Fix: mesos-go imports

def/task.go

@@ -4,7 +4,7 @@ import (
 	"bitbucket.org/sunybingcloud/elektron/constants"
 	"bitbucket.org/sunybingcloud/elektron/utilities/offerUtils"
 	"encoding/json"
-	mesos "github.com/mesos/mesos-go/mesosproto"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
 	"github.com/pkg/errors"
 	"os"
 )

def/taskUtils.go

@@ -1,7 +1,7 @@
 package def
 
 import (
-	"github.com/mdesenfants/gokmeans"
+	"github.com/mash/gokmeans"
 	"log"
 	"sort"
 )

scheduler.go

@@ -8,8 +8,8 @@ import (
 	"flag"
 	"fmt"
 	"github.com/golang/protobuf/proto"
-	mesos "github.com/mesos/mesos-go/mesosproto"
-	sched "github.com/mesos/mesos-go/scheduler"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
 	"log"
 	"os"
 	"os/signal"

schedulers/MaxGreedyMins.go

@@ -5,8 +5,8 @@ import (
 	"bitbucket.org/sunybingcloud/elektron/utilities/mesosUtils"
 	"bitbucket.org/sunybingcloud/elektron/utilities/offerUtils"
 	"fmt"
-	mesos "github.com/mesos/mesos-go/mesosproto"
-	sched "github.com/mesos/mesos-go/scheduler"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
 	"log"
 	"math/rand"
 )

schedulers/MaxMin.go

@@ -5,8 +5,8 @@ import (
 	"bitbucket.org/sunybingcloud/elektron/utilities/mesosUtils"
 	"bitbucket.org/sunybingcloud/elektron/utilities/offerUtils"
 	"fmt"
-	mesos "github.com/mesos/mesos-go/mesosproto"
-	sched "github.com/mesos/mesos-go/scheduler"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
 	"log"
 	"math/rand"
 )

schedulers/base.go

@@ -6,9 +6,9 @@ import (
 	"bytes"
 	"fmt"
 	"github.com/golang/protobuf/proto"
-	mesos "github.com/mesos/mesos-go/mesosproto"
-	"github.com/mesos/mesos-go/mesosutil"
-	sched "github.com/mesos/mesos-go/scheduler"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	"github.com/mesos/mesos-go/api/v0/mesosutil"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
 	"log"
 	"sync"
 	"time"

schedulers/bin-packing.go

@@ -5,8 +5,8 @@ import (
 	"bitbucket.org/sunybingcloud/elektron/utilities/mesosUtils"
 	"bitbucket.org/sunybingcloud/elektron/utilities/offerUtils"
 	"fmt"
-	mesos "github.com/mesos/mesos-go/mesosproto"
-	sched "github.com/mesos/mesos-go/scheduler"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
 	"log"
 	"math/rand"
 )

schedulers/binPackSortedWattsSortedOffers.go

@@ -0,0 +1,145 @@
+package schedulers
+
+import (
+	"bitbucket.org/sunybingcloud/electron/def"
+	elecLogDef "bitbucket.org/sunybingcloud/electron/logging/def"
+	"bitbucket.org/sunybingcloud/electron/utilities/mesosUtils"
+	"bitbucket.org/sunybingcloud/electron/utilities/offerUtils"
+	"bytes"
+	"fmt"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
+	"log"
+	"math/rand"
+	"sort"
+)
+
+// Decides if to take an offer or not
+func (s *BinPackSortedWattsSortedOffers) takeOffer(spc SchedPolicyContext, offer *mesos.Offer, task def.Task,
+	totalCPU, totalRAM, totalWatts float64) bool {
+	baseSchedRef := spc.(*baseScheduler)
+	offerCPU, offerRAM, offerWatts := offerUtils.OfferAgg(offer)
+
+	//TODO: Insert watts calculation here instead of taking them as a parameter
+	wattsConsideration, err := def.WattsToConsider(task, baseSchedRef.classMapWatts, offer)
+	if err != nil {
+		// Error in determining wattsConsideration
+		log.Fatal(err)
+	}
+	if (offerCPU >= (totalCPU + task.CPU)) && (offerRAM >= (totalRAM + task.RAM)) &&
+		(!baseSchedRef.wattsAsAResource || (offerWatts >= (totalWatts + wattsConsideration))) {
+		return true
+	}
+	return false
+}
+
+type BinPackSortedWattsSortedOffers struct {
+	SchedPolicyState
+}
+
+func (s *BinPackSortedWattsSortedOffers) ConsumeOffers(spc SchedPolicyContext, driver sched.SchedulerDriver, offers []*mesos.Offer) {
+	fmt.Println("BPSWSO scheduling...")
+	baseSchedRef := spc.(*baseScheduler)
+	def.SortTasks(baseSchedRef.tasks, def.SortByWatts)
+	baseSchedRef.LogOffersReceived(offers)
+
+	// Sorting the offers
+	sort.Sort(offerUtils.OffersSorter(offers))
+
+	// Printing the sorted offers and the corresponding CPU resource availability
+	buffer := bytes.Buffer{}
+	buffer.WriteString(fmt.Sprint("Sorted Offers:\n"))
+	for i := 0; i < len(offers); i++ {
+		offer := offers[i]
+		offerUtils.UpdateEnvironment(offer)
+		offerCPU, _, _ := offerUtils.OfferAgg(offer)
+		buffer.WriteString(fmt.Sprintf("Offer[%s].CPU = %f\n", offer.GetHostname(), offerCPU))
+	}
+	baseSchedRef.Log(elecLogDef.GENERAL, buffer.String())
+
+	for _, offer := range offers {
+		select {
+		case <-baseSchedRef.Shutdown:
+			baseSchedRef.LogNoPendingTasksDeclineOffers(offer)
+			driver.DeclineOffer(offer.Id, mesosUtils.LongFilter)
+			baseSchedRef.LogNumberOfRunningTasks()
+			continue
+		default:
+		}
+
+		tasks := []*mesos.TaskInfo{}
+
+		offerTaken := false
+		totalWatts := 0.0
+		totalCPU := 0.0
+		totalRAM := 0.0
+		for i := 0; i < len(baseSchedRef.tasks); i++ {
+			task := baseSchedRef.tasks[i]
+			wattsConsideration, err := def.WattsToConsider(task, baseSchedRef.classMapWatts, offer)
+			if err != nil {
+				// Error in determining wattsConsideration
+				log.Fatal(err)
+			}
+
+			// Don't take offer if it doesn't match our task's host requirement
+			if offerUtils.HostMismatch(*offer.Hostname, task.Host) {
+				continue
+			}
+
+			for *task.Instances > 0 {
+				// Does the task fit
+				if s.takeOffer(spc, offer, task, totalCPU, totalRAM, totalWatts) {
+
+					offerTaken = true
+					totalWatts += wattsConsideration
+					totalCPU += task.CPU
+					totalRAM += task.RAM
+					baseSchedRef.LogCoLocatedTasks(offer.GetSlaveId().GoString())
+					taskToSchedule := baseSchedRef.newTask(offer, task)
+					tasks = append(tasks, taskToSchedule)
+
+					baseSchedRef.LogSchedTrace(taskToSchedule, offer)
+					*task.Instances--
+
+					if *task.Instances <= 0 {
+						// All instances of task have been scheduled, remove it
+						baseSchedRef.tasks = append(baseSchedRef.tasks[:i],
+							baseSchedRef.tasks[i+1:]...)
+
+						if len(baseSchedRef.tasks) <= 0 {
+							baseSchedRef.LogTerminateScheduler()
+							close(baseSchedRef.Shutdown)
+						}
+					}
+				} else {
+					break // Continue on to next offer
+				}
+			}
+		}
+
+		if offerTaken {
+			baseSchedRef.LogTaskStarting(nil, offer)
+			driver.LaunchTasks([]*mesos.OfferID{offer.Id}, tasks, mesosUtils.DefaultFilter)
+		} else {
+
+			// If there was no match for the task
+			cpus, mem, watts := offerUtils.OfferAgg(offer)
+			baseSchedRef.LogInsufficientResourcesDeclineOffer(offer, cpus, mem, watts)
+			driver.DeclineOffer(offer.Id, mesosUtils.DefaultFilter)
+		}
+	}
+
+	// Switch scheduling policy only if feature enabled from CLI
+	if baseSchedRef.schedPolSwitchEnabled {
+		// Switching to a random scheduling policy.
+		// TODO: Switch based on some criteria.
+		index := rand.Intn(len(SchedPolicies))
+		for _, v := range SchedPolicies {
+			if index == 0 {
+				spc.SwitchSchedPol(v)
+				break
+			}
+			index--
+		}
+	}
+}

