[KAFKA-5198] RocksDbStore#openIterators should be synchronized, since it is accessed from multiple threads

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.11.0.0
• Component/s: streams
• Assignee: Colin McCabe
• Reporter: Colin McCabe
• Created: 08/May/17 21:53
• Updated: 13/May/17 00:04
• Resolved: 13/May/17 00:04

Description

Currently, RocksDBIterator#close accesses RocksDbStore#openIterators without taking the RocksDbStore lock. The only lock RocksDBIterator#close holds is a lock on the iterator object, which does not help here. So RocksDbStore#openIterators should be made synchronized. Otherwise there is undefined behavior, including ConcurrentModificationExceptions.

Issue Links

• links to: GitHub Pull Request #3000