Make Raft groups quiet when idle #7195
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This patch adds the ability to make Raft groups quiescent, so
that leaders stop sending heartbeats after a long idle time.
It works as follows:
- When a leader detects a long idle time it sends a
Quiesce message to its followers, and stops sending
heartbeats.
- Upon receiving a Quiesce message, followers no longer
expect heartbeats from the leader, by stopping their
election timers.
- A leader or follower unquiesces upon receiving any kind
of request: a new proposal, append entries, vote
requests, and so on.
Potential advantages and uses cases:
- Fewer messages over the network and less ticking in
deployments with a large number of inactive Raft groups
- Read-only streams
Disadvantes:
- Failures may go unnoticed for a long time
(Could be avoided if Raft layer could be notified of
dropped connections?)
- The first request to a quiesced group may experience
higher latency should nodes find out that they need to
go through a new election efore proposal can be pushed forward.
This is a proof of concept, it's incomplete and meant for
experimentation only.
Signed-off-by: Daniele Sciascia <[email protected]>
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This patch adds the ability to make Raft groups quiescent, so that leaders stop sending heartbeats after a long idle time. It works as follows:
Potential advantages and uses cases:
Disadvantes:
This is a proof of concept, it's incomplete and meant for experimentation only.
Signed-off-by: Daniele Sciascia [email protected]