[KAFKA-8620] Race condition in StreamThread state change

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.0
• Fix Version/s: 2.1.2, 2.2.2, 2.4.0, 2.3.1
• Component/s: streams
• Assignee: Boyang Chen
• Reporter: Boyang Chen
• Created: 01/Jul/19 22:17
• Updated: 15/Jul/19 23:13
• Resolved: 15/Jul/19 22:46

Description

In the call to `StreamThread.addRecordsToTasks` we don't have synchronization when we attempt to extract active tasks. If after one long poll in runOnce the application state changes to PENDING_SHUTDOWN, there is a potential close on TaskManager which erases the active tasks map, thus triggering NPE and bringing the thread state to a false shutdown.

Issue Links

• links to: GitHub Pull Request #7021