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Target customers: all users. Features released: Check items for YARN and check items for clusters in the Running state are added to EMR Doctor. Check on YARN: EMR Doctor allows you to perform real-time checks on YARN based on the added check items. EMR Doctor detects risks in real time and provides suggestions and solutions for the risks. Check on clusters in the Running state: EMR Doctor allows you to perform real-time checks on clusters in the Running state based on the added check items. You can use the real-time check feature to detect risks such as data skew, long tails, insufficient resources for jobs, excessive use of job resources, and some common errors.