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Restructure and Cleanup

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This commit is contained in:
Jan Eitzinger 2024-05-06 14:20:43 +02:00
parent b2528f958c
commit fcc8eac2d5
12 changed files with 686 additions and 690 deletions
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162
cmd/cc-metric-store/main.go
View File

@ -4,7 +4,6 @@ import (
"bufio"
"context"
"flag"
"io"
"log"
"os"
"os/signal"
@ -20,120 +19,6 @@ import (
"github.com/google/gops/agent"
)
var (
conf config.Config
ms *memorystore.MemoryStore = nil
lastCheckpoint time.Time
)
var (
debugDumpLock sync.Mutex
debugDump io.Writer = io.Discard
)
func intervals(wg *sync.WaitGroup, ctx context.Context) {
wg.Add(3)
// go func() {
// defer wg.Done()
// ticks := time.Tick(30 * time.Minute)
// for {
// select {
// case <-ctx.Done():
// return
// case <-ticks:
// runtime.GC()
// }
// }
// }()
go func() {
defer wg.Done()
d, err := time.ParseDuration(conf.RetentionInMemory)
if err != nil {
log.Fatal(err)
}
if d <= 0 {
return
}
ticks := time.Tick(d / 2)
for {
select {
case <-ctx.Done():
return
case <-ticks:
t := time.Now().Add(-d)
log.Printf("start freeing buffers (older than %s)...\n", t.Format(time.RFC3339))
freed, err := ms.Free(nil, t.Unix())
if err != nil {
log.Printf("freeing up buffers failed: %s\n", err.Error())
} else {
log.Printf("done: %d buffers freed\n", freed)
}
}
}
}()
lastCheckpoint = time.Now()
go func() {
defer wg.Done()
d, err := time.ParseDuration(conf.Checkpoints.Interval)
if err != nil {
log.Fatal(err)
}
if d <= 0 {
return
}
ticks := time.Tick(d)
for {
select {
case <-ctx.Done():
return
case <-ticks:
log.Printf("start checkpointing (starting at %s)...\n", lastCheckpoint.Format(time.RFC3339))
now := time.Now()
n, err := ms.ToCheckpoint(conf.Checkpoints.RootDir,
lastCheckpoint.Unix(), now.Unix())
if err != nil {
log.Printf("checkpointing failed: %s\n", err.Error())
} else {
log.Printf("done: %d checkpoint files created\n", n)
lastCheckpoint = now
}
}
}
}()
go func() {
defer wg.Done()
d, err := time.ParseDuration(conf.Archive.Interval)
if err != nil {
log.Fatal(err)
}
if d <= 0 {
return
}
ticks := time.Tick(d)
for {
select {
case <-ctx.Done():
return
case <-ticks:
t := time.Now().Add(-d)
log.Printf("start archiving checkpoints (older than %s)...\n", t.Format(time.RFC3339))
n, err := memorystore.ArchiveCheckpoints(conf.Checkpoints.RootDir, conf.Archive.RootDir, t.Unix(), conf.Archive.DeleteInstead)
if err != nil {
log.Printf("archiving failed: %s\n", err.Error())
} else {
log.Printf("done: %d files zipped and moved to archive\n", n)
}
}
}
}()
}
func main() {
var configFile string
var enableGopsAgent bool
@ -142,33 +27,24 @@ func main() {
flag.Parse()
startupTime := time.Now()
conf = config.LoadConfiguration(configFile)
memorystore.Init(conf.Metrics)
ms = memorystore.GetMemoryStore()
config.Init(configFile)
memorystore.Init(config.Keys.Metrics)
ms := memorystore.GetMemoryStore()
if enableGopsAgent || conf.Debug.EnableGops {
if enableGopsAgent || config.Keys.Debug.EnableGops {
if err := agent.Listen(agent.Options{}); err != nil {
log.Fatal(err)
}
}
if conf.Debug.DumpToFile != "" {
f, err := os.Create(conf.Debug.DumpToFile)
if err != nil {
log.Fatal(err)
}
debugDump = f
}
d, err := time.ParseDuration(conf.Checkpoints.Restore)
d, err := time.ParseDuration(config.Keys.Checkpoints.Restore)
if err != nil {
log.Fatal(err)
}
restoreFrom := startupTime.Add(-d)
