github.com/ghodss/etcd@v0.3.1-0.20140417172404-cc329bfa55cb/tests/functional/kill_random_test.go (about)

     1  package test
     2  
     3  import (
     4  	"fmt"
     5  	"math/rand"
     6  	"os"
     7  	"testing"
     8  	"time"
     9  )
    10  
    11  // TestKillRandom kills random peers in the cluster and
    12  // restart them after all other peers agree on the same leader
    13  func TestKillRandom(t *testing.T) {
    14  	procAttr := new(os.ProcAttr)
    15  	procAttr.Files = []*os.File{nil, os.Stdout, os.Stderr}
    16  
    17  	clusterSize := 9
    18  	argGroup, etcds, err := CreateCluster(clusterSize, procAttr, false)
    19  
    20  	if err != nil {
    21  		t.Fatal("cannot create cluster")
    22  	}
    23  
    24  	defer DestroyCluster(etcds)
    25  
    26  	stop := make(chan bool)
    27  	leaderChan := make(chan string, 1)
    28  	all := make(chan bool, 1)
    29  
    30  	time.Sleep(3 * time.Second)
    31  
    32  	go Monitor(clusterSize, 4, leaderChan, all, stop)
    33  
    34  	toKill := make(map[int]bool)
    35  
    36  	for i := 0; i < 20; i++ {
    37  		fmt.Printf("TestKillRandom Round[%d/20]\n", i)
    38  
    39  		j := 0
    40  		for {
    41  
    42  			r := rand.Int31n(9)
    43  			if _, ok := toKill[int(r)]; !ok {
    44  				j++
    45  				toKill[int(r)] = true
    46  			}
    47  
    48  			if j > 3 {
    49  				break
    50  			}
    51  
    52  		}
    53  
    54  		for num := range toKill {
    55  			err := etcds[num].Kill()
    56  			if err != nil {
    57  				panic(err)
    58  			}
    59  			etcds[num].Wait()
    60  		}
    61  
    62  		time.Sleep(1 * time.Second)
    63  
    64  		<-leaderChan
    65  
    66  		for num := range toKill {
    67  			etcds[num], err = os.StartProcess(EtcdBinPath, argGroup[num], procAttr)
    68  		}
    69  
    70  		toKill = make(map[int]bool)
    71  		<-all
    72  	}
    73  
    74  	stop <- true
    75  }