrCloud: Add API to move leader off a Solr instance
> -----------------------------------------------------
>
> Key: SOLR-5991
> URL: https://issues.apache.org/jira/browse/SOLR-5991
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.7.1
> Reporter: Rich Mayfield
>
> Common maintenance chores require restarting Solr instances.
> The process of a shutdown becomes a whole lot more reliable if we can
> proactively move any leadership roles off of the Solr instance we are going
> to shut down. The leadership election process then runs immediately.
> I am not sure what the semantics should be (either accomplishes the goal but
> one of these might be best):
> * A call to tell a core to give up leadership (thus the next replica is
> chosen)
> * A call to specify which core should become the leader
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