Following is the listing of the Impala sessions from Impala daemon Web UI (Screen shot is attached to the issue) . It shows that there are 4 active sessions wherein 3 of the 4 sessions have actually expired. On a large deployment, it can show a lot of active sessions (with most of them as expired) thereby causing users to get concerned. Users need to be able to see non-expired sessions.
There are 4 active sessions.
<Keeping fewer columns for ease of understanding>
Session Type Start Time Last Accessed Expired Closed
HIVESERVER2 2016-08-29 15:40:36.515856000 2016-08-29 22:41:01 true false
HIVESERVER2 2016-08-27 17:41:37.347666000 2016-08-28 00:44:45 true false
BEESWAX 2016-08-30 15:40:58.809359000 2016-08-30 22:49:57 false false
HIVESERVER2 2016-08-27 17:40:21.933108000 2016-08-28 00:40:54 true false