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https://issues.apache.org/jira/browse/SOLR-12641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608852#comment-16608852
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ASF subversion and git services commented on SOLR-12641:
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Commit afe88fb8b85eebc42b02c8bdd8fd54e70907d1e2 in lucene-solr's branch
refs/heads/jira/http2 from [~caomanhdat]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=afe88fb ]
SOLR-12641: Support rolling updates when jira/http2 get merged
> 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
> 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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