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https://issues.apache.org/jira/browse/NIFI-11162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17772627#comment-17772627
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Michael W Moser commented on NIFI-11162:
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NiFi 2.0 will be able to support rolling upgrade of a cluster. See NIFI-12016.
> When upgrading, rolling restart nodes to avoid service interruption
> -------------------------------------------------------------------
>
> Key: NIFI-11162
> URL: https://issues.apache.org/jira/browse/NIFI-11162
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Affects Versions: 1.20.0
> Reporter: macdoor615
> Priority: Major
>
> The current upgrade requires stopping all nodes at the same time, upgrading
> all nodes, and then restarting all nodes, which will interrupt the service.
> It is recommended to support rolling upgrades, each node is stopped,
> upgraded, and restarted one by one to avoid service interruption.
> Before all nodes are upgraded, the early version of the inter-connection
> protocol is adopted between nodes. When all nodes are upgraded, the
> inter-connection protocol will upgrade to the current version.
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