[RATIS-1396] Reduce lock contention in RaftServerImpl::replyPendingRequest

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.2.0
• Component/s: server
• Assignee: Tsz-wo Sze
• Reporter: Rajesh Balamohan
• Created: 23/Jun/20 06:28
• Updated: 16/Sep/21 16:27
• Resolved: 16/Sep/21 16:27

Description

https://github.com/apache/incubator-ratis/blob/master/ratis-server/src/main/java/org/apache/ratis/server/impl/RaftServerImpl.java#L1341

Can be easily refactored to acquire the lock only for leader, to reduce the lock contention.

Observed this in terasort.

Issue Links

• links to: GitHub Pull Request #494