Enhancements made on Amazon EMR Cluster

You can now launch an EMR cluster with three master nodes and support high availability for HBase clusters on EMR. This is in addition to the support for high availability mode for YARN Resource Manager, HDFS Name Node, Spark, Hive, and Ganglia. Amazon EMR automatically fails over to a standby master node if the primary master node fails or if critical processes such as Resource Manager or Name Node crash.

https://aws.amazon.com/about-aws/whats-new/2019/05/amazon-emr-now-supports-multiple-master-nodes-to-enable-high-availability-for-hbase-clusters/

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