/
main.go
617 lines (510 loc) · 14.5 KB
/
main.go
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package main
import (
"flag"
"log"
"time"
"fmt"
"sync"
"os"
"strings"
"github.com/AdRoll/goamz/aws"
"github.com/AdRoll/goamz/dynamodb"
"text/template"
)
var numIn = flag.Int("numIn", 4, "Number of DynamoDB read thread")
var numOut = flag.Int("numOut", 4, "Number of DynamoDB read thread")
var batchSize = flag.Int("batchSize", 10, "size for DynamoDB batch write")
var tps = flag.Int("tps", 1000, "Default TPS")
var tableSrc = flag.String("src", "", "Src table name")
var tableDst = flag.String("dst", "", "Dst table name")
var region = flag.String("r", "ap-southeast-2", "Region. Default would be Sydney.")
const READ_BATCH = 100
const WORK2_BUFFER = 10000
const EVENTS_BUFFER = 10000
var RETRY_SLEEP_SEQUENCE = []time.Duration{
time.Millisecond * 400,
time.Millisecond * 800,
time.Millisecond * 1600,
time.Millisecond * 3200,
time.Millisecond * 6400,
}
type Event struct {
src string
category string
detail string
}
func finish(
done chan string, role string){
done <- role
}
func regulator_thread(desire_tps int,
work chan map[string]*dynamodb.Attribute,
work2 chan map[string]*dynamodb.Attribute,
done chan string){
defer finish(done, "Regulator")
desire_tp_01s := desire_tps / 10
duration_01s := 100 * time.Millisecond
//fmt.Printf("desire_tp_01s: %v, duration_01s: %v\n",
// desire_tp_01s, duration_01s)
//defer close(tick) // cannot close receive only channel
i := 0
t1 := time.Now()
for w := range work {
work2 <- w
i++
if i % desire_tp_01s == 0 {
t2 := time.Now()
delta := duration_01s - t2.Sub(t1)
if delta > 0 {
time.Sleep(delta)
}
t1 = time.Now()
}
}
}
type Reader struct {
src string
tableName string
auth *aws.Auth
region aws.Region
attributeComparisons []dynamodb.AttributeComparison
seg_id int
total_seg int
batch_size int
count int64
work chan map[string]*dynamodb.Attribute
done chan string
events chan Event
}
func (self *Reader) run(){
defer finish(self.done, self.src) // To signal that job is done
server := dynamodb.New(*self.auth, self.region)
//just test the connection to dyno table
tableDesc, err := server.DescribeTable(self.tableName)
if err != nil {
log.Fatal("Could not DescribeTable", err)
}
pk, err := tableDesc.BuildPrimaryKey()
if err != nil {
log.Fatal("Could not BuildPrimaryKey", err)
}
table := server.NewTable(self.tableName, pk)
items, startKey, err := table.ParallelScanPartialLimit(
self.attributeComparisons, nil,
self.seg_id, self.total_seg, int64(self.batch_size))
if err == nil {
for _, item := range items {
self.work <- item
self.count += 1
}
for startKey != nil {
items, startKey, err = table.ParallelScanPartialLimit(
self.attributeComparisons, startKey,
self.seg_id, self.total_seg, int64(self.batch_size))
if err == nil {
for _, item := range items {
self.work <- item
self.count += 1
}
}else{
e := Event {
self.src,
"error",
err.Error(),
}
self.events <- e
}
}
}else{
e := Event {
self.src,
"error",
err.Error(),
}
self.events <- e
}
}
func newReader(
tableName string,
auth *aws.Auth,
region aws.Region,
attributeComparisons []dynamodb.AttributeComparison,
seg_id int,
total_seg int,
batch_size int,
work chan map[string]*dynamodb.Attribute,
done chan string,
events chan Event) *Reader {
return &Reader{
fmt.Sprintf("R%04d", seg_id),
tableName,
auth,
region,
attributeComparisons,
seg_id,
total_seg,
batch_size,
int64(0),
work,
done,
events,
}
}
type Writer struct {
src string
writer_id int
tableName string
auth *aws.Auth
region aws.Region
batch_size int
count int64
work chan map[string]*dynamodb.Attribute
done chan string
events chan Event
}
func newWriter (
writer_id int,
tableName string,
auth *aws.Auth,
region aws.Region,
batch_size int,
work chan map[string]*dynamodb.Attribute,
done chan string,
events chan Event) *Writer {
return &Writer{
fmt.Sprintf("W%04d", writer_id),
writer_id,
tableName,
auth,
region,
batch_size,
0,
work,
done,
events,
}
}
func (self *Writer) batch_shoot(
table *dynamodb.Table,
batch [][]dynamodb.Attribute) error {
m := map[string][][]dynamodb.Attribute{
"Put": batch,
}
bw := table.BatchWriteItems(m)
var err error
var unprocessed map[string]interface {}
max_retry_seq := len(RETRY_SLEEP_SEQUENCE) - 1
for i, t := range RETRY_SLEEP_SEQUENCE {
unprocessed, err = bw.Execute()
if err == nil && len(unprocessed) == 0 {
self.count += int64(len(batch))
return nil
}
if err != nil && len(unprocessed) > 0{
// unprocessed is not [][]dynamodb.Attribute
