Fanatical Support for AWS
Product Guide

Patching Amazon EMR

Alternative Method

It is possible to manually patch cluster instances in-place using OS management access to the instances. This may be appropriate if an EMR cluster needs to remain provisioned for a recurring job, but security updates are critical. The EMR cluster should be replaced using the recommended method above as soon as a downtime window is available.

Note: Any new instances that are launched - either through scaling changes or self-healing - will apply outstanding patches at launch.