/usr/share/gocode/src/github.com/minio/dsync/chaos/chaos.go is in golang-github-minio-dsync-dev 0.0~git20170209.0.b9f7da7-1.
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"flag"
"fmt"
"log"
"math/rand"
"os"
"os/exec"
"strconv"
"strings"
"sync"
"time"
"github.com/minio/dsync"
)
var (
portFlag = flag.Int("p", portStart, "Port for server to listen on")
writeLockFlag = flag.String("w", "", "Name of write lock to acquire")
readLockFlag = flag.String("r", "", "Name of read lock to acquire")
servers []*exec.Cmd
)
const chaosName = "chaos"
const n = 4
const portStart = 12345
const rpcPathPrefix = "/dsync"
// testNotEnoughServersForQuorum verifies that when quorum cannot be achieved that locking will block.
// Once another server comes up and quorum becomes possible, the lock will be granted
func testNotEnoughServersForQuorum(wg *sync.WaitGroup) {
defer wg.Done()
log.Println("")
log.Println("**STARTING** testNotEnoughServersForQuorum")
// first kill half the quorum of servers
for k := len(servers) - 1; k >= n/2; k-- {
cmd := servers[k]
servers = servers[0:k]
killProcess(cmd)
}
// launch a new server after some time
go func() {
time.Sleep(7 * time.Second)
log.Println("Launching extra server")
servers = append(servers, launchTestServers(n/2, 1)...)
}()
dm := dsync.NewDRWMutex("test")
log.Println("Trying to acquire lock but too few servers active...")
dm.Lock()
log.Println("Acquired lock")
time.Sleep(2 * time.Second)
// kill extra server (quorum not available anymore)
log.Println("Killing extra server")
cmd := servers[n/2]
servers = servers[0 : n/2]
killProcess(cmd)
dm.Unlock()
log.Println("Released lock")
// launch new server again after some time
go func() {
time.Sleep(5 * time.Second)
log.Println("Launching extra server again")
servers = append(servers, launchTestServers(n/2, 1)...)
}()
log.Println("Trying to acquire lock again but too few servers active...")
dm.Lock()
log.Println("Acquired lock again")
dm.Unlock()
log.Println("Released lock")
// spin up servers again
for k := len(servers); k < n; k++ {
servers = append(servers, launchTestServers(k, 1)...)
}
log.Println("**PASSED** testNotEnoughServersForQuorum")
}
// testServerGoingDown tests that a lock is granted when all servers are up, after too
// many servers die that a new lock will block and once servers are up again, the lock is granted.
func testServerGoingDown(wg *sync.WaitGroup) {
defer wg.Done()
log.Println("")
log.Println("**STARTING** testServerGoingDown")
dm := dsync.NewDRWMutex("test")
dm.Lock()
log.Println("Acquired lock")
time.Sleep(100 * time.Millisecond)
dm.Unlock()
log.Println("Released lock")
// kill half the quorum of servers
for k := len(servers) - 1; k >= n/2; k-- {
cmd := servers[k]
servers = servers[0:k]
killProcess(cmd)
}
log.Println("Killed half the servers")
// spin up servers after some time
go func() {
time.Sleep(5 * time.Second)
for k := len(servers); k < n; k++ {
servers = append(servers, launchTestServers(k, 1)...)
}
log.Println("All servers active again")
}()
log.Println("Trying to acquire lock...")