log.Printf("Loading checkpoints newer than %s\n", restoreFrom.Format(time.RFC3339))
files, err := ms.FromCheckpoint(conf.Checkpoints.RootDir, restoreFrom.Unix())
files, err := ms.FromCheckpoint(config.Keys.Checkpoints.RootDir, restoreFrom.Unix())
loadedData := ms.SizeInBytes() / 1024 / 1024 // In MB
if err != nil {
log.Fatalf("Loading checkpoints failed: %s\n", err.Error())
@ -205,20 +81,24 @@ func main() {
}
}()
intervals(&wg, ctx)
wg.Add(3)
memorystore.Retention(&wg, ctx)
memorystore.Checkpointing(&wg, ctx)
memorystore.Archiving(&wg, ctx)
wg.Add(1)
go func() {
err := api.StartApiServer(ctx, conf.HttpConfig)
err := api.StartApiServer(ctx, config.Keys.HttpConfig)
if err != nil {
log.Fatal(err)
}
wg.Done()
}()
if conf.Nats != nil {
for _, natsConf := range conf.Nats {
if config.Keys.Nats != nil {
for _, natsConf := range config.Keys.Nats {
// TODO: When multiple nats configs share a URL, do a single connect.
wg.Add(1)
nc := natsConf
@ -234,17 +114,5 @@ func main() {
}
wg.Wait()
log.Printf("Writing to '%s'...\n", conf.Checkpoints.RootDir)
files, err = ms.ToCheckpoint(conf.Checkpoints.RootDir, lastCheckpoint.Unix(), time.Now().Unix())
if err != nil {
log.Printf("Writing checkpoint failed: %s\n", err.Error())
}
log.Printf("Done! (%d files written)\n", files)
if closer, ok := debugDump.(io.Closer); ok {
if err := closer.Close(); err != nil {
log.Printf("error: %s", err.Error())
}
}
memorystore.Shutdown()
}

109
internal/api/api.go
View File

@ -27,9 +27,9 @@ import (
type ApiMetricData struct {
Error *string `json:"error,omitempty"`
Data util.FloatArray `json:"data,omitempty"`
From int64 `json:"from"`
To int64 `json:"to"`
Data util.FloatArray `json:"data,omitempty"`
Avg util.Float `json:"avg"`
Min util.Float `json:"min"`
Max util.Float `json:"max"`
@ -73,8 +73,8 @@ func (data *ApiMetricData) ScaleBy(f util.Float) {
}
}
func (data *ApiMetricData) PadDataWithNull(from, to int64, metric string) {
minfo, ok := memoryStore.metrics[metric]
func (data *ApiMetricData) PadDataWithNull(ms *memorystore.MemoryStore, from, to int64, metric string) {
minfo, ok := ms.Metrics[metric]
if !ok {
return
}
@ -105,12 +105,12 @@ func handleFree(rw http.ResponseWriter, r *http.Request) {
return
}
// TODO: lastCheckpoint might be modified by different go-routines.
// Load it using the sync/atomic package?
freeUpTo := lastCheckpoint.Unix()
if to < freeUpTo {
freeUpTo = to
}
// // TODO: lastCheckpoint might be modified by different go-routines.
// // Load it using the sync/atomic package?
// freeUpTo := lastCheckpoint.Unix()
// if to < freeUpTo {
// freeUpTo = to
// }
if r.Method != http.MethodPost {
http.Error(rw, "Method Not Allowed", http.StatusMethodNotAllowed)
@ -125,9 +125,10 @@ func handleFree(rw http.ResponseWriter, r *http.Request) {
return
}
ms := memorystore.GetMemoryStore()
n := 0
for _, sel := range selectors {
bn, err := memoryStore.Free(sel, freeUpTo)
bn, err := ms.Free(sel, to)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
@ -137,7 +138,7 @@ func handleFree(rw http.ResponseWriter, r *http.Request) {
}
rw.WriteHeader(http.StatusOK)
rw.Write([]byte(fmt.Sprintf("buffers freed: %d\n", n)))
fmt.Fprintf(rw, "buffers freed: %d\n", n)
}
func handleWrite(rw http.ResponseWriter, r *http.Request) {
@ -153,26 +154,9 @@ func handleWrite(rw http.ResponseWriter, r *http.Request) {
return
}
if debugDump != io.Discard {
now := time.Now()
msg := make([]byte, 0, 512)
msg = append(msg, "\n--- local unix time: "...)