schedulers/bottomHeavy.go

@@ -0,0 +1,266 @@
+package schedulers
+
+import (
+	"bitbucket.org/sunybingcloud/electron/constants"
+	"bitbucket.org/sunybingcloud/electron/def"
+	elecLogDef "bitbucket.org/sunybingcloud/electron/logging/def"
+	"bitbucket.org/sunybingcloud/electron/utilities/mesosUtils"
+	"bitbucket.org/sunybingcloud/electron/utilities/offerUtils"
+	"bytes"
+	"fmt"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
+	"log"
+	"math/rand"
+)
+
+/*
+Tasks are categorized into small and large tasks based on watts requirements.
+All the large tasks are packed into offers from agents belonging to power classes A and B, using Bin-Packing.
+All the small tasks are spread among offers from agents belonging to power class C and D, using First-Fit.
+
+Bin-Packing has the most effect when co-scheduling of tasks is increased. Large tasks typically utilize more resources and hence,
+co-scheduling them has a great impact on the total power utilization.
+*/
+
+func (s *BottomHeavy) takeOfferBinPack(spc SchedPolicyContext, offer *mesos.Offer, totalCPU, totalRAM, totalWatts,
+	wattsToConsider float64, task def.Task) bool {
+	baseSchedRef := spc.(*baseScheduler)
+	offerCPU, offerRAM, offerWatts := offerUtils.OfferAgg(offer)
+
+	//TODO: Insert watts calculation here instead of taking them as a parameter
+	if (!baseSchedRef.wattsAsAResource || (offerWatts >= (totalWatts + wattsToConsider))) &&
+		(offerCPU >= (totalCPU + task.CPU)) &&
+		(offerRAM >= (totalRAM + task.RAM)) {
+		return true
+	}
+	return false
+
+}
+
+func (s *BottomHeavy) takeOfferFirstFit(spc SchedPolicyContext, offer *mesos.Offer,
+	wattsConsideration float64, task def.Task) bool {
+	baseSchedRef := spc.(*baseScheduler)
+	offerCPU, offerRAM, offerWatts := offerUtils.OfferAgg(offer)
+
+	//TODO: Insert watts calculation here instead of taking them as a parameter
+	if (!baseSchedRef.wattsAsAResource || (offerWatts >= wattsConsideration)) &&
+		(offerCPU >= task.CPU) && (offerRAM >= task.RAM) {
+		return true
+	}
+	return false
+}
+
+type BottomHeavy struct {
+	SchedPolicyState
+	smallTasks, largeTasks []def.Task
+}
+
+// Shut down scheduler if no more tasks to schedule
+func (s *BottomHeavy) shutDownIfNecessary(spc SchedPolicyContext) {
+	baseSchedRef := spc.(*baseScheduler)
+	if len(s.smallTasks) <= 0 && len(s.largeTasks) <= 0 {
+		baseSchedRef.LogTerminateScheduler()
+		close(baseSchedRef.Shutdown)
+	}
+}
+
+// create TaskInfo and log scheduling trace
+func (s *BottomHeavy) createTaskInfoAndLogSchedTrace(spc SchedPolicyContext, offer *mesos.Offer,
+	task def.Task) *mesos.TaskInfo {
+	baseSchedRef := spc.(*baseScheduler)
+	baseSchedRef.LogCoLocatedTasks(offer.GetSlaveId().GoString())
+	taskToSchedule := baseSchedRef.newTask(offer, task)
+
+	baseSchedRef.LogSchedTrace(taskToSchedule, offer)
+	*task.Instances--
+	return taskToSchedule
+}
+
+// Using BinPacking to pack large tasks into the given offers.
+func (s *BottomHeavy) pack(spc SchedPolicyContext, offers []*mesos.Offer, driver sched.SchedulerDriver) {
+	baseSchedRef := spc.(*baseScheduler)
+	for _, offer := range offers {
+		select {
+		case <-baseSchedRef.Shutdown:
+			baseSchedRef.LogNoPendingTasksDeclineOffers(offer)
+			driver.DeclineOffer(offer.Id, mesosUtils.LongFilter)
+			baseSchedRef.LogNumberOfRunningTasks()
+			continue
+		default:
+		}
+
+		tasks := []*mesos.TaskInfo{}
+		totalWatts := 0.0
+		totalCPU := 0.0
+		totalRAM := 0.0
+		offerTaken := false
+		for i := 0; i < len(s.largeTasks); i++ {
+			task := s.largeTasks[i]
+			wattsConsideration, err := def.WattsToConsider(task, baseSchedRef.classMapWatts, offer)
+			if err != nil {
+				// Error in determining wattsConsideration
+				log.Fatal(err)
+			}
+
+			for *task.Instances > 0 {
+				// Does the task fit
+				// OR lazy evaluation. If ignore watts is set to true, second statement won't
+				// be evaluated.
+				if s.takeOfferBinPack(spc, offer, totalCPU, totalRAM, totalWatts,
+					wattsConsideration, task) {
+					offerTaken = true
+					totalWatts += wattsConsideration
+					totalCPU += task.CPU
+					totalRAM += task.RAM
+					tasks = append(tasks, s.createTaskInfoAndLogSchedTrace(spc, offer, task))
+
+					if *task.Instances <= 0 {
+						// All instances of task have been scheduled, remove it
+						s.largeTasks = append(s.largeTasks[:i], s.largeTasks[i+1:]...)
+						s.shutDownIfNecessary(spc)
+					}
+				} else {
+					break // Continue on to next task
+				}
+			}
+		}
+
+		if offerTaken {
+			baseSchedRef.LogTaskStarting(nil, offer)
+			driver.LaunchTasks([]*mesos.OfferID{offer.Id}, tasks, mesosUtils.DefaultFilter)
+		} else {
+			// If there was no match for the task
+			cpus, mem, watts := offerUtils.OfferAgg(offer)