dm.Lock()
log.Println("Acquired lock again")
dm.Unlock()
log.Println("Released lock")
log.Println("**PASSED** testServerGoingDown")
}
// testServerDownDuringLock verifies that if a server goes down while a lock is held, and comes back later
// another lock on the same name is not granted too early
func testSingleServerOverQuorumDownDuringLock(wg *sync.WaitGroup) {
defer wg.Done()
log.Println("")
log.Println("**STARTING** testSingleServerOverQuorumDownDuringLock")
// make sure that we just have enough quorum
// kill half the quorum of servers
for k := len(servers) - 1; k >= n/2+1; k-- {
cmd := servers[k]
servers = servers[0:k]
killProcess(cmd)
}
log.Println("Killed just enough servers to keep quorum")
dm := dsync.NewDRWMutex("test")
// acquire lock
dm.Lock()
log.Println("Acquired lock")
// kill one server which will lose one active lock
cmd := servers[n/2]
servers = servers[0 : n/2]
killProcess(cmd)
log.Println("Killed one more server to lose quorum")
// spin up servers after some time
go func() {
time.Sleep(2 * time.Second)
for k := len(servers); k < n; k++ {
servers = append(servers, launchTestServers(k, 1)...)
}
time.Sleep(100 * time.Millisecond)
log.Println("All servers active again -- but new lock still blocking")
time.Sleep(6 * time.Second)
log.Println("About to unlock first lock -- new lock should be granted")
dm.Unlock()
}()
dm2 := dsync.NewDRWMutex("test")
// try to acquire same lock -- only granted after first lock released
log.Println("Trying to acquire new lock on same resource...")
dm2.Lock()
log.Println("New lock granted")
// release lock
dm2.Unlock()
log.Println("New lock released")
log.Println("**PASSED** testSingleServerOverQuorumDownDuringLock")
}
// testMultipleServersOverQuorumDownDuringLockKnownError verifies that if multiple servers go down while a lock is held, and come back later
// another lock on the same name is granted too early
//
// Specific deficiency: more than one lock is granted on the same (exclusive) resource
func testMultipleServersOverQuorumDownDuringLockKnownError(wg *sync.WaitGroup) {
defer wg.Done()
log.Println("")
log.Println("**STARTING** testMultipleServersOverQuorumDownDuringLockKnownError")
dm := dsync.NewDRWMutex("test")
// acquire lock
dm.Lock()
log.Println("Acquired lock")
// kill enough servers to free up enough servers to allow new quorum once restarted
for k := len(servers) - 1; k >= n-(n/2+1); k-- {
cmd := servers[k]
servers = servers[0:k]
killProcess(cmd)
}
log.Printf("Killed enough servers to free up enough servers to allow new quorum once restarted (still %d active)", len(servers))
// spin up servers after some time
go func() {
time.Sleep(2 * time.Second)
for k := len(servers); k < n; k++ {
servers = append(servers, launchTestServers(k, 1)...)
}
time.Sleep(100 * time.Millisecond)
log.Println("All servers active again -- new lock already granted")
time.Sleep(5 * time.Second)
log.Println("About to unlock first lock -- but new lock already granted")
dm.Unlock()
}()
dm2 := dsync.NewDRWMutex("test")
// try to acquire same lock -- granted once killed servers are up again
log.Println("Trying to acquire new lock on same resource...")
dm2.Lock()
log.Println("New lock granted (too soon)")
time.Sleep(6 * time.Second)
// release lock
dm2.Unlock()
log.Println("New lock released")
log.Println("**PASSED WITH KNOWN ERROR** testMultipleServersOverQuorumDownDuringLockKnownError")
}
// testSingleStaleLock verifies that, despite a single stale lock, a new lock can still be acquired on same resource
func testSingleStaleLock(wg *sync.WaitGroup, beforeMaintenanceKicksIn bool) {
defer wg.Done()
log.Println("")
log.Println(fmt.Sprintf("**STARTING** testSingleStaleLock(beforeMaintenanceKicksIn: %v)", beforeMaintenanceKicksIn))
time.Sleep(500 * time.Millisecond)
lockName := fmt.Sprintf("single-stale-locks-%v", time.Now())
// kill last server and restart with a client that acquires 'test-stale'
killLastServer()
servers = append(servers, launchTestServersWithLocks(len(servers), 1, lockName, true)...)
time.Sleep(500 * time.Millisecond)
// kill all but (this) server -- so we have one stale lock
for i := len(servers) - 1; i >= 1; i-- {
killLastServer()
}
time.Sleep(500 * time.Millisecond)
// restart all servers
servers = append(servers, launchTestServers(len(servers), n-len(servers))...)
