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If using Replicaset use wiredTiger. #143

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Apr 18, 2019
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If using Replicaset use wiredTiger. #143

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9 changes: 7 additions & 2 deletions mgo.go
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Original file line number Diff line number Diff line change
Expand Up @@ -271,7 +271,7 @@ func (inst *MgoInstance) run() error {
mgoargs = append(mgoargs, "--nojournal")
}
if version.Compare(storageEngineMongoVersion) >= 0 {
storageEngine := mongoStorageEngine()
storageEngine := mongoStorageEngine(inst.EnableReplicaSet)
if storageEngine != "" {
mgoargs = append(mgoargs, "--storageEngine", storageEngine)
}
Expand Down Expand Up @@ -351,18 +351,23 @@ func (inst *MgoInstance) run() error {
return nil
}

func mongoStorageEngine() string {
func mongoStorageEngine(replicaset bool) string {
storageEngine := os.Getenv("JUJU_MONGO_STORAGE_ENGINE")
if storageEngine != "" {
return storageEngine
}
switch runtime.GOARCH {
case "amd64":
if replicaset {
// Use 'wiredTiger' unless explicitly requested to use a
// different backend. mmapv1 is generally available, but
// doesn't support things like server-side transactions, and
// also isn't our production backend.
return "wiredTiger"
} else {
// We use mmapv1 in the test suite as it can be 3-4x faster in many tests.
return "mmapv1"
}
}
return "" // use the default
}
Expand Down