Default raft protocol to version 3

command/agent/command.go

@@ -15,14 +15,14 @@ import (
 	"syscall"
 	"time"
 
-	"github.com/armon/go-metrics"
+	metrics "github.com/armon/go-metrics"
 	"github.com/armon/go-metrics/circonus"
 	"github.com/armon/go-metrics/datadog"
 	"github.com/armon/go-metrics/prometheus"
 	"github.com/hashicorp/consul/lib"
-	"github.com/hashicorp/go-checkpoint"
-	"github.com/hashicorp/go-discover"
-	"github.com/hashicorp/go-hclog"
+	checkpoint "github.com/hashicorp/go-checkpoint"
+	discover "github.com/hashicorp/go-discover"
+	hclog "github.com/hashicorp/go-hclog"
 	gsyslog "github.com/hashicorp/go-syslog"
 	"github.com/hashicorp/logutils"
 	"github.com/hashicorp/nomad/helper"
@@ -1197,7 +1197,7 @@ Server Options:
 
   -raft-protocol=<num>
     The Raft protocol version to use. Used for enabling certain Autopilot
-    features. Defaults to 2.
+    features. Defaults to 3.
 
   -retry-join=<address>
     Address of an agent to join at start time with retries enabled.

nomad/config.go

@@ -398,9 +398,9 @@ func DefaultConfig() *Config {
 	// Disable shutdown on removal
 	c.RaftConfig.ShutdownOnRemove = false
 
-	// Enable interoperability with new raft APIs, requires all servers
-	// to be on raft v1 or higher.
-	c.RaftConfig.ProtocolVersion = 2
+	// Enable interoperability with new raft APIs and autopilot features,
+	// requires all servers to be on raft v3 or higher.
+	c.RaftConfig.ProtocolVersion = 3
 
 	return c
 }

website/source/guides/operations/autopilot.html.md

@@ -14,7 +14,7 @@ servers, monitoring the state of the Raft cluster, and stable server introductio
 
 To enable Autopilot features (with the exception of dead server cleanup),
 the `raft_protocol` setting in the [server stanza](/docs/configuration/server.html)
-must be set to 3 on all servers. In Nomad 0.8 this setting defaults to 2; in Nomad 0.9 it will default to 3.
+must be set to 3 on all servers. In Nomad 0.9 this setting defaults to 2; in Nomad 0.10 it will default to 3.
 For more information, see the [Version Upgrade section](/guides/upgrade/upgrade-specific.html#raft-protocol-version-compatibility)
 on Raft Protocol versions.