time.Sleep(500 * time.Millisecond)
// lock on same resource can be acquired despite single server having a stale lock
dm := dsync.NewDRWMutex(lockName)
ch := make(chan struct{})
// try to acquire lock in separate routine (will not succeed)
go func() {
log.Println("Trying to get the lock")
dm.Lock()
ch <- struct{}{}
}()
timeOut := time.After(2 * time.Second)
if !beforeMaintenanceKicksIn {
timeOut = time.After(60 * time.Second)
}
select {
case <-ch:
if beforeMaintenanceKicksIn {
log.Fatalln("Acquired lock -- SHOULD NOT HAPPEN")
} else {
log.Println("Acquired lock")
}
dm.Unlock()
time.Sleep(250 * time.Millisecond) // Allow messages to get out
case <-timeOut:
if beforeMaintenanceKicksIn {
log.Println("Timed out (expected)")
} else {
log.Fatalln("Timed out -- SHOULD NOT HAPPEN")
}
}
log.Println(fmt.Sprintf("**PASSED** testSingleStaleLock(beforeMaintenanceKicksIn: %v)", beforeMaintenanceKicksIn))
}
// testMultipleStaleLocks verifies that
// (before maintenance) multiple stale locks will prevent a new lock from being granted
// ( after maintenance) multiple stale locks not will prevent a new lock from being granted
func testMultipleStaleLocks(wg *sync.WaitGroup, beforeMaintenanceKicksIn bool) {
defer wg.Done()
log.Println("")
log.Println(fmt.Sprintf("**STARTING** testMultipleStaleLocks(beforeMaintenanceKicksIn: %v)", beforeMaintenanceKicksIn))
time.Sleep(500 * time.Millisecond)
lockName := fmt.Sprintf("multiple-stale-locks-%v", time.Now())
// kill last server and restart with a client that acquires 'multiple-stale-lock'
killLastServer()
servers = append(servers, launchTestServersWithLocks(len(servers), 1, lockName, true)...)
time.Sleep(500 * time.Millisecond)
// kill all but (this) server -- so we have one state lock
for i := len(servers) - 1; i >= n/2; i-- {
killLastServer()
}
time.Sleep(500 * time.Millisecond)
// restart all servers
servers = append(servers, launchTestServers(len(servers), n-len(servers))...)
time.Sleep(500 * time.Millisecond)
// lock on same resource can not be acquired due to too many servers having a stale lock
dm := dsync.NewDRWMutex(lockName)
ch := make(chan struct{})
// try to acquire lock in separate routine (will not succeed)
go func() {
log.Println("Trying to get the lock")
dm.Lock()
ch <- struct{}{}
}()
timeOut := time.After(2 * time.Second)
if !beforeMaintenanceKicksIn {
timeOut = time.After(60 * time.Second)
}
select {
case <-ch:
if beforeMaintenanceKicksIn {
log.Fatalln("Acquired lock -- SHOULD NOT HAPPEN")
} else {
log.Println("Acquired lock")
}
dm.Unlock()
time.Sleep(250 * time.Millisecond) // Allow messages to get out
case <-timeOut:
if beforeMaintenanceKicksIn {
log.Println("Timed out (expected)")
} else {
log.Fatalln("Timed out -- SHOULD NOT HAPPEN")
}
}
log.Println(fmt.Sprintf("**PASSED** testMultipleStaleLocks(beforeMaintenanceKicksIn: %v)", beforeMaintenanceKicksIn))
}
// testClientThatHasLockCrashes verifies that (after a lock maintenance loop)
// multiple stale locks will not prevent a new lock on same resource
func testClientThatHasLockCrashes(wg *sync.WaitGroup) {
defer wg.Done()
log.Println("")
log.Println("**STARTING** testClientThatHasLockCrashes")
time.Sleep(500 * time.Millisecond)
// kill last server and restart with a client that acquires 'test-stale' lock
killLastServer()
servers = append(servers, launchTestServersWithLocks(len(servers), 1, "test-stale", true)...)
