diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..99eace8
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,6 @@
+1.4.0 (unreleased)
+
+* Moved to Thrift 0.12.0 code generator and go library.
+* `aurora.ACTIVE_STATES`, `aurora.SLAVE_ASSIGNED_STATES`, `aurora.LIVE_STATES`, `aurora.TERMINAL_STATES`, `aurora.ACTIVE_JOB_UPDATE_STATES`, `aurora.AWAITNG_PULSE_JOB_UPDATE_STATES` are all now generated as a slices.
+* Please use `realis.ActiveStates`, `realis.SlaveAssignedStates`,`realis.LiveStates`, `realis.TerminalStates`, `realis.ActiveJobUpdateStates`, `realis.AwaitingPulseJobUpdateStates` in their places when map representations are needed.
+* `GetInstanceIds(key *aurora.JobKey, states map[aurora.ScheduleStatus]bool) (map[int32]bool, error)` has changed signature to ` GetInstanceIds(key *aurora.JobKey, states []aurora.ScheduleStatus) ([]int32, error)`
diff --git a/job.go b/job.go
index e743ad2..9edf40a 100644
--- a/job.go
+++ b/job.go
@@ -88,9 +88,6 @@ func NewJob() Job {
 	taskConfig.Job = jobKey
 	taskConfig.Container = aurora.NewContainer()
 	taskConfig.Container.Mesos = aurora.NewMesosContainer()
-	taskConfig.MesosFetcherUris = make([]*aurora.MesosFetcherURI, 0)
-	taskConfig.Metadata = make([]*aurora.Metadata, 0)
-	taskConfig.Constraints = make([]*aurora.Constraint, 0)
 
 	// Resources
 	numCpus := aurora.NewResource()
diff --git a/updatejob.go b/updatejob.go
index 7dd5523..0319d8d 100644
--- a/updatejob.go
+++ b/updatejob.go
@@ -58,7 +58,6 @@ func NewDefaultUpdateJob(config *aurora.TaskConfig) *UpdateJob {
 	}
 
 	// Mirrors defaults set by Pystachio
-	req.Settings.UpdateOnlyTheseInstances = make([]*aurora.Range, 0)
 	req.Settings.UpdateGroupSize = 1
 	req.Settings.WaitForBatchCompletion = false
 	req.Settings.MinWaitInInstanceRunningMs = 45000
@@ -152,7 +151,6 @@ func NewUpdateSettings() *aurora.JobUpdateSettings {
 
 	us := new(aurora.JobUpdateSettings)
 	// Mirrors defaults set by Pystachio
-	us.UpdateOnlyTheseInstances = make([]*aurora.Range, 0)
 	us.UpdateGroupSize = 1
 	us.WaitForBatchCompletion = false
 	us.MinWaitInInstanceRunningMs = 45000