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https://issues.apache.org/jira/browse/SOLR-7056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17437687#comment-17437687
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Jan Høydahl commented on SOLR-7056:
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+1
Also cluster-level commands should be disabled, i.e. {{/api/cluster}}.
During a rolling upgrade, we'd likely also want to disable any form of
autoscaling actions that may be triggered (stuff in
{{org.apache.solr.cluster.events}}), so that people's custom plugins won't
start reacting to NODES_DOWN events, moving replicas around... But that's
likely a separate command.
> Disable Collections API during rolling upgrade
> ----------------------------------------------
>
> Key: SOLR-7056
> URL: https://issues.apache.org/jira/browse/SOLR-7056
> Project: Solr
> Issue Type: Sub-task
> Components: SolrCloud
> Environment:
> Reporter: Hrishikesh Gadre
> Priority: Major
>
> As per Mark,
> "bq. want to upgrade note a recommendation to not run collections api
> commands while doing the rolling upgrade
> The more I think about this, the more this makes sense in general, for any
> rolling upgrades. We should remove this java serialization, but I think
> creating or modifying a collection across versions is probably never a
> wonderful idea. We might want to add an easy way to enable / disable such
> API's even."
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