time.Sleep(3 * time.Second)
// crash the last server (creating stale locks at the other servers)
killLastServer()
log.Println("Client that has lock crashes; leaving stale locks at other servers")
time.Sleep(10 * time.Second)
// spin up crashed server again
servers = append(servers, launchTestServers(len(servers), 1)...)
log.Println("Crashed server restarted")
dm := dsync.NewDRWMutex("test-stale")
ch := make(chan struct{})
// try to acquire lock in separate routine (will not succeed)
go func() {
log.Println("Trying to get the lock again")
dm.Lock()
ch <- struct{}{}
}()
select {
case <-ch:
log.Println("Acquired lock again")
dm.Unlock()
time.Sleep(1 * time.Second) // Allow messages to get out
case <-time.After(60 * time.Second):
log.Fatalln("Timed out -- SHOULD NOT HAPPEN")
}
log.Println("**PASSED** testClientThatHasLockCrashes")
}
// Same as testClientThatHasLockCrashes but with two clients having read locks
func testTwoClientsThatHaveReadLocksCrash(wg *sync.WaitGroup) {
defer wg.Done()
log.Println("")
log.Println("**STARTING** testTwoClientsThatHaveReadLocksCrash")
time.Sleep(500 * time.Millisecond)
// kill two servers and restart with a client that acquires a read lock on 'test-stale'
killLastServer()
killLastServer()
servers = append(servers, launchTestServersWithLocks(len(servers), 2, "test-stale", false)...)
time.Sleep(3 * time.Second)
// crash last two servers (creating stale locks at the other servers)
killLastServer()
killLastServer()
log.Println("Two clients with read locks crashed; leaving stale locks at other servers")
time.Sleep(10 * time.Second)
// spin up crashed servers again
servers = append(servers, launchTestServers(len(servers), 2)...)
log.Println("Crashed servers restarted")
dm := dsync.NewDRWMutex("test-stale")
ch := make(chan struct{})
// try to acquire lock in separate routine (will not succeed)
go func() {
log.Println("Trying to get the lock again")
dm.Lock()
ch <- struct{}{}
}()
select {
case <-ch:
log.Println("Acquired lock again")
dm.Unlock()
time.Sleep(1 * time.Second) // Allow messages to get out
case <-time.After(60 * time.Second):
log.Fatalln("Timed out -- SHOULD NOT HAPPEN")
}
log.Println("**PASSED** testTwoClientsThatHaveReadLocksCrash")
}
type RWLocker interface {
Lock()
RLock()
Unlock()
RUnlock()
}
type DRWMutexNoWriterStarvation struct {
excl *dsync.DRWMutex
rw *dsync.DRWMutex
}
func NewDRWMutexNoWriterStarvation(name string) *DRWMutexNoWriterStarvation {
return &DRWMutexNoWriterStarvation{
excl: dsync.NewDRWMutex(name + "-excl-no-writer-starvation"),
rw: dsync.NewDRWMutex(name),
}
}
func (d *DRWMutexNoWriterStarvation) Lock() {
d.excl.Lock()
defer d.excl.Unlock()
d.rw.Lock()
}
func (d *DRWMutexNoWriterStarvation) Unlock() {
d.rw.Unlock()
}
func (d *DRWMutexNoWriterStarvation) RLock() {
d.excl.Lock()
defer d.excl.Unlock()
d.rw.RLock()
}
func (d *DRWMutexNoWriterStarvation) RUnlock() {
d.rw.RUnlock()
}
// testWriterStarvation tests that a separate implementation using a pair
// of two DRWMutexes can prevent writer starvation (due to too many read locks)
func testWriterStarvation(wg *sync.WaitGroup, noWriterStarvation bool) {
defer wg.Done()
log.Println("")
