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https://issues.apache.org/jira/browse/SOLR-15718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17434854#comment-17434854
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Christine Poerschke commented on SOLR-15718:
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{quote}... was introduced to do rolling upgrades from 8.5 to 8.6 (which lets
8.6 fall back to Java-serialization). ... 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. ...
{quote}
So if I understand this right then direct rolling upgrades from 8.5 to 9.x
would not be possible anymore, correct?
The [https://solr.apache.org/guide/8_10/solr-upgrade-notes.html#solr-8-5] entry
has a _"Keep in mind that this will be removed in future version of Solr."_
reminder, perhaps the Solr9 upgrade notes could 'close the loop' by mentioning
the removal also.
> Remove backcompat feature solr.useUnsafeOverseerResponse
> --------------------------------------------------------
>
> Key: SOLR-15718
> URL: https://issues.apache.org/jira/browse/SOLR-15718
> Project: Solr
> Issue Type: Sub-task
> Reporter: Jan Høydahl
> Assignee: Jan Høydahl
> Priority: Major
> Time Spent: 10m
> 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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