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From "Cao Manh Dat (JIRA)" <>
Subject [jira] [Resolved] (SOLR-12641) Support rolling updates when jira/http2 get merged
Date Mon, 10 Sep 2018 08:17:00 GMT


Cao Manh Dat resolved SOLR-12641.
    Resolution: Fixed
      Assignee: Cao Manh Dat

> Support rolling updates when jira/http2 get merged
> --------------------------------------------------
>                 Key: SOLR-12641
>                 URL:
>             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 ( 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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