Hi,   Recently in one of our critical Cloudera CDP 7.1.7_p1044 cluster we could see that Impala is getting hanged intermittently and whenever Impala session are getting hanged no one was being able to run even Show databases and all Impala sessions are getting hanged. While restarting the Impala Catalog service the issue gets resolved but again it reappears after 5-6 hours or may be after 1 days as there is no fixed time. We checked the Impala catalog log and found the following errors when it is in hung state:   "Error getting policies; Received NULL response!!. secure Mode=true, user=impala/pc1133.aaa.abc.com@corp.xxx.COM (auth: KERBEROS), service Name=hive"   Also while checking the Ranger errors we got the following error :   "RangerAdminRESTClient.java:167] Error getting policies; Received NULL response!!"   Also getting error in Hive Server 2 logs:   "Error occurred during processing of message. SSL Handshake Exception: Remote host terminated the handshake"   Any help will be highly appreciated.   Thanks. ... View more