check hbase gc logs. if there is a GC pause that correlates with these log lines then you got your problem. While master/RS is in GC, it fails to send heatbeat to zookeeper and the zookeeper node expires. In that case you can increase zookeeper timeout and increase ticktime in zookeeper config. this is not directly related but do checkout: https://superuser.blog/hbase-dead-regionserver/
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