[KAFKA-10826] Ensure raft io thread wakes up after linger expiration

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Assignee: Jason Gustafson
• Reporter: Jason Gustafson
• Created: 08/Dec/20 20:12
• Updated: 09/Dec/20 21:34
• Resolved: 09/Dec/20 21:34

Description

When scheduling an append, we currently only wakeup the IO thread after the batch is ready to drain. If the IO thread is blocking in `poll()`, there is no guarantee that it will get woken up by a subsequent append. We need to ensure that the thread gets woken up at least once when the linger timer starts ticking so that the IO thread will be ready when the batch is ready to drain.

Issue Links

• links to: GitHub Pull Request #9716