msg = strconv.AppendInt(msg, now.Unix(), 10)
msg = append(msg, " ---\n"...)
debugDumpLock.Lock()
defer debugDumpLock.Unlock()
if _, err := debugDump.Write(msg); err != nil {
log.Printf("error while writing to debug dump: %s", err.Error())
}
if _, err := debugDump.Write(bytes); err != nil {
log.Printf("error while writing to debug dump: %s", err.Error())
}
return
}
ms := memorystore.GetMemoryStore()
dec := lineprotocol.NewDecoderWithBytes(bytes)
if err := decodeLine(dec, r.URL.Query().Get("cluster")); err != nil {
if err := decodeLine(dec, ms, r.URL.Query().Get("cluster")); err != nil {
log.Printf("/api/write error: %s", err.Error())
http.Error(rw, err.Error(), http.StatusBadRequest)
return
@ -182,13 +166,13 @@ func handleWrite(rw http.ResponseWriter, r *http.Request) {
type ApiQueryRequest struct {
Cluster string `json:"cluster"`
Queries []ApiQuery `json:"queries"`
ForAllNodes []string `json:"for-all-nodes"`
From int64 `json:"from"`
To int64 `json:"to"`
WithStats bool `json:"with-stats"`
WithData bool `json:"with-data"`
WithPadding bool `json:"with-padding"`
Queries []ApiQuery `json:"queries"`
ForAllNodes []string `json:"for-all-nodes"`
}
type ApiQueryResponse struct {
@ -197,19 +181,19 @@ type ApiQueryResponse struct {
}
type ApiQuery struct {
Type *string `json:"type,omitempty"`
SubType *string `json:"subtype,omitempty"`
Metric string `json:"metric"`
Hostname string `json:"host"`
Aggregate bool `json:"aggreg"`
ScaleFactor Float `json:"scale-by,omitempty"`
Type *string `json:"type,omitempty"`
TypeIds []string `json:"type-ids,omitempty"`
SubType *string `json:"subtype,omitempty"`
SubTypeIds []string `json:"subtype-ids,omitempty"`
ScaleFactor util.Float `json:"scale-by,omitempty"`
Aggregate bool `json:"aggreg"`
}
func handleQuery(rw http.ResponseWriter, r *http.Request) {
var err error
var req ApiQueryRequest = ApiQueryRequest{WithStats: true, WithData: true, WithPadding: true}
req := ApiQueryRequest{WithStats: true, WithData: true, WithPadding: true}
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
http.Error(rw, err.Error(), http.StatusBadRequest)
return
@ -235,29 +219,29 @@ func handleQuery(rw http.ResponseWriter, r *http.Request) {
}
for _, query := range req.Queries {
sels := make([]Selector, 0, 1)
sels := make([]util.Selector, 0, 1)
if query.Aggregate || query.Type == nil {
sel := Selector{{String: req.Cluster}, {String: query.Hostname}}
sel := util.Selector{{String: req.Cluster}, {String: query.Hostname}}
if query.Type != nil {
if len(query.TypeIds) == 1 {
sel = append(sel, SelectorElement{String: *query.Type + query.TypeIds[0]})
sel = append(sel, util.SelectorElement{String: *query.Type + query.TypeIds[0]})
} else {
ids := make([]string, len(query.TypeIds))
for i, id := range query.TypeIds {
ids[i] = *query.Type + id
}
sel = append(sel, SelectorElement{Group: ids})
sel = append(sel, util.SelectorElement{Group: ids})
}
if query.SubType != nil {
if len(query.SubTypeIds) == 1 {
sel = append(sel, SelectorElement{String: *query.SubType + query.SubTypeIds[0]})
sel = append(sel, util.SelectorElement{String: *query.SubType + query.SubTypeIds[0]})
} else {
ids := make([]string, len(query.SubTypeIds))
for i, id := range query.SubTypeIds {
ids[i] = *query.SubType + id
}
