[AMQ-7021] DestinationMap access inside Abstract Region readwrite lock does not need sync

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 5.15.5, 5.16.0
• Component/s: Broker
• Assignee: Gary Tully
• Reporter: Gary Tully
• Created: 25/Jul/18 15:40
• Updated: 30/Jul/18 10:58
• Resolved: 26/Jul/18 09:44

Description

Using multiple virtual topic publishers, there is unnecessary serialisation via the destination map.

the read write lock introduced in AMQ-3454 is sufficient to guard access in this case and reads should operate in parallel.

with many thousand destinations lookup can be expensive and the serialisation becomes apparent.

Issue Links

• is related to: AMQ-3454 Contention on a mutex during a stress when using SimpleAuthenticationPlugin