log.Println(fmt.Sprintf("**STARTING** testWriterStarvation(noWriterStarvation: %v)", noWriterStarvation))
start := time.Now()
var m RWLocker
if noWriterStarvation {
m = NewDRWMutexNoWriterStarvation("test") // sync.RWMutex{} behaves identical
} else {
m = dsync.NewDRWMutex("test")
}
m.RLock()
log.Println("Acquired (1st) read lock")
wgReadLocks := sync.WaitGroup{}
wgReadLocks.Add(2)
go func() {
defer wgReadLocks.Done()
time.Sleep(2 * time.Second)
log.Println("About to release (1st) read lock")
m.RUnlock()
log.Println("Released (1st) read lock")
}()
go func() {
defer wgReadLocks.Done()
time.Sleep(10 * time.Millisecond)
log.Println("About to acquire (second) read lock")
m.RLock()
log.Println("Acquired (2nd) read lock")
time.Sleep(2 * time.Second)
m.RUnlock()
log.Println("Released (2nd) read lock")
}()
log.Println("About to acquire write lock")
m.Lock()
log.Println("Acquired write lock")
time.Sleep(2 * time.Second)
m.Unlock()
log.Println("Released write lock")
wgReadLocks.Wait()
noStarvation := time.Since(start) > 5*time.Second
if noWriterStarvation {
if noStarvation {
log.Println(fmt.Sprintf("**PASSED** testWriterStarvation(noWriterStarvation: %v)", noWriterStarvation))
} else {
log.Fatalln("Second read lock got preference over write lock -- SHOULD NOT HAPPEN")
}
} else {
if !noStarvation {
log.Println(fmt.Sprintf("**PASSED** testWriterStarvation(noWriterStarvation: %v)", noWriterStarvation))
} else {
log.Fatalln("Second read lock did not get preference over write lock -- NOT EXPECTED")
}
}
}
func getSelfNode(rpcClnts []dsync.NetLocker, port int) int {
index := -1
for i, c := range rpcClnts {
p, _ := strconv.Atoi(strings.Split(c.ServerAddr(), ":")[1])
if port == p {
if index == -1 {
index = i
} else {
panic("More than one port found")
}
}
}
return index
}
func main() {
rand.Seed(time.Now().UTC().UnixNano())
flag.Parse()
if *portFlag != portStart {
if *writeLockFlag != "" || *readLockFlag != "" {
go func() {
// Initialize net/rpc clients for dsync.
var clnts []dsync.NetLocker
for i := 0; i < n; i++ {
clnts = append(clnts, newClient(fmt.Sprintf("127.0.0.1:%d", portStart+i), rpcPathPrefix+"-"+strconv.Itoa(portStart+i)))
}
if err := dsync.Init(clnts, getSelfNode(clnts, *portFlag)); err != nil {
log.Fatalf("set nodes failed with %v", err)
}
// Give servers some time to start
time.Sleep(100 * time.Millisecond)
if *writeLockFlag != "" {
lock := dsync.NewDRWMutex(*writeLockFlag)
lock.Lock()
log.Println("Acquired write lock:", *writeLockFlag, "(never to be released)")
}
if *readLockFlag != "" {
lock := dsync.NewDRWMutex(*readLockFlag)
lock.RLock()
log.Println("Acquired read lock:", *readLockFlag, "(never to be released)")
}
// We will hold on to the lock
}()
}
// Does not return, will listen on port
startRPCServer(*portFlag)
}
// Make sure no child processes are still running
if killStaleProcesses(chaosName) {
os.Exit(-1)
}
// For first client, start server and continue
go startRPCServer(*portFlag)
servers = []*exec.Cmd{}
log.SetPrefix(fmt.Sprintf("[%s] ", chaosName))
log.SetFlags(log.Lmicroseconds)
servers = append(servers, &exec.Cmd{}) // Add fake process for first entry
servers = append(servers, launchTestServers(1, n-1)...)
