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partition.go
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partition.go
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// Copyright 2016 The Cockroach Authors.
//
// 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.
//
// Author: Tobias Schottdorf (tobias.schottdorf@gmail.com)
package acceptance
import (
"math/rand"
"testing"
"time"
"golang.org/x/net/context"
"github.com/cockroachdb/cockroach/pkg/acceptance/cluster"
"github.com/cockroachdb/cockroach/pkg/acceptance/iptables"
"github.com/cockroachdb/cockroach/pkg/util/log"
"github.com/cockroachdb/cockroach/pkg/util/stop"
)
func mustGetHosts(
ctx context.Context, t *testing.T, c cluster.Cluster,
) ([]iptables.IP, map[iptables.IP]int) {
var addrs []iptables.IP
addrsToNode := make(map[iptables.IP]int)
for i := 0; i < c.NumNodes(); i++ {
addr := iptables.IP(c.InternalIP(ctx, i).String())
addrsToNode[addr] = i
addrs = append(addrs, addr)
}
return addrs, addrsToNode
}
func randomBidirectionalPartition(numNodes int) [][]int {
if numNodes <= 1 {
return ([][]int{{0}})[:numNodes]
}
all := rand.Perm(numNodes)
r := 1 + rand.Intn(numNodes-1)
return [][]int{all[:r], all[r:]}
}
// A NemesisFn runs a nemesis on the given cluster, shutting down in a timely
// manner when the stop channel is closed.
type NemesisFn func(ctx context.Context, t *testing.T, c cluster.Cluster, stopper *stop.Stopper)
// BidirectionalPartitionNemesis is a nemesis which randomly severs the network
// symmetrically between two random groups of nodes. Partitioned and connected
// mode take alternating turns, with random durations of up to 15s.
func BidirectionalPartitionNemesis(
ctx context.Context, t *testing.T, c cluster.Cluster, stopper *stop.Stopper,
) {
randSec := func() time.Duration { return time.Duration(rand.Int63n(15 * int64(time.Second))) }
log.Infof(ctx, "cleaning up any previous rules")
_ = restoreNetwork(ctx, t, c) // clean up any potential leftovers
log.Infof(ctx, "starting partition nemesis")
for {
ch := make(chan struct{})
go func() {
select {
case <-time.After(randSec()):
case <-stopper.ShouldStop():
}
close(ch)
}()
cutNetwork(ctx, t, c, ch, randomBidirectionalPartition(c.NumNodes())...)
select {
case <-stopper.ShouldStop():
return
case <-time.After(randSec()):
}
}
}
var _ NemesisFn = BidirectionalPartitionNemesis
func restoreNetwork(ctx context.Context, t *testing.T, c cluster.Cluster) []error {
var errs []error
for i := 0; i < c.NumNodes(); i++ {
for _, cmd := range iptables.Reset() {
if err := c.ExecRoot(ctx, i, cmd); err != nil {
errs = append(errs, err)
}
}
}
return errs
}
func cutNetwork(
ctx context.Context, t *testing.T, c cluster.Cluster, closer <-chan struct{}, partitions ...[]int,
) {
defer func() {
if errs := restoreNetwork(ctx, t, c); len(errs) > 0 {
t.Fatalf("errors restoring the network: %+v", errs)
}
}()
addrs, addrsToNode := mustGetHosts(ctx, t, c)
ipPartitions := make([][]iptables.IP, 0, len(partitions))
for _, partition := range partitions {
ipPartition := make([]iptables.IP, 0, len(partition))
for _, nodeIndex := range partition {
ipPartition = append(ipPartition, addrs[nodeIndex])
}
ipPartitions = append(ipPartitions, ipPartition)
}
log.Warningf(ctx, "partitioning: %v (%v)", partitions, ipPartitions)
for host, cmds := range iptables.Rules(iptables.Bidirectional(ipPartitions...)) {
for _, cmd := range cmds {
if err := c.ExecRoot(ctx, addrsToNode[host], cmd); err != nil {
t.Fatal(err)
}
}
}
<-closer
log.Warningf(ctx, "resolved all partitions")
}