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https://issues.apache.org/jira/browse/SOLR-15718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17502381#comment-17502381
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Mike Drob commented on SOLR-15718:
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I think this is fine for 9.0 because we have a requirement for rolling upgrades
to at least start from 8.7 : see
https://nightlies.apache.org/solr/draft-guides/solr-reference-guide-antora/solr/10_0/upgrade-notes/major-changes-in-solr-9.html#rolling-upgrades
> Remove backcompat feature solr.useUnsafeOverseerResponse
> --------------------------------------------------------
>
> Key: SOLR-15718
> URL: https://issues.apache.org/jira/browse/SOLR-15718
> Project: Solr
> Issue Type: Bug
> Reporter: Jan Høydahl
> Assignee: Jan Høydahl
> Priority: Blocker
> Fix For: main (10.0)
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> In SOLR-14095 (Solr 8.5) a system property {{solr.useUnsafeOverseerResponse}}
> was introduced to do rolling upgrades from 8.5 to 8.6 (which lets 8.6 fall
> back to Java-serialization).
> See [https://github.com/apache/solr/search?q=useUnsafeOverseerResponse]
> When upgrading to 9.0 I suppose we tell people to first upgrade to 8.11, so
> in 9.0 we don't need this. [~tflobbe] agree?
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