[HADOOP-13500] Synchronizing iteration of Configuration properties object

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.4.0, 2.10.2, 3.2.3, 3.3.2
• Component/s: conf
• Labels: pull-request-available
• Assignee: Dhananjay Badaya
• Reporter: Jason Darrell Lowe
• Created: 16/Aug/16 19:49
• Updated: 04/Jan/22 22:42
• Resolved: 17/Dec/21 16:09

Description

It is possible to encounter a ConcurrentModificationException while trying to iterate a Configuration object. The iterator method tries to walk the underlying Property object without proper synchronization, so another thread simultaneously calling the set method can trigger it.

Issue Links

• is related to: YARN-8109 Resource Manager WebApps fails to start due to ConcurrentModificationException
• relates to: TEZ-3413 ConcurrentModificationException in HistoryEventTimelineConversion for AppLaunchedEvent
• links to: GitHub Pull Request #3775
• links to: GitHub Pull Request #3776