+			baseSchedRef.LogInsufficientResourcesDeclineOffer(offer, cpus, mem, watts)
+			driver.DeclineOffer(offer.Id, mesosUtils.DefaultFilter)
+		}
+	}
+}
+
+// Using First-Fit to spread small tasks among the given offers.
+func (s *BottomHeavy) spread(spc SchedPolicyContext, offers []*mesos.Offer, driver sched.SchedulerDriver) {
+	baseSchedRef := spc.(*baseScheduler)
+	for _, offer := range offers {
+		select {
+		case <-baseSchedRef.Shutdown:
+			baseSchedRef.LogNoPendingTasksDeclineOffers(offer)
+			driver.DeclineOffer(offer.Id, mesosUtils.LongFilter)
+			baseSchedRef.LogNumberOfRunningTasks()
+			continue
+		default:
+		}
+
+		tasks := []*mesos.TaskInfo{}
+		taken := false
+		for i := 0; i < len(s.smallTasks); i++ {
+			task := s.smallTasks[i]
+			wattsConsideration, err := def.WattsToConsider(task, baseSchedRef.classMapWatts, offer)
+			if err != nil {
+				// Error in determining wattsConsideration
+				log.Fatal(err)
+			}
+
+			// Decision to take the offer or not
+			if s.takeOfferFirstFit(spc, offer, wattsConsideration, task) {
+				taken = true
+				tasks = append(tasks, s.createTaskInfoAndLogSchedTrace(spc, offer, task))
+				baseSchedRef.LogTaskStarting(&s.smallTasks[i], offer)
+				driver.LaunchTasks([]*mesos.OfferID{offer.Id}, tasks, mesosUtils.DefaultFilter)
+
+				if *task.Instances <= 0 {
+					// All instances of task have been scheduled, remove it
+					s.smallTasks = append(s.smallTasks[:i], s.smallTasks[i+1:]...)
+					s.shutDownIfNecessary(spc)
+				}
+				break // Offer taken, move on
+			}
+		}
+
+		if !taken {
+			// If there was no match for the task
+			cpus, mem, watts := offerUtils.OfferAgg(offer)
+			baseSchedRef.LogInsufficientResourcesDeclineOffer(offer, cpus, mem, watts)
+			driver.DeclineOffer(offer.Id, mesosUtils.DefaultFilter)
+		}
+	}
+}
+
+func (s *BottomHeavy) ConsumeOffers(spc SchedPolicyContext, driver sched.SchedulerDriver, offers []*mesos.Offer) {
+	fmt.Println("BottomHeavy scheduling...")
+	baseSchedRef := spc.(*baseScheduler)
+	baseSchedRef.LogOffersReceived(offers)
+	// Sorting tasks based on Watts
+	def.SortTasks(baseSchedRef.tasks, def.SortByWatts)
+	// Classification done based on MMPU watts requirements, into 2 clusters.
+	classifiedTasks := def.ClassifyTasks(baseSchedRef.tasks, 2)
+	// Separating small tasks from large tasks.
+	s.smallTasks = classifiedTasks[0].Tasks
+	s.largeTasks = classifiedTasks[1].Tasks
+
+	// We need to separate the offers into
+	// offers from ClassA and ClassB and offers from ClassC and ClassD.
+	// Nodes in ClassA and ClassB will be packed with the large tasks.
+	// Small tasks will be spread out among the nodes in ClassC and ClassD.
+	offersHeavyPowerClasses := []*mesos.Offer{}
+	offersLightPowerClasses := []*mesos.Offer{}
+
+	for _, offer := range offers {
+		offerUtils.UpdateEnvironment(offer)
+		select {
+		case <-baseSchedRef.Shutdown:
+			baseSchedRef.LogNoPendingTasksDeclineOffers(offer)
+			driver.DeclineOffer(offer.Id, mesosUtils.LongFilter)
+			baseSchedRef.LogNumberOfRunningTasks()
+			continue
+		default:
+		}
+
+		if _, ok := constants.PowerClasses["A"][*offer.Hostname]; ok {
+			offersHeavyPowerClasses = append(offersHeavyPowerClasses, offer)
+		}
+		if _, ok := constants.PowerClasses["B"][*offer.Hostname]; ok {
+			offersHeavyPowerClasses = append(offersHeavyPowerClasses, offer)
+		}
+		if _, ok := constants.PowerClasses["C"][*offer.Hostname]; ok {
+			offersLightPowerClasses = append(offersLightPowerClasses, offer)
+		}
+		if _, ok := constants.PowerClasses["D"][*offer.Hostname]; ok {
+			offersLightPowerClasses = append(offersLightPowerClasses, offer)
+		}
+
+	}
+
+	buffer := bytes.Buffer{}
+	buffer.WriteString(fmt.Sprintln("Packing Large tasks into ClassAB offers:"))
+	for _, o := range offersHeavyPowerClasses {
+		buffer.WriteString(fmt.Sprintln(*o.Hostname))
+
+	}
+	baseSchedRef.Log(elecLogDef.GENERAL, buffer.String())
+	buffer.Reset()
+	// Packing tasks into offersHeavyPowerClasses
+	s.pack(spc, offersHeavyPowerClasses, driver)
+
+	buffer.WriteString(fmt.Sprintln("Packing Small tasks among ClassCD offers:"))
+	for _, o := range offersLightPowerClasses {
+		buffer.WriteString(*o.Hostname)
+	}
+	baseSchedRef.Log(elecLogDef.GENERAL, buffer.String())
+	// Spreading tasks among offersLightPowerClasses
+	s.spread(spc, offersLightPowerClasses, driver)
+
+	// Switch scheduling policy only if feature enabled from CLI
+	if baseSchedRef.schedPolSwitchEnabled {
+		// Switching to a random scheduling policy.
+		// TODO: Switch based on some criteria.
+		index := rand.Intn(len(SchedPolicies))
+		for _, v := range SchedPolicies {
+			if index == 0 {
+				spc.SwitchSchedPol(v)
+				break
+			}
+			index--
+		}
+	}
+}

