Hello @Senthilnath TM ,
Thanks for the question and using MS Q&A platform.
Only critical security fixes will be patched on HDInsight clusters.
Does this need a manual intervention for OS Patching & Updates?
Yes, you need to manual perform common tasks on your cluster such as installing OS patches, OS security updates, and rebooting nodes.
As the document: Configure the OS patching schedule for Linux-based HDInsight clusters clearly mentions
Running clusters aren't auto-patched. Customers must use script actions or other mechanisms to patch a running cluster.
Hope this will help. Please let us know if any further queries.
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