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feat: add randomized election timeout jitter (Gap 8.8)

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Add RandomizedElectionTimeout() method to RaftNode returning TimeSpan in
[ElectionTimeoutMinMs, ElectionTimeoutMaxMs) using TotalMilliseconds (not
.Milliseconds component) to prevent synchronized elections after partitions.
Make Random injectable for deterministic testing. Fix SendHeartbeatAsync stub
in NatsRaftTransport and test-local transport implementations to satisfy the
IRaftTransport interface added in Gap 8.7.
This commit is contained in:
Joseph Doherty
2026-02-25 08:30:38 -05:00
parent 5a62100397
commit ae4cc6d613
7 changed files with 355 additions and 3 deletions
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6
tests/NATS.Server.Tests/Raft/RaftLogReplicationTests.cs
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@@ -555,6 +555,9 @@ public class RaftLogReplicationTests
public Task SendTimeoutNowAsync(string leaderId, string targetId, ulong term, CancellationToken ct)
=> Task.CompletedTask;
public Task SendHeartbeatAsync(string leaderId, IReadOnlyList<string> followerIds, int term, Action<string> onAck, CancellationToken ct)
=> Task.CompletedTask;
}
// -- Helper transport that succeeds for first follower, fails for rest --
@@ -596,5 +599,8 @@ public class RaftLogReplicationTests
public Task SendTimeoutNowAsync(string leaderId, string targetId, ulong term, CancellationToken ct)
=> Task.CompletedTask;
public Task SendHeartbeatAsync(string leaderId, IReadOnlyList<string> followerIds, int term, Action<string> onAck, CancellationToken ct)
=> Task.CompletedTask;
}
}