schedulers/electronScheduler.go

@@ -3,8 +3,8 @@ package schedulers
 import (
 	"bitbucket.org/sunybingcloud/elektron/def"
 	elecLogDef "bitbucket.org/sunybingcloud/elektron/logging/def"
-	mesos "github.com/mesos/mesos-go/mesosproto"
-	sched "github.com/mesos/mesos-go/scheduler"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
 )
 
 // Implements mesos scheduler.

schedulers/first-fit.go

@@ -5,8 +5,8 @@ import (
 	"bitbucket.org/sunybingcloud/elektron/utilities/mesosUtils"
 	"bitbucket.org/sunybingcloud/elektron/utilities/offerUtils"
 	"fmt"
-	mesos "github.com/mesos/mesos-go/mesosproto"
-	sched "github.com/mesos/mesos-go/scheduler"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
 	"math/rand"
 )
 

schedulers/firstfitSortedOffers.go

@@ -0,0 +1,136 @@
+package schedulers
+
+import (
+	"bitbucket.org/sunybingcloud/electron/def"
+	elecLogDef "bitbucket.org/sunybingcloud/electron/logging/def"
+	"bitbucket.org/sunybingcloud/electron/utilities/mesosUtils"
+	"bitbucket.org/sunybingcloud/electron/utilities/offerUtils"
+	"bytes"
+	"fmt"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
+	"log"
+	"math/rand"
+	"sort"
+)
+
+// Decides if to take an offer or not
+func (s *FirstFitSortedOffers) takeOffer(spc SchedPolicyContext, offer *mesos.Offer, task def.Task) bool {
+
+	baseSchedRef := spc.(*baseScheduler)
+	cpus, mem, watts := offerUtils.OfferAgg(offer)
+
+	//TODO: Insert watts calculation here instead of taking them as a parameter
+
+	wattsConsideration, err := def.WattsToConsider(task, baseSchedRef.classMapWatts, offer)
+	if err != nil {
+		// Error in determining wattsConsideration
+		log.Fatal(err)
+	}
+	if cpus >= task.CPU && mem >= task.RAM && (!baseSchedRef.wattsAsAResource || watts >= wattsConsideration) {
+		return true
+	}
+
+	return false
+}
+
+// electronScheduler implements the Scheduler interface
+type FirstFitSortedOffers struct {
+	SchedPolicyState
+}
+
+func (s *FirstFitSortedOffers) ConsumeOffers(spc SchedPolicyContext, driver sched.SchedulerDriver,
+	offers []*mesos.Offer) {
+	fmt.Println("FFSO scheduling...")
+	baseSchedRef := spc.(*baseScheduler)
+	baseSchedRef.LogOffersReceived(offers)
+
+	// Sorting the offers
+	sort.Sort(offerUtils.OffersSorter(offers))
+
+	// Printing the sorted offers and the corresponding CPU resource availability
+	buffer := bytes.Buffer{}
+	buffer.WriteString(fmt.Sprintln("Sorted Offers:"))
+	for i := 0; i < len(offers); i++ {
+		offer := offers[i]
+		offerUtils.UpdateEnvironment(offer)
+		offerCPU, _, _ := offerUtils.OfferAgg(offer)
+		buffer.WriteString(fmt.Sprintf("Offer[%s].CPU = %f\n", offer.GetHostname(), offerCPU))
+	}
+	baseSchedRef.Log(elecLogDef.GENERAL, buffer.String())
+
+	for _, offer := range offers {
+		select {
+		case <-baseSchedRef.Shutdown:
+			baseSchedRef.LogNoPendingTasksDeclineOffers(offer)
+			driver.DeclineOffer(offer.Id, mesosUtils.LongFilter)
+			baseSchedRef.LogNumberOfRunningTasks()
+			continue
+		default:
+		}
+
+		tasks := []*mesos.TaskInfo{}
+
+		// First fit strategy
+
+		offerTaken := false
+		for i := 0; i < len(baseSchedRef.tasks); i++ {
+			task := baseSchedRef.tasks[i]
+
+			// Don't take offer if it doesn't match our task's host requirement
+			if offerUtils.HostMismatch(*offer.Hostname, task.Host) {
+				continue
+			}
+
+			// Decision to take the offer or not
+			if s.takeOffer(spc, offer, task) {
+
+				baseSchedRef.LogCoLocatedTasks(offer.GetSlaveId().GoString())
+
+				taskToSchedule := baseSchedRef.newTask(offer, task)
+				tasks = append(tasks, taskToSchedule)
+
+				baseSchedRef.LogTaskStarting(&task, offer)
+				driver.LaunchTasks([]*mesos.OfferID{offer.Id}, tasks, mesosUtils.DefaultFilter)
+
+				offerTaken = true
+
+				baseSchedRef.LogSchedTrace(taskToSchedule, offer)
+				*task.Instances--
+
+				if *task.Instances <= 0 {
+					// All instances of task have been scheduled, remove it
+					baseSchedRef.tasks[i] = baseSchedRef.tasks[len(baseSchedRef.tasks)-1]
+					baseSchedRef.tasks = baseSchedRef.tasks[:len(baseSchedRef.tasks)-1]
+
+					if len(baseSchedRef.tasks) <= 0 {
+						baseSchedRef.LogTerminateScheduler()
+						close(baseSchedRef.Shutdown)
+					}
+				}
+				break // Offer taken, move on
+			}
+		}
+
+		// If there was no match for the task
+		if !offerTaken {
+			cpus, mem, watts := offerUtils.OfferAgg(offer)
+			baseSchedRef.LogInsufficientResourcesDeclineOffer(offer, cpus, mem, watts)
+			driver.DeclineOffer(offer.Id, mesosUtils.DefaultFilter)
+		}
+	}
+
+	// Switch scheduling policy only if feature enabled from CLI
+	if baseSchedRef.schedPolSwitchEnabled {
+		// Switching to a random scheduling policy.
+		// TODO: Switch based on some criteria.
+		index := rand.Intn(len(SchedPolicies))
+		for _, v := range SchedPolicies {
+			if index == 0 {
+				spc.SwitchSchedPol(v)
+				break
+			}
+			index--
+		}
+	}
+}

