[CASSANDRA-3079] Allow the client request scheduler to throw Timeouts

• Type: Improvement
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Component/s: Legacy/CQL
• Assignee: Stu Hood
• Reporter: Stu Hood

Authors

Stu Hood

Reviewers

Michael Wu

• Created: 25/Aug/11 23:00
• Updated: 16/Apr/19 09:32
• Resolved: 26/Aug/11 03:54

Description

The RoundRobinScheduler prioritizes threads by allowing them to queue on a SynchronousQueue per scheduling bucket. These queues currently do not use timeouts, and we observed a cascading case where client retries caused the scheduler queues to fill such that latency was way above the client timeout.

Allowing the IRequestScheduler.queue method to throw a (per-call configurable) timeout, we can avoid this cascading.

Issue Links

• is related to: CASSANDRA-3096 Test RoundRobinScheduler timeouts
• relates to: CASSANDRA-2819 Split rpc timeout for read and write ops