[MESOS-9766] /__processes__ endpoint can hang.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.5.4, 1.6.3, 1.7.3, 1.8.1, 1.9.0
• Component/s: libprocess
• Labels: foundations
• Target Version/s: 1.5.4, 1.6.3, 1.7.3, 1.8.1, 1.9.0
• Sprint: Mesos Foundations: RI13 Sp 45
• Story Points: 3
• Assignee: Benjamin Mahler
• Reporter: Benjamin Mahler
• Created: 03/May/19 19:50
• Updated: 23/May/19 11:16
• Resolved: 06/May/19 22:07

Description

A user reported that the /__processes__ endpoint occasionally hangs.

Stack traces provided by alexr revealed that all the threads appeared to be idle waiting for events. After investigating the code, the issue was found to be possible when a process gets terminated after the /__processes__ route handler dispatches to it, thus dropping the dispatch and abandoning the future.