schedulers/firstfitSortedWattsSortedOffers.go

@@ -0,0 +1,134 @@
+package schedulers
+
+import (
+	"bitbucket.org/sunybingcloud/electron/def"
+	elecLogDef "bitbucket.org/sunybingcloud/electron/logging/def"
+	"bitbucket.org/sunybingcloud/electron/utilities/mesosUtils"
+	"bitbucket.org/sunybingcloud/electron/utilities/offerUtils"
+	"bytes"
+	"fmt"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
+	"log"
+	"math/rand"
+	"sort"
+)
+
+// Decides if to take an offer or not
+func (s *FirstFitSortedWattsSortedOffers) takeOffer(spc SchedPolicyContext, offer *mesos.Offer, task def.Task) bool {
+	baseSchedRef := spc.(*baseScheduler)
+	cpus, mem, watts := offerUtils.OfferAgg(offer)
+
+	//TODO: Insert watts calculation here instead of taking them as a parameter
+
+	wattsConsideration, err := def.WattsToConsider(task, baseSchedRef.classMapWatts, offer)
+	if err != nil {
+		// Error in determining wattsConsideration
+		log.Fatal(err)
+	}
+	if cpus >= task.CPU && mem >= task.RAM && (!baseSchedRef.wattsAsAResource || watts >= wattsConsideration) {
+		return true
+	}
+
+	return false
+}
+
+// electronScheduler implements the Scheduler interface
+type FirstFitSortedWattsSortedOffers struct {
+	SchedPolicyState
+}
+
+func (s *FirstFitSortedWattsSortedOffers) ConsumeOffers(spc SchedPolicyContext, driver sched.SchedulerDriver,
+	offers []*mesos.Offer) {
+	fmt.Println("FFSWSO scheduling...")
+	baseSchedRef := spc.(*baseScheduler)
+	def.SortTasks(baseSchedRef.tasks, def.SortByWatts)
+	baseSchedRef.LogOffersReceived(offers)
+	// Sorting the offers
+	sort.Sort(offerUtils.OffersSorter(offers))
+
+	// Printing the sorted offers and the corresponding CPU resource availability
+	buffer := bytes.Buffer{}
+	buffer.WriteString(fmt.Sprintln("Sorted Offers:"))
+	for i := 0; i < len(offers); i++ {
+		offer := offers[i]
+		offerUtils.UpdateEnvironment(offer)
+		offerCPU, _, _ := offerUtils.OfferAgg(offer)
+		buffer.WriteString(fmt.Sprintf("Offer[%s].CPU = %f\n", offer.GetHostname(), offerCPU))
+	}
+	baseSchedRef.Log(elecLogDef.GENERAL, buffer.String())
+
+	for _, offer := range offers {
+		select {
+		case <-baseSchedRef.Shutdown:
+			baseSchedRef.LogNoPendingTasksDeclineOffers(offer)
+			driver.DeclineOffer(offer.Id, mesosUtils.LongFilter)
+			baseSchedRef.LogNumberOfRunningTasks()
+			continue
+		default:
+		}
+
+		tasks := []*mesos.TaskInfo{}
+
+		// First fit strategy
+
+		offerTaken := false
+		for i := 0; i < len(baseSchedRef.tasks); i++ {
+			task := baseSchedRef.tasks[i]
+
+			// Don't take offer if it doesn't match our task's host requirement
+			if offerUtils.HostMismatch(*offer.Hostname, task.Host) {
+				continue
+			}
+
+			// Decision to take the offer or not
+			if s.takeOffer(spc, offer, task) {
+
+				baseSchedRef.LogCoLocatedTasks(offer.GetSlaveId().GoString())
+
+				taskToSchedule := baseSchedRef.newTask(offer, task)
+				tasks = append(tasks, taskToSchedule)
+
+				baseSchedRef.LogTaskStarting(&task, offer)
+				driver.LaunchTasks([]*mesos.OfferID{offer.Id}, tasks, mesosUtils.DefaultFilter)
+
+				offerTaken = true
+
+				baseSchedRef.LogSchedTrace(taskToSchedule, offer)
+				*task.Instances--
+
+				if *task.Instances <= 0 {
+					// All instances of task have been scheduled, remove it
+					baseSchedRef.tasks = append(baseSchedRef.tasks[:i],
+						baseSchedRef.tasks[i+1:]...)
+
+					if len(baseSchedRef.tasks) <= 0 {
+						baseSchedRef.LogTerminateScheduler()
+						close(baseSchedRef.Shutdown)
+					}
+				}
+				break // Offer taken, move on
+			}
+		}
+
+		// If there was no match for the task
+		if !offerTaken {
+			cpus, mem, watts := offerUtils.OfferAgg(offer)
+			baseSchedRef.LogInsufficientResourcesDeclineOffer(offer, cpus, mem, watts)
+			driver.DeclineOffer(offer.Id, mesosUtils.DefaultFilter)
+		}
+	}
+
+	if baseSchedRef.schedPolSwitchEnabled {
+		// Switching to a random scheduling policy.
+		// TODO: Switch based on some criteria.
+		index := rand.Intn(len(SchedPolicies))
+		for _, v := range SchedPolicies {
+			if index == 0 {
+				spc.SwitchSchedPol(v)
+				break
+			}
+			index--
+		}
+	}
+}

