Summary

Sometimes, the sidebar does not load properly while browsing an issue. No icon appears on the sidebar and message "Unable to render element due to an error" appears on the top of the sidebar. Users have to refresh few times to get the sidebar loaded properly.

Steps to Reproduce

N/A as this happens intermittently for some customers

Expected Results

The issue details and sidebar are displayed without any error

Actual Results

Occasionally the sidebar shows "Unable to render element due to an error" while the below exception is thrown in the atlassian-jira.log file:

2017-02-14 15:57:28,689 http-nio-8080-exec-202 ERROR anonymous 6x15350x1 oclbhd 0:0:0:0:0:0:0:1 /browse/DESK-4095 [c.a.p.webresource.assembler.DefaultWebResourceAssembler] Error generating bigpipe content for 'sidebar-id': Deadline exceeded
java.lang.RuntimeException: Deadline exceeded
	at com.atlassian.plugin.webresource.bigpipe.QueueFutureCompletionService.forceCompleteAll(QueueFutureCompletionService.java:62)
	at com.atlassian.plugin.webresource.bigpipe.BigPipe.forceCompleteAll(BigPipe.java:33)
...

Workaround

1. Navigate to http:<JIRA-base-URL>/secure/admin/SiteDarkFeatures!Default.jspa to get to the Dark Features page.
2. Enable the dark feature com.atlassian.jira.config.BIG_PIPE_KILLSWITCH.