@Jalender were you able to find out what was eating your resource manager heap? We are also experiencing the same thing but not daily. and our cluster is very much smaller than yours (only 29 data nodes) and when it is idle, RM heap should more or less be under 30% only. but on some days, we get very high RM heap when cluster is totally idle. also checked "yarn.resourcemanager.state-store.max-completed-applications" and it just means value is less than or equal to "yarn.resourcemanager.max-completed-applications" which is default at 10,000.
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