schedulers/firstfitsortedwatts.go

@@ -0,0 +1,122 @@
+package schedulers
+
+import (
+	"bitbucket.org/sunybingcloud/electron/def"
+	"bitbucket.org/sunybingcloud/electron/utilities/mesosUtils"
+	"bitbucket.org/sunybingcloud/electron/utilities/offerUtils"
+	"fmt"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
+	"log"
+	"math/rand"
+)
+
+// Decides if to take an offer or not
+func (s *FirstFitSortedWatts) takeOffer(spc SchedPolicyContext, offer *mesos.Offer, task def.Task) bool {
+
+	baseSchedRef := spc.(*baseScheduler)
+	cpus, mem, watts := offerUtils.OfferAgg(offer)
+
+	//TODO: Insert watts calculation here instead of taking them as a parameter
+
+	wattsConsideration, err := def.WattsToConsider(task, baseSchedRef.classMapWatts, offer)
+	if err != nil {
+		// Error in determining wattsConsideration
+		log.Fatal(err)
+	}
+	if cpus >= task.CPU && mem >= task.RAM && (!baseSchedRef.wattsAsAResource || watts >= wattsConsideration) {
+		return true
+	}
+
+	return false
+}
+
+// electronScheduler implements the Scheduler interface
+type FirstFitSortedWatts struct {
+	SchedPolicyState
+}
+
+func (s *FirstFitSortedWatts) ConsumeOffers(spc SchedPolicyContext, driver sched.SchedulerDriver,
+	offers []*mesos.Offer) {
+	fmt.Println("FFSW scheduling...")
+	baseSchedRef := spc.(*baseScheduler)
+	def.SortTasks(baseSchedRef.tasks, def.SortByWatts)
+	baseSchedRef.LogOffersReceived(offers)
+
+	for _, offer := range offers {
+		offerUtils.UpdateEnvironment(offer)
+		select {
+		case <-baseSchedRef.Shutdown:
+			baseSchedRef.LogNoPendingTasksDeclineOffers(offer)
+			driver.DeclineOffer(offer.Id, mesosUtils.LongFilter)
+			baseSchedRef.LogNumberOfRunningTasks()
+			continue
+		default:
+		}
+
+		tasks := []*mesos.TaskInfo{}
+
+		// First fit strategy
+
+		offerTaken := false
+		for i := 0; i < len(baseSchedRef.tasks); i++ {
+			task := baseSchedRef.tasks[i]
+
+			// Don't take offer if it doesn't match our task's host requirement
+			if offerUtils.HostMismatch(*offer.Hostname, task.Host) {
+				continue
+			}
+
+			// Decision to take the offer or not
+			if s.takeOffer(spc, offer, task) {
+
+				baseSchedRef.LogCoLocatedTasks(offer.GetSlaveId().GoString())
+
+				taskToSchedule := baseSchedRef.newTask(offer, task)
+				tasks = append(tasks, taskToSchedule)
+
+				baseSchedRef.LogTaskStarting(&task, offer)
+				driver.LaunchTasks([]*mesos.OfferID{offer.Id}, tasks, mesosUtils.DefaultFilter)
+
+				offerTaken = true
+
+				baseSchedRef.LogSchedTrace(taskToSchedule, offer)
+				*task.Instances--
+
+				if *task.Instances <= 0 {
+					// All instances of task have been scheduled, remove it
+					baseSchedRef.tasks = append(baseSchedRef.tasks[:i],
+						baseSchedRef.tasks[i+1:]...)
+
+					if len(baseSchedRef.tasks) <= 0 {
+						baseSchedRef.LogTerminateScheduler()
+						close(baseSchedRef.Shutdown)
+					}
+				}
+				break // Offer taken, move on
+			}
+		}
+
+		// If there was no match for the task
+		if !offerTaken {
+			cpus, mem, watts := offerUtils.OfferAgg(offer)
+			baseSchedRef.LogInsufficientResourcesDeclineOffer(offer, cpus, mem, watts)
+			driver.DeclineOffer(offer.Id, mesosUtils.DefaultFilter)
+		}
+
+	}
+
+	// Switch scheduling policy only if feature enabled from CLI
+	if baseSchedRef.schedPolSwitchEnabled {
+		// Switching to a random scheduling policy.
+		// TODO: Switch based on some criteria.
+		index := rand.Intn(len(SchedPolicies))
+		for _, v := range SchedPolicies {
+			if index == 0 {
+				spc.SwitchSchedPol(v)
+				break
+			}
+			index--
+		}
+	}
+}

schedulers/schedPolicy.go

@@ -1,8 +1,8 @@
 package schedulers
 
 import (
-	mesos "github.com/mesos/mesos-go/mesosproto"
-	sched "github.com/mesos/mesos-go/scheduler"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
 )
 
 type SchedPolicyContext interface {

schedulers/states.go

@@ -2,7 +2,7 @@ package schedulers
 
 import (
 	"fmt"
-	mesos "github.com/mesos/mesos-go/mesosproto"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
 )
 
 // NameFor returns the string name for a TaskState.

schedulers/store.go

@@ -1,7 +1,7 @@
 package schedulers
 
 import (
-	sched "github.com/mesos/mesos-go/scheduler"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
 )
 
 // Names of different scheduling policies.

