add 'thrash' test that starts and stops a bunch of rc's in parallel

test/e2e/density.go

@@ -18,6 +18,7 @@ package e2e
 
 import (
 	"fmt"
+	"sync"
 	"time"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
@@ -195,4 +196,20 @@ var _ = PDescribe("Density", func() {
 		RCName = "my-hostname-density100-" + string(util.NewUUID())
 		RunRC(c, RCName, ns, "dockerfile/nginx", 100*minionCount)
 	})
+
+	It("should have master components that can handle many short-lived pods", func() {
+		threads := 5
+		var wg sync.WaitGroup
+		wg.Add(threads)
+		for i := 0; i < threads; i++ {
+			go func() {
+				defer wg.Done()
+				for i := 0; i < 10; i++ {
+					name := "my-hostname-thrash-" + string(util.NewUUID())
+					RunRC(c, name, ns, "kubernetes/pause", 10*minionCount)
+				}
+			}()
+		}
+		wg.Wait()
+	})
 })