sel = append(sel, SelectorElement{Group: ids})
sel = append(sel, util.SelectorElement{Group: ids})
}
}
}
@ -266,7 +250,7 @@ func handleQuery(rw http.ResponseWriter, r *http.Request) {
for _, typeId := range query.TypeIds {
if query.SubType != nil {
for _, subTypeId := range query.SubTypeIds {
sels = append(sels, Selector{
sels = append(sels, util.Selector{
{String: req.Cluster},
{String: query.Hostname},
{String: *query.Type + typeId},
@ -274,7 +258,7 @@ func handleQuery(rw http.ResponseWriter, r *http.Request) {
})
}
} else {
sels = append(sels, Selector{
sels = append(sels, util.Selector{
{String: req.Cluster},
{String: query.Hostname},
{String: *query.Type + typeId},
@ -289,7 +273,7 @@ func handleQuery(rw http.ResponseWriter, r *http.Request) {
res := make([]ApiMetricData, 0, len(sels))
for _, sel := range sels {
data := ApiMetricData{}
data.Data, data.From, data.To, err = memoryStore.Read(sel, query.Metric, req.From, req.To)
data.Data, data.From, data.To, err = ms.Read(sel, query.Metric, req.From, req.To)
// log.Printf("data: %#v, %#v, %#v, %#v", data.Data, data.From, data.To, err)
if err != nil {
msg := err.Error()
@ -305,7 +289,7 @@ func handleQuery(rw http.ResponseWriter, r *http.Request) {
data.ScaleBy(query.ScaleFactor)
}
if req.WithPadding {
data.PadDataWithNull(req.From, req.To, query.Metric)
data.PadDataWithNull(ms, req.From, req.To, query.Metric)
}
if !req.WithData {
data.Data = nil
@ -324,6 +308,20 @@ func handleQuery(rw http.ResponseWriter, r *http.Request) {
}
}
func handleDebug(rw http.ResponseWriter, r *http.Request) {
raw := r.URL.Query().Get("selector")
selector := []string{}
if len(raw) != 0 {
selector = strings.Split(raw, ":")
}
ms := memorystore.GetMemoryStore()
if err := ms.DebugDump(bufio.NewWriter(rw), selector); err != nil {
rw.WriteHeader(http.StatusBadRequest)
rw.Write([]byte(err.Error()))
}
}
func authentication(next http.Handler, publicKey ed25519.PublicKey) http.Handler {
cacheLock := sync.RWMutex{}
cache := map[string]*jwt.Token{}
@ -375,18 +373,7 @@ func StartApiServer(ctx context.Context, httpConfig *config.HttpConfig) error {
r.HandleFunc("/api/free", handleFree)
r.HandleFunc("/api/write", handleWrite)
r.HandleFunc("/api/query", handleQuery)
r.HandleFunc("/api/debug", func(rw http.ResponseWriter, r *http.Request) {
raw := r.URL.Query().Get("selector")
selector := []string{}
if len(raw) != 0 {
selector = strings.Split(raw, ":")
}
if err := memoryStore.DebugDump(bufio.NewWriter(rw), selector); err != nil {
rw.WriteHeader(http.StatusBadRequest)
rw.Write([]byte(err.Error()))
}
})
r.HandleFunc("/api/debug", handleDebug)
server := &http.Server{
Handler: r,
@ -395,8 +382,8 @@ func StartApiServer(ctx context.Context, httpConfig *config.HttpConfig) error {
ReadTimeout: 30 * time.Second,
}
if len(conf.JwtPublicKey) > 0 {
buf, err := base64.StdEncoding.DecodeString(conf.JwtPublicKey)
if len(config.Keys.JwtPublicKey) > 0 {
buf, err := base64.StdEncoding.DecodeString(config.Keys.JwtPublicKey)
if err != nil {
return err
}

2
internal/api/lineprotocol.go
View File

@ -191,7 +191,7 @@ func decodeLine(dec *lineprotocol.Decoder,
// cluster and host. By using `WriteToLevel` (level = host), we do not need
// to take the root- and cluster-level lock as often.
