[KAFKA-8463] Fix redundant reassignment of tasks when leader worker leaves

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 2.3.0
• Fix Version/s: 2.3.0
• Component/s: connect
• Assignee: Konstantine Karantasis
• Reporter: Konstantine Karantasis
• Reviewer: Randall Hauch
• Created: 01/Jun/19 22:09
• Updated: 11/Jul/19 16:06
• Resolved: 02/Jun/19 17:24

Description

There's a bug in the computation of new assignment for connectors and tasks in IncrementalCooperativeAssignor that may lead to duplicate assignment. The existing assignments should always be considered because if the leader worker bounces there's no history of previous assignments. 

Issue Links

• links to: GitHub Pull Request #6859