diff --git a/.travis.yml b/.travis.yml
index 9d47394..4913f13 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,7 @@ git:
 go: [1.13.x, 1.14.x]
 script:
   - go test -race -v -coverprofile=coverage.txt -covermode=atomic ./...
+  - go test -run=XXX -bench=. -loglevel=debug -v ./...
 services:
   - redis-server
 after_success:
diff --git a/.travis/benchcmp.sh b/.travis/benchcmp.sh
index 68dd088..e4f362c 100755
--- a/.travis/benchcmp.sh
+++ b/.travis/benchcmp.sh
@@ -6,11 +6,11 @@ if [ "${TRAVIS_PULL_REQUEST_BRANCH:-$TRAVIS_BRANCH}" != "master" ]; then
     # Benchmark master
     echo "Running benchmark tests on master branch"
     git checkout master && \
-    go test -run=XXX -bench=. -loglevel=debug ./... > master.txt && \
+    go test -run=XXX -bench=. -loglevel=debug -v ./... > master.txt && \
     # Benchmark feature branch
     echo "Running benchmark tests on feature branch"
     git checkout ${TRAVIS_COMMIT} && \
-    go test -run=XXX -bench=. -loglevel=debug ./... > feature.txt && \
+    go test -run=XXX -bench=. -loglevel=debug -v ./... > feature.txt && \
     go get -u golang.org/x/tools/cmd/benchcmp && \
     # compare two benchmarks
     benchcmp master.txt feature.txt;
diff --git a/benchmark_test.go b/benchmark_test.go
index d3338f2..e4a3211 100644
--- a/benchmark_test.go
+++ b/benchmark_test.go
@@ -92,8 +92,16 @@ func BenchmarkEndToEnd(b *testing.B) {
 		var wg sync.WaitGroup
 		wg.Add(count * 2)
 		handler := func(ctx context.Context, t *Task) error {
-			// randomly fail 1% of tasks
-			if rand.Intn(100) == 1 {
+			n, err := t.Payload.GetInt("data")
+			if err != nil {
+				b.Logf("internal error: %v", err)
+			}
+			retried, ok := GetRetryCount(ctx)
+			if !ok {
+				b.Logf("internal error: %v", err)
+			}
+			// Fail 1% of tasks for the first attempt.
+			if retried == 0 && n%100 == 0 {
 				return fmt.Errorf(":(")
 			}
 			wg.Done()
diff --git a/heartbeat.go b/heartbeat.go
index 26907f3..cc59a76 100644
--- a/heartbeat.go
+++ b/heartbeat.go
@@ -11,6 +11,7 @@ import (
 
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/log"
+	"github.com/hibiken/asynq/internal/rdb"
 	"github.com/rs/xid"
 )
 
@@ -162,4 +163,16 @@ func (h *heartbeater) beat() {
 	if err := h.broker.WriteServerState(&info, ws, h.interval*2); err != nil {
 		h.logger.Errorf("could not write server state data: %v", err)
 	}
+
+	// Debug purpose
+	rdb, ok := h.broker.(*rdb.RDB)
+	if !ok {
+		return
+	}
+	stats, err := rdb.CurrentStats()
+	if err != nil {
+		h.logger.Errorf("could not get current stat: %v", err)
+	} else {
+		h.logger.Debugf("current stats: %+v", stats)
+	}
 }