Merge pull request #3416 from hashicorp/issue_3409

Update raft library for windows snapshot fsync fixes. 

This fixes #3409

vendor/github.com/hashicorp/raft/Makefile

@@ -1,10 +1,13 @@
 DEPS = $(go list -f '{{range .TestImports}}{{.}} {{end}}' ./...)
 
 test:
-	go test -timeout=60s ./...
+	go test -timeout=60s .
 
 integ: test
-	INTEG_TESTS=yes go test -timeout=25s -run=Integ ./...
+	INTEG_TESTS=yes go test -timeout=25s -run=Integ .
+
+fuzz:
+	go test -timeout=300s ./fuzzy
 	
 deps:
 	go get -d -v ./...

vendor/github.com/hashicorp/raft/file_snapshot.go

@@ -12,6 +12,7 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+	"runtime"
 	"sort"
 	"strings"
 	"time"
@@ -406,7 +407,7 @@ func (s *FileSnapshotSink) Close() error {
 		return err
 	}
 
-	// fsync the parent directory, to sync directory edits to disk
+	if runtime.GOOS != "windows" { //skipping fsync for directory entry edits on Windows, only needed for *nix style file systems
 		parentFH, err := os.Open(s.parentDir)
 		defer parentFH.Close()
 		if err != nil {
@@ -418,6 +419,7 @@ func (s *FileSnapshotSink) Close() error {
 			s.logger.Printf("[ERR] snapshot: Failed syncing parent directory %v, error: %v", s.parentDir, err)
 			return err
 		}
+	}
 
 	// Reap any old snapshots
 	if err := s.store.ReapSnapshots(); err != nil {

vendor/github.com/hashicorp/raft/observer.go

@@ -24,6 +24,12 @@ type FilterFn func(o *Observation) bool
 
 // Observer describes what to do with a given observation.
 type Observer struct {
+	// numObserved and numDropped are performance counters for this observer.
+	// 64 bit types must be 64 bit aligned to use with atomic operations on
+	// 32 bit platforms, so keep them at the top of the struct.
+	numObserved uint64
+	numDropped  uint64
+
 	// channel receives observations.
 	channel chan Observation
 
@@ -37,10 +43,6 @@ type Observer struct {
 
 	// id is the ID of this observer in the Raft map.
 	id uint64
-
-	// numObserved and numDropped are performance counters for this observer.
-	numObserved uint64
-	numDropped  uint64
 }
 
 // NewObserver creates a new observer that can be registered

vendor/github.com/hashicorp/raft/state.go

@@ -42,6 +42,10 @@ func (s RaftState) String() string {
 // and provides an interface to set/get the variables in a
 // thread safe manner.
 type raftState struct {
+	// currentTerm commitIndex, lastApplied,  must be kept at the top of
+	// the struct so they're 64 bit aligned which is a requirement for
+	// atomic ops on 32 bit platforms.
+
 	// The current term, cache of StableStore
 	currentTerm uint64
 

vendor/vendor.json

@@ -57,7 +57,7 @@
 		{"checksumSHA1":"vt+P9D2yWDO3gdvdgCzwqunlhxU=","path":"github.com/hashicorp/logutils","revision":"0dc08b1671f34c4250ce212759ebd880f743d883","revisionTime":"2015-06-09T07:04:31Z"},
 		{"checksumSHA1":"ml0MTqOsKTrsqv/mZhy78Vz4SfA=","path":"github.com/hashicorp/memberlist","revision":"d6c1fb0b99c33d0a8e22acea9da9709b369b5d39","revisionTime":"2017-08-15T22:46:17Z"},
 		{"checksumSHA1":"qnlqWJYV81ENr61SZk9c65R1mDo=","path":"github.com/hashicorp/net-rpc-msgpackrpc","revision":"a14192a58a694c123d8fe5481d4a4727d6ae82f3","revisionTime":"2015-11-16T02:03:38Z"},
-		{"checksumSHA1":"5GHIYEtOr1rsHOZUac6RA/82d3I=","path":"github.com/hashicorp/raft","revision":"0a6e1b039ba3d8057e9f16c919d2afb813884f74","revisionTime":"2017-08-04T15:11:58Z","version":"library-v2-stage-one","versionExact":"library-v2-stage-one"},
+		{"checksumSHA1":"RVDP6/BNLtrGbyoiGU2GjTun9Kk=","path":"github.com/hashicorp/raft","revision":"2356637a1c1ffe894b753680363ad970480215aa","revisionTime":"2017-08-24T21:39:20Z","version":"library-v2-stage-one","versionExact":"library-v2-stage-one"},
 		{"checksumSHA1":"QAxukkv54/iIvLfsUP6IK4R0m/A=","path":"github.com/hashicorp/raft-boltdb","revision":"d1e82c1ec3f15ee991f7cc7ffd5b67ff6f5bbaee","revisionTime":"2015-02-01T20:08:39Z"},
 		{"checksumSHA1":"/oss17GO4hXGM7QnUdI3VzcAHzA=","comment":"v0.7.0-66-g6c4672d","path":"github.com/hashicorp/serf/coordinate","revision":"c2e4be24cdc9031eb0ad869c5d160775efdf7d7a","revisionTime":"2017-05-25T23:15:04Z"},
 		{"checksumSHA1":"3WPnGSL9ZK6EmkAE6tEW5SCxrd8=","comment":"v0.7.0-66-g6c4672d","path":"github.com/hashicorp/serf/serf","revision":"b84a66cc5575994cb672940d244a2404141688c0","revisionTime":"2017-08-17T21:22:02Z"},