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https://issues.apache.org/jira/browse/SOLR-12641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cao Manh Dat resolved SOLR-12641.
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Resolution: Fixed
Assignee: Cao Manh Dat
> Support rolling updates when jira/http2 get merged
> --------------------------------------------------
>
> Key: SOLR-12641
> URL: https://issues.apache.org/jira/browse/SOLR-12641
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Cao Manh Dat
> Assignee: Cao Manh Dat
> Priority: Major
>
> Right now, Http2SolrClient can't connect to old Solr nodes, this seems an
> issue of Jetty HTTP client
> (https://github.com/eclipse/jetty.project/issues/1308). To support rolling
> updates, this problem must be solved.
> After discussing with other guys, we agree that rolling updates can be no
> support in Solr 8.0 with *default settings* since it is a major release.
> Users who want to do rolling updates must follow these two steps.
> * Upgrade nodes will start with a *special flag* to indicate that they will
> use HTTP/1.1 as the protocol for intercommunication.
> * When all nodes are in version 8.0, restart nodes and remove above *special
> flag*, therefore nodes will communicate with others using HTTP/2 from
> thereafter.
> This issue will aim to introduce that *special flag*. Note that by default
> HTTP/2 still the *default protocol* for Solr 8.0.
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