// Initialize net/rpc clients for dsync.
var clnts []dsync.NetLocker
for i := 0; i < n; i++ {
clnts = append(clnts, newClient(fmt.Sprintf("127.0.0.1:%d", portStart+i), rpcPathPrefix+"-"+strconv.Itoa(portStart+i)))
}
// This process serves as the first server
if err := dsync.Init(clnts, getSelfNode(clnts, *portFlag)); err != nil {
log.Fatalf("set nodes failed with %v", err)
}
time.Sleep(100 * time.Millisecond)
wg := sync.WaitGroup{}
wg.Add(1)
go testNotEnoughServersForQuorum(&wg)
wg.Wait()
wg.Add(1)
go testServerGoingDown(&wg)
wg.Wait()
wg.Add(1)
testSingleServerOverQuorumDownDuringLock(&wg)
wg.Wait()
wg.Add(1)
testMultipleServersOverQuorumDownDuringLockKnownError(&wg)
wg.Wait()
wg.Add(1)
testClientThatHasLockCrashes(&wg)
wg.Wait()
wg.Add(1)
testTwoClientsThatHaveReadLocksCrash(&wg)
wg.Wait()
wg.Add(1)
beforeMaintenanceKicksIn := true
testSingleStaleLock(&wg, beforeMaintenanceKicksIn)
wg.Wait()
wg.Add(1)
beforeMaintenanceKicksIn = false
testSingleStaleLock(&wg, beforeMaintenanceKicksIn)
wg.Wait()
wg.Add(1)
beforeMaintenanceKicksIn = true
testMultipleStaleLocks(&wg, beforeMaintenanceKicksIn)
wg.Wait()
wg.Add(1)
beforeMaintenanceKicksIn = false
testMultipleStaleLocks(&wg, beforeMaintenanceKicksIn)
wg.Wait()
wg.Add(1)
noWriterStarvation := true
testWriterStarvation(&wg, noWriterStarvation)
wg.Wait()
wg.Add(1)
noWriterStarvation = false
testWriterStarvation(&wg, noWriterStarvation)
wg.Wait()
// Kill any launched processes
killStaleProcesses(chaosName)
}
func killStaleProcesses(name string) bool {
cmd := exec.Command("pgrep", name)
cmb, _ := cmd.CombinedOutput()
procs := strings.Count(string(cmb), "\n")
if procs > 1 {
fmt.Println("Found more than one", name, "process. Killing all and exiting")
cmd = exec.Command("pkill", "-SIGKILL", name)
cmd.CombinedOutput()
return true
}
return false
}
func launchTestServers(start, number int) []*exec.Cmd {
result := []*exec.Cmd{}
for p := portStart + start; p < portStart+start+number; p++ {
result = append(result, launchProcess(p, "", false))
}
return result
}
func launchTestServersWithLocks(start, number int, name string, writeLock bool) []*exec.Cmd {
result := []*exec.Cmd{}
for p := portStart + start; p < portStart+start+number; p++ {
result = append(result, launchProcess(p, name, writeLock))
}
return result
}
func launchProcess(port int, name string, writeLock bool) *exec.Cmd {
var cmd *exec.Cmd
if name == "" {
cmd = exec.Command("./"+chaosName, "-p", fmt.Sprintf("%d", port))
} else if writeLock {
cmd = exec.Command("./"+chaosName, "-p", fmt.Sprintf("%d", port), "-w", name)
} else {
cmd = exec.Command("./"+chaosName, "-p", fmt.Sprintf("%d", port), "-r", name)
}
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
go func(cmd *exec.Cmd) {
err := cmd.Start()
if err != nil {
log.Fatal(err)
}
}(cmd)
return cmd
}
func killLastServer() {
cmd := servers[len(servers)-1]
servers = servers[0 : len(servers)-1]
killProcess(cmd)
}
func killProcess(cmd *exec.Cmd) {
if err := cmd.Process.Kill(); err != nil {
log.Fatal("failed to kill: ", err)
}
}
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