// So we just resent the whole batch
time.Sleep(t)
bw = table.BatchWriteItems(m)
if i < max_retry_seq {
self.events <- Event { self.src, "resend", err.Error()}
}
}
}
return err
}
func (self *Writer) run(){
defer finish(self.done, self.src) // To signal that job is done
server := dynamodb.New(*self.auth, self.region)
//just test the connection to dyno table
tableDesc, err := server.DescribeTable(self.tableName)
if err != nil {
log.Fatal("Could not DescribeTable", err)
}
pk, err := tableDesc.BuildPrimaryKey()
if err != nil {
log.Fatal("Could not BuildPrimaryKey", err)
}
table := server.NewTable(self.tableName, pk)
batch := [][]dynamodb.Attribute{}
for w := range self.work {
item := map_to_item(w)
batch = append(batch, *item)
if len(batch) == self.batch_size {
err = self.batch_shoot(table, batch)
if err != nil {
self.events <- Event {
self.src,
"error",
err.Error(),
}
}
batch = nil
}
}
if len(batch) > 0 {
// will do that again if batch isn't empty
err = self.batch_shoot(table, batch)
if err != nil {
self.events <- Event {
self.src,
"error",
err.Error(),
}
}
batch = nil
}
}
func map_to_item(obj map[string]*dynamodb.Attribute) *[]dynamodb.Attribute {
items := []dynamodb.Attribute{}
for _, v := range obj {
items = append(items, *v)
}
return &items
}
type Monitor struct {
lock *sync.Mutex
started_at time.Time
Elapsed time.Duration
Remain time.Duration
TitleBar string
Src string
Dst string
SrcTotal int64
DesireTps int
last_call time.Time
ReadCount int64
WriteCount int64
Progress float64
CurrentReadTps float64
CurrentWriteTps float64
ReadersTps []TpsStat
WritersTps []TpsStat
readers []*Reader
writers []*Writer
Doners []string
events chan Event
event_stats map[string]int64
EventStats map[string]int64
template *template.Template
done chan string
}
type TpsStat struct {
Src string
Count int64
}
func newMonitor(
src, dst string,
src_total int64, desire_tps int,
done chan string, events chan Event,
readers []*Reader, writers []*Writer) *Monitor {
tpl := `{{ .Src}} => {{ .Dst }}
{{ .TitleBar }}
Time:
Elapsed: {{ .Elapsed }}
Remain: {{ .Remain }}
Progress:
{{ .Progress | progressbar }} {{ .Progress | printf "%.2f" }} %
Written/Total: {{ .WriteCount }} / {{ .SrcTotal }},
Read: {{ .ReadCount }} Write: {{ .WriteCount }}
TPS:
Desire: {{ .DesireTps }}
Instant Read: {{ .CurrentReadTps | printf "%.2f" }}
Instant Write: {{ .CurrentWriteTps | printf "%.2f" }}
TPS Breakdown:
Readers: {{range .ReadersTps}} {{ .Src }}: {{ .Count }}, {{end}}
Writers: {{range .WritersTps}} {{ .Src }}: {{ .Count }}, {{end}}
{{ if .EventStats }}
Events:
{{ range $key, $value := .EventStats }}{{ $key }}: {{ $value }}
{{ end }}
{{ end }}
{{ if .Doners }}
Done:
{{range .Doners}} {{.}}, {{end}}
{{ end }}`
t := template.New("monitorOutput")
t = t.Funcs(template.FuncMap{"progressbar": ProgressBar})
t = template.Must(t.Parse(tpl))
return &Monitor {
lock: &sync.Mutex{},
started_at: time.Now(),
Src: src,
Dst: dst,
SrcTotal: src_total,
DesireTps: desire_tps,
last_call: time.Now(),
ReadCount: 0,
WriteCount: 0,
CurrentReadTps: float64(0),
CurrentWriteTps: float64(0),
Doners: []string{},
ReadersTps: nil,
WritersTps: nil,
readers: readers,
writers: writers,
events: events,
event_stats: make(map[string]int64),
EventStats: make(map[string]int64),
template: t,
done: done,
TitleBar: strings.Repeat("=", len(src) + len(dst) + 4),
}
}
func (self *Monitor) run(){
go self.collect_event()
c := time.Tick(1 * time.Second)
for _ = range c {
self.show()
}
}
func (self *Monitor) show(){
self.lock.Lock()
defer self.lock.Unlock()
self.collect_rw_stat()
fmt.Printf("\033[H\033[2J")
self.template.Execute(os.Stdout, *self)
}
func ProgressBar(progress float64) string {
completed := int(progress / 10)
if completed < 10{
return fmt.Sprintf("[%s>%s]", strings.Repeat("=", completed), strings.Repeat(".", 10-completed))
}else{
return fmt.Sprintf("[%s]", strings.Repeat("=", 12))
}
}
func (self *Monitor) update_EventStat(){
self.lock.Lock()
defer self.lock.Unlock()
for k,v := range self.event_stats {
self.EventStats[k] = v
}
}
func (self *Monitor) collect_event(){
defer finish(self.done, "Monitor")
for e := range self.events {
// ignoring the detail error
k := fmt.Sprintf("%s|%s", e.src, e.category)
count, _ := self.event_stats[k]
count += 1
self.event_stats[k] = count
self.update_EventStat()
}
}
func (self *Monitor) collect_rw_stat() {
// this function should only be called in show
// as show() accquired the lock.
