Loading Class Manager, Pattern and 'dependency view' from service map hangs


Description

Load the 'dependency view' from service map hangs first time after clearing browsing cache and history. The issue is reproducible for all users and browsers.



Cause

Logs show the following:

2020-01-08 13:41:41 (587) http-29 WARNING *** WARNING *** GlideRequestManager:Running request: /api/now/bsm/icons, run time: 21, waiters: 10
2020-01-08 13:41:41 (587) http-29 WARNING *** WARNING *** GlideRequestManager:Request ignored: /angular.do?sysparm_type=get_partial&name=sn_number_spinner.xml
2020-01-08 13:41:41 (590) http-31 WARNING *** WARNING *** GlideRequestManager:Running request: /api/now/bsm/icons, run time: 24, waiters: 10
2020-01-08 13:41:41 (590) http-31 WARNING *** WARNING *** GlideRequestManager:Request ignored: /angular.do?sysparm_type=get_partial&name=sn_checklist.xml
2020-01-08 13:41:41 (591) http-14 WARNING *** WARNING *** GlideRequestManager:Running request: /api/now/bsm/icons, run time: 24, waiters: 10
2020-01-08 13:41:41 (591) http-14 WARNING *** WARNING *** GlideRequestManager:Request ignored: /api/now/bsm/lastmap
2020-01-08 13:41:41 (711) http-40 WARNING *** WARNING *** GlideRequestManager:Running request: /api/now/bsm/icons, run time: 145, waiters: 10
2020-01-08 13:41:41 (712) http-40 WARNING *** WARNING *** GlideRequestManager:Request ignored: /api/now/table/######_script?sysparm_fields=sys_id,name&sysparm_query=ORDERBYname%5Eactive%3Dtrue
2020-01-08 13:41:41 (713) http-23 WARNING *** WARNING *** GlideRequestManager:Running request: /api/now/bsm/icons, run time: 147, waiters: 10
2020-01-08 13:41:41 (713) http-23 WARNING *** WARNING *** GlideRequestManager:Request ignored: /api/now/table/######_filter?sysparm_fields=name,filter&sysparm_query=ORDERBYDESCname%5Euser%3D6816f79cc0a8016401c5a33be04be441
2020-01-08 13:41:41 (718) http-18 WARNING *** WARNING *** GlideRequestManager:Running request: /api/now/bsm/icons, run time: 152, waiters: 10
2020-01-08 13:41:41 (718) http-18 WARNING *** WARNING *** GlideRequestManager:Request ignored: /api/now/bsm/filters

Resolution

Additional Information

Similar issue observed in "chat" is mentioned in KB0793128,

https://support.servicenow.com/kb_view.do?sysparm_article=KB0683895

Similar issue observed in dependency view map, class manager, pattern.