var lvl *memorystore.Level = nil
var prevCluster, prevHost string = "", ""
prevCluster, prevHost := "", ""
var ok bool
for dec.Next() {

8
internal/config/config.go
View File

@ -96,8 +96,9 @@ type Config struct {
Nats []*NatsConfig `json:"nats"`
}
func LoadConfiguration(file string) Config {
var config Config
var Keys Config
func Init(file string) {
configFile, err := os.Open(file)
if err != nil {
log.Fatal(err)
@ -105,8 +106,7 @@ func LoadConfiguration(file string) Config {
defer configFile.Close()
dec := json.NewDecoder(configFile)
dec.DisallowUnknownFields()
if err := dec.Decode(&config); err != nil {
if err := dec.Decode(&Keys); err != nil {
log.Fatal(err)
}
return config
}

473
internal/memorystore/archive.go
View File

@ -3,470 +3,57 @@ package memorystore
import (
"archive/zip"
"bufio"
"encoding/json"
"context"
"errors"
"fmt"
"io"
"io/fs"
"log"
"os"
"path"
"path/filepath"
"runtime"
"sort"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/ClusterCockpit/cc-metric-store/internal/config"
)
// Whenever changed, update MarshalJSON as well!
type CheckpointMetrics struct {
Frequency int64 `json:"frequency"`
Start int64 `json:"start"`
Data []Float `json:"data"`
func Archiving(wg *sync.WaitGroup, ctx context.Context) {
go func() {
defer wg.Done()
d, err := time.ParseDuration(config.Keys.Archive.Interval)
if err != nil {
log.Fatal(err)
}
if d <= 0 {
return
}
// As `Float` implements a custom MarshalJSON() function,
// serializing an array of such types has more overhead
// than one would assume (because of extra allocations, interfaces and so on).
func (cm *CheckpointMetrics) MarshalJSON() ([]byte, error) {
buf := make([]byte, 0, 128+len(cm.Data)*8)
buf = append(buf, `{"frequency":`...)
buf = strconv.AppendInt(buf, cm.Frequency, 10)
buf = append(buf, `,"start":`...)
buf = strconv.AppendInt(buf, cm.Start, 10)
buf = append(buf, `,"data":[`...)
for i, x := range cm.Data {
if i != 0 {
buf = append(buf, ',')
ticks := func() <-chan time.Time {
if d <= 0 {
return nil
}
if x.IsNaN() {
buf = append(buf, `null`...)
return time.NewTicker(d).C
}()
for {
select {
case <-ctx.Done():
return
case <-ticks:
t := time.Now().Add(-d)
log.Printf("start archiving checkpoints (older than %s)...\n", t.Format(time.RFC3339))
n, err := ArchiveCheckpoints(config.Keys.Checkpoints.RootDir, config.Keys.Archive.RootDir, t.Unix(), config.Keys.Archive.DeleteInstead)
if err != nil {
log.Printf("archiving failed: %s\n", err.Error())
} else {
buf = strconv.AppendFloat(buf, float64(x), 'f', 1, 32)
log.Printf("done: %d files zipped and moved to archive\n", n)
}
}
buf = append(buf, `]}`...)
return buf, nil
}
type CheckpointFile struct {
From int64 `json:"from"`
To int64 `json:"to"`
Metrics map[string]*CheckpointMetrics `json:"metrics"`
Children map[string]*CheckpointFile `json:"children"`
}()
}
var ErrNoNewData error = errors.New("all data already archived")
var NumWorkers int = 4
func init() {
maxWorkers := 10
NumWorkers = runtime.NumCPU()/2 + 1
if NumWorkers > maxWorkers {
NumWorkers = maxWorkers
}
}
// Metrics stored at the lowest 2 levels are not stored away (root and cluster)!
// On a per-host basis a new JSON file is created. I have no idea if this will scale.