schedulers/topHeavy.go

@@ -0,0 +1,262 @@
+package schedulers
+
+import (
+	"bitbucket.org/sunybingcloud/electron/constants"
+	"bitbucket.org/sunybingcloud/electron/def"
+	elecLogDef "bitbucket.org/sunybingcloud/electron/logging/def"
+	"bitbucket.org/sunybingcloud/electron/utilities/mesosUtils"
+	"bitbucket.org/sunybingcloud/electron/utilities/offerUtils"
+	"bytes"
+	"fmt"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
+	sched "github.com/mesos/mesos-go/api/v0/scheduler"
+	"log"
+	"math/rand"
+)
+
+/*
+Tasks are categorized into small and large tasks based on the watts requirement.
+All the small tasks are packed into offers from agents belonging to power class C and power class D, using BinPacking.
+All the large tasks are spread among the offers from agents belonging to power class A and power class B, using FirstFit.
+
+This was done to give a little more room for the large tasks (power intensive) for execution and reduce the possibility of
+starvation of power intensive tasks.
+*/
+
+func (s *TopHeavy) takeOfferBinPack(spc SchedPolicyContext, offer *mesos.Offer, totalCPU, totalRAM, totalWatts,
+	wattsToConsider float64, task def.Task) bool {
+	baseSchedRef := spc.(*baseScheduler)
+	offerCPU, offerRAM, offerWatts := offerUtils.OfferAgg(offer)
+
+	//TODO: Insert watts calculation here instead of taking them as a parameter
+	if (!baseSchedRef.wattsAsAResource || (offerWatts >= (totalWatts + wattsToConsider))) &&
+		(offerCPU >= (totalCPU + task.CPU)) &&
+		(offerRAM >= (totalRAM + task.RAM)) {
+		return true
+	}
+	return false
+}
+
+func (s *TopHeavy) takeOfferFirstFit(spc SchedPolicyContext, offer *mesos.Offer, wattsConsideration float64, task def.Task) bool {
+	baseSchedRef := spc.(*baseScheduler)
+	offerCPU, offerRAM, offerWatts := offerUtils.OfferAgg(offer)
+
+	//TODO: Insert watts calculation here instead of taking them as a parameter
+	if (!baseSchedRef.wattsAsAResource || (offerWatts >= wattsConsideration)) &&
+		(offerCPU >= task.CPU) && (offerRAM >= task.RAM) {
+		return true
+	}
+	return false
+}
+
+// electronScheduler implements the Scheduler interface
+type TopHeavy struct {
+	SchedPolicyState
+	smallTasks, largeTasks []def.Task
+}
+
+// Shut down scheduler if no more tasks to schedule
+func (s *TopHeavy) shutDownIfNecessary(spc SchedPolicyContext) {
+	baseSchedRef := spc.(*baseScheduler)
+	if len(s.smallTasks) <= 0 && len(s.largeTasks) <= 0 {
+		baseSchedRef.LogTerminateScheduler()
+		close(baseSchedRef.Shutdown)
+	}
+}
+
+// create TaskInfo and log scheduling trace
+func (s *TopHeavy) createTaskInfoAndLogSchedTrace(spc SchedPolicyContext, offer *mesos.Offer, task def.Task) *mesos.TaskInfo {
+	baseSchedRef := spc.(*baseScheduler)
+	baseSchedRef.LogCoLocatedTasks(offer.GetSlaveId().GoString())
+	taskToSchedule := baseSchedRef.newTask(offer, task)
+
+	baseSchedRef.LogSchedTrace(taskToSchedule, offer)
+	*task.Instances--
+	return taskToSchedule
+}
+
+// Using BinPacking to pack small tasks into this offer.
+func (s *TopHeavy) pack(spc SchedPolicyContext, offers []*mesos.Offer, driver sched.SchedulerDriver) {
+	baseSchedRef := spc.(*baseScheduler)
+	for _, offer := range offers {
+		select {
+		case <-baseSchedRef.Shutdown:
+			baseSchedRef.LogNoPendingTasksDeclineOffers(offer)
+			driver.DeclineOffer(offer.Id, mesosUtils.LongFilter)
+			baseSchedRef.LogNumberOfRunningTasks()
+			continue
+		default:
+		}
+
+		tasks := []*mesos.TaskInfo{}
+		totalWatts := 0.0
+		totalCPU := 0.0
+		totalRAM := 0.0
+		taken := false
+		for i := 0; i < len(s.smallTasks); i++ {
+			task := s.smallTasks[i]
+			wattsConsideration, err := def.WattsToConsider(task, baseSchedRef.classMapWatts, offer)
+			if err != nil {
+				// Error in determining wattsConsideration
+				log.Fatal(err)
+			}
+
+			for *task.Instances > 0 {
+				// Does the task fit
+				// OR lazy evaluation. If ignore watts is set to true, second statement won't
+				// be evaluated.
+				if s.takeOfferBinPack(spc, offer, totalCPU, totalRAM, totalWatts, wattsConsideration, task) {
+					taken = true
+					totalWatts += wattsConsideration
+					totalCPU += task.CPU
+					totalRAM += task.RAM
+					tasks = append(tasks, s.createTaskInfoAndLogSchedTrace(spc, offer, task))
+
+					if *task.Instances <= 0 {
+						// All instances of task have been scheduled, remove it
+						s.smallTasks = append(s.smallTasks[:i], s.smallTasks[i+1:]...)
+						s.shutDownIfNecessary(spc)
+					}
+				} else {
+					break // Continue on to next task
+				}
+			}
+		}
+
+		if taken {
+			baseSchedRef.LogTaskStarting(nil, offer)
+			driver.LaunchTasks([]*mesos.OfferID{offer.Id}, tasks, mesosUtils.DefaultFilter)
+		} else {
+			// If there was no match for the task
+			cpus, mem, watts := offerUtils.OfferAgg(offer)
+			baseSchedRef.LogInsufficientResourcesDeclineOffer(offer, cpus, mem, watts)
+			driver.DeclineOffer(offer.Id, mesosUtils.DefaultFilter)
+		}
+	}
+}
+
+// Using first fit to spread large tasks into these offers.
