Hello @qu1etstorm    The Logs FileNotFoundException & YouAreDeadException are typically observed after the Cause, so worth checking the Logs before the concerned 2 Exception. TheYouAreDeadException is thrown by the Master when a RegionServer reports and is already being processed as Dead. This can happen when aRegionServer loses its session but didn't figure it yet. So, Best to check with respect to the RegionServer ZNode Session tracking in the Logs, while comparing the time at when the Master detected the RegionServer Ephemeral ZNode as being removed. Typically, JVMPause are the most likely cause.    - Smarak ... View more