Posted On: Oct 8, 2020
Amazon EMR now supports a spread placement group strategy for clusters with multiple master nodes. You can now launch master nodes across separate underlying hardware to reduce the risk of simultaneous failures that might occur when instances share the same racks. Earlier, master nodes were placed within the same subnet without any placement strategies.
To use this feature, you need to attach the placement group managed policy to the EMR role, and launch the cluster with the placement-group-configs parameter.