+func (s *TopHeavy) spread(spc SchedPolicyContext, offers []*mesos.Offer, driver sched.SchedulerDriver) {
+	baseSchedRef := spc.(*baseScheduler)
+	for _, offer := range offers {
+		select {
+		case <-baseSchedRef.Shutdown:
+			baseSchedRef.LogNoPendingTasksDeclineOffers(offer)
+			driver.DeclineOffer(offer.Id, mesosUtils.LongFilter)
+			baseSchedRef.LogNumberOfRunningTasks()
+			continue
+		default:
+		}
+
+		tasks := []*mesos.TaskInfo{}
+		offerTaken := false
+		for i := 0; i < len(s.largeTasks); i++ {
+			task := s.largeTasks[i]
+			wattsConsideration, err := def.WattsToConsider(task, baseSchedRef.classMapWatts, offer)
+			if err != nil {
+				// Error in determining wattsConsideration
+				log.Fatal(err)
+			}
+
+			// Decision to take the offer or not
+			if s.takeOfferFirstFit(spc, offer, wattsConsideration, task) {
+				offerTaken = true
+				tasks = append(tasks, s.createTaskInfoAndLogSchedTrace(spc, offer, task))
+				baseSchedRef.LogTaskStarting(&s.largeTasks[i], offer)
+				driver.LaunchTasks([]*mesos.OfferID{offer.Id}, tasks, mesosUtils.DefaultFilter)
+
+				if *task.Instances <= 0 {
+					// All instances of task have been scheduled, remove it
+					s.largeTasks = append(s.largeTasks[:i], s.largeTasks[i+1:]...)
+					s.shutDownIfNecessary(spc)
+				}
+				break // Offer taken, move on
+			}
+		}
+
+		if !offerTaken {
+			// If there was no match for the task
+			cpus, mem, watts := offerUtils.OfferAgg(offer)
+			baseSchedRef.LogInsufficientResourcesDeclineOffer(offer, cpus, mem, watts)
+			driver.DeclineOffer(offer.Id, mesosUtils.DefaultFilter)
+		}
+	}
+}
+
+func (s *TopHeavy) ConsumeOffers(spc SchedPolicyContext, driver sched.SchedulerDriver, offers []*mesos.Offer) {
+	fmt.Println("TopHeavy scheduling...")
+	baseSchedRef := spc.(*baseScheduler)
+	baseSchedRef.LogOffersReceived(offers)
+	// Sorting tasks based on Watts
+	def.SortTasks(baseSchedRef.tasks, def.SortByWatts)
+	// Classification done based on MMPU watts requirements, into 2 clusters.
+	classifiedTasks := def.ClassifyTasks(baseSchedRef.tasks, 2)
+	// Separating small tasks from large tasks.
+	s.smallTasks = classifiedTasks[0].Tasks
+	s.largeTasks = classifiedTasks[1].Tasks
+	baseSchedRef.LogOffersReceived(offers)
+
+	// We need to separate the offers into
+	// offers from ClassA and ClassB and offers from ClassC and ClassD.
+	// Offers from ClassA and ClassB would execute the large tasks.
+	// Offers from ClassC and ClassD would execute the small tasks.
+	offersHeavyPowerClasses := []*mesos.Offer{}
+	offersLightPowerClasses := []*mesos.Offer{}
+
+	for _, offer := range offers {
+		offerUtils.UpdateEnvironment(offer)
+		select {
+		case <-baseSchedRef.Shutdown:
+			baseSchedRef.LogNoPendingTasksDeclineOffers(offer)
+			driver.DeclineOffer(offer.Id, mesosUtils.LongFilter)
+			baseSchedRef.LogNumberOfRunningTasks()
+			continue
+		default:
+		}
+
+		if _, ok := constants.PowerClasses["A"][*offer.Hostname]; ok {
+			offersHeavyPowerClasses = append(offersHeavyPowerClasses, offer)
+		}
+		if _, ok := constants.PowerClasses["B"][*offer.Hostname]; ok {
+			offersHeavyPowerClasses = append(offersHeavyPowerClasses, offer)
+		}
+		if _, ok := constants.PowerClasses["C"][*offer.Hostname]; ok {
+			offersLightPowerClasses = append(offersLightPowerClasses, offer)
+		}
+		if _, ok := constants.PowerClasses["D"][*offer.Hostname]; ok {
+			offersLightPowerClasses = append(offersLightPowerClasses, offer)
+		}
+	}
+
+	buffer := bytes.Buffer{}
+	buffer.WriteString(fmt.Sprintln("Spreading Large tasks into ClassAB Offers:"))
+	for _, o := range offersHeavyPowerClasses {
+		buffer.WriteString(fmt.Sprintln(*o.Hostname))
+	}
+	baseSchedRef.Log(elecLogDef.GENERAL, buffer.String())
+	buffer.Reset()
+
+	buffer.WriteString(fmt.Sprintln("Packing Small tasks into ClassCD Offers:"))
+	for _, o := range offersLightPowerClasses {
+		buffer.WriteString(fmt.Sprintln(*o.Hostname))
+	}
+	baseSchedRef.Log(elecLogDef.GENERAL, buffer.String())
+
+	// Packing tasks into offersLightPowerClasses
+	s.pack(spc, offersLightPowerClasses, driver)
+	// Spreading tasks among offersHeavyPowerClasses
+	s.spread(spc, offersHeavyPowerClasses, driver)
+
+	if baseSchedRef.schedPolSwitchEnabled {
+		// Switching to a random scheduling policy.
+		// TODO: Switch based on some criteria.
+		index := rand.Intn(len(SchedPolicies))
+		for _, v := range SchedPolicies {
+			if index == 0 {
+				spc.SwitchSchedPol(v)
+				break
+			}
+			index--
+		}
+	}
+}

utilities/mesosUtils/mesosUtils.go

@@ -2,7 +2,7 @@ package mesosUtils
 
 import (
 	"github.com/golang/protobuf/proto"
-	mesos "github.com/mesos/mesos-go/mesosproto"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
 )
 
 var (

utilities/offerUtils/offerUtils.go

@@ -2,7 +2,7 @@ package offerUtils
 
 import (
 	"bitbucket.org/sunybingcloud/elektron/constants"
-	mesos "github.com/mesos/mesos-go/mesosproto"
+	mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
 	"log"
 	"strings"
 )