// or before you call it, just accquire the lock first.
write_count := int64(0)
read_count := int64(0)
writers_tps := []TpsStat {}
readers_tps := []TpsStat {}
for _, w := range self.writers {
writers_tps = append(writers_tps, TpsStat{w.src, w.count})
write_count += w.count
}
self.WritersTps = writers_tps
for _, r := range self.readers {
readers_tps = append(readers_tps, TpsStat{r.src, r.count})
read_count += r.count
}
self.ReadersTps = readers_tps
now := time.Now()
duration := now.Sub(self.last_call)
self.CurrentWriteTps = float64( write_count - self.WriteCount ) / duration.Seconds()
self.CurrentReadTps = float64( read_count - self.ReadCount ) / duration.Seconds()
self.Progress = float64(write_count * 100) / float64(self.SrcTotal )
self.last_call = now
self.WriteCount = write_count
self.ReadCount = read_count
self.Elapsed = time.Now().Sub(self.started_at)
if self.CurrentWriteTps > 0 && self.SrcTotal != self.WriteCount {
self.Remain = time.Duration(int64(float64( self.SrcTotal - self.WriteCount ) / self.CurrentWriteTps)) * time.Second
} else if self.SrcTotal == self.WriteCount {
self.Remain = time.Duration(0)
}else{
self.Remain = time.Duration(9999) * time.Hour
}
}
func (self *Monitor) drain(){
who := <- self.done
self.Doners = append(self.Doners, who)
//fmt.Printf("%s finished", who)
}
func sniff(auth *aws.Auth,
region aws.Region,
src string,
dst string) (*dynamodb.TableDescriptionT, *dynamodb.TableDescriptionT, error ) {
server := dynamodb.New(*auth, region)
//just test the connection to dyno table
srcDesc, err := server.DescribeTable(src)
if err != nil {
return nil, nil, err
}
dstDesc, err := server.DescribeTable(dst)
if err != nil {
return nil, nil, err
}
return srcDesc, dstDesc, nil
}
func main(){
flag.Parse()
default_cond := []dynamodb.AttributeComparison{}
auth, err := aws.GetAuth("", "", "", time.Now())
aws_region := aws.Regions[*region]
if err != nil {
log.Fatal("Failed to auth", err)
}
srcDesc, _, err := sniff(
&auth, aws_region, *tableSrc, *tableDst)
if err != nil {
log.Fatal("Failed to describe table.", err)
}
work := make(chan map[string]*dynamodb.Attribute, *numIn)
work2 := make(chan map[string]*dynamodb.Attribute, WORK2_BUFFER)
done := make(chan string)
events := make(chan Event, EVENTS_BUFFER)
var readers = make([]*Reader, *numIn)
var writers = make([]*Writer, *numOut)
mon := newMonitor(*tableSrc, *tableDst,
srcDesc.ItemCount, *tps,
done, events, readers, writers)
// this one never requires a done signal
go mon.run()
// read (4) => speed regulator (1) => write (4)
for i := 0; i < *numIn; i++ {
r := newReader( *tableSrc, &auth, aws_region,
default_cond,
i, *numIn, READ_BATCH,
work,
done, events)
readers[i] = r
go r.run()
}
// start a regulator to control the speed
go regulator_thread(*tps,
work, work2, done)
for j := 0; j < *numOut; j++ {
w := newWriter(j,
*tableDst, &auth, aws_region,
*batchSize, work2, done, events)
writers[j] = w
go w.run()
}
mon.show()
//wait for reader
for i :=0 ; i < *numIn; i ++ {
mon.drain()
}
close(work)
// wait for regulator
mon.drain()
close(work2)
//wait for writer
for j := 0; j < *numOut; j++ {
mon.drain()
}
close(events)
// for mon
mon.drain()
mon.show()
}