tflobbe commented on a change in pull request #614:
URL: https://github.com/apache/solr/pull/614#discussion_r802321380
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File path: solr/solr-ref-guide/src/major-changes-in-solr-9.adoc
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@@ -53,7 +53,11 @@ SolrCloud doesn't support that but may sometime.
* SOLR-14702: All references to "master" and "slave" were replaced in the code
with "leader" and "follower".
This includes API calls for the replication handler and metrics.
-For rolling upgrades into 9.0, you need to be on Solr version 8.7 or greater.
Some metrics also changed, alerts and monitors on Solr KPIs that mention
"master" or "slave" will also now be "leader" and "follower"
+For rolling upgrades into 9.0, you need to be on Solr version 8.7 or greater.
Some metrics also changed, alerts and monitors on Solr KPIs that mention
"master" or "slave" will also now be "leader" and "follower"
+
+* SOLR-15965: Internode communication secured by PKI Authentication has
changed formats. To maintain compatability, you will need to either:
+** Upgrade the cluster to 8.11.2 or newer before proceeding to 9.0
Review comment:
I'm guessing we'll want 8.11.2 to default to `solr.pki.sendVersion=v1`
and `solr.pki.acceptVersions=v1,v2` to support rolling upgrades from versions
<= 8.11.1, right? if that's the case, even upgrading from 8.11.2 may require
setting `solr.pki.acceptVersions=v1,v2` unless the user has already upgraded to
v2 explicitly.
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