// The good thing: Only a host at a time is locked, so this function can run
// in parallel to writes/reads.
func (m *MemoryStore) ToCheckpoint(dir string, from, to int64) (int, error) {
levels := make([]*Level, 0)
selectors := make([][]string, 0)
m.root.lock.RLock()
for sel1, l1 := range m.root.children {
l1.lock.RLock()
for sel2, l2 := range l1.children {
levels = append(levels, l2)
selectors = append(selectors, []string{sel1, sel2})
}
l1.lock.RUnlock()
}
m.root.lock.RUnlock()
type workItem struct {
level *Level
dir string
selector []string
}
n, errs := int32(0), int32(0)
var wg sync.WaitGroup
wg.Add(NumWorkers)
work := make(chan workItem, NumWorkers*2)
for worker := 0; worker < NumWorkers; worker++ {
go func() {
defer wg.Done()
for workItem := range work {
if err := workItem.level.toCheckpoint(workItem.dir, from, to, m); err != nil {
if err == ErrNoNewData {
continue
}
log.Printf("error while checkpointing %#v: %s", workItem.selector, err.Error())
atomic.AddInt32(&errs, 1)
} else {
atomic.AddInt32(&n, 1)
}
}
}()
}
for i := 0; i < len(levels); i++ {
dir := path.Join(dir, path.Join(selectors[i]...))
work <- workItem{
level: levels[i],
dir: dir,
selector: selectors[i],
}
}
close(work)
wg.Wait()
if errs > 0 {
return int(n), fmt.Errorf("%d errors happend while creating checkpoints (%d successes)", errs, n)
}
return int(n), nil
}
func (l *Level) toCheckpointFile(from, to int64, m *MemoryStore) (*CheckpointFile, error) {
l.lock.RLock()
defer l.lock.RUnlock()
retval := &CheckpointFile{
From: from,
To: to,
Metrics: make(map[string]*CheckpointMetrics),
Children: make(map[string]*CheckpointFile),
}
for metric, minfo := range m.Metrics {
b := l.metrics[minfo.offset]
if b == nil {
continue
}
allArchived := true
b.iterFromTo(from, to, func(b *buffer) error {
if !b.archived {
allArchived = false
}
return nil
})
if allArchived {
continue
}
data := make([]Float, (to-from)/b.frequency+1)
data, start, end, err := b.read(from, to, data)
if err != nil {
return nil, err
}
for i := int((end - start) / b.frequency); i < len(data); i++ {
data[i] = NaN
}
retval.Metrics[metric] = &CheckpointMetrics{
Frequency: b.frequency,
Start: start,
Data: data,
}
}
for name, child := range l.children {
val, err := child.toCheckpointFile(from, to, m)
if err != nil {
return nil, err
}
if val != nil {
retval.Children[name] = val
}
}
if len(retval.Children) == 0 && len(retval.Metrics) == 0 {
return nil, nil
}
return retval, nil
}
func (l *Level) toCheckpoint(dir string, from, to int64, m *MemoryStore) error {
cf, err := l.toCheckpointFile(from, to, m)
if err != nil {
return err
}
if cf == nil {
return ErrNoNewData
}
filepath := path.Join(dir, fmt.Sprintf("%d.json", from))
f, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY, 0o644)
if err != nil && os.IsNotExist(err) {
err = os.MkdirAll(dir, 0o755)
if err == nil {
f, err = os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY, 0o644)
}
}
if err != nil {
return err
}
defer f.Close()
bw := bufio.NewWriter(f)
if err = json.NewEncoder(bw).Encode(cf); err != nil {
return err
}
return bw.Flush()
}
// Metrics stored at the lowest 2 levels are not loaded (root and cluster)!
// This function can only be called once and before the very first write or read.
// Different host's data is loaded to memory in parallel.
func (m *MemoryStore) FromCheckpoint(dir string, from int64) (int, error) {
var wg sync.WaitGroup
work := make(chan [2]string, NumWorkers)
n, errs := int32(0), int32(0)
wg.Add(NumWorkers)
for worker := 0; worker < NumWorkers; worker++ {
go func() {
defer wg.Done()
for host := range work {
lvl := m.root.findLevelOrCreate(host[:], len(m.Metrics))
nn, err := lvl.fromCheckpoint(filepath.Join(dir, host[0], host[1]), from, m)
if err != nil {
log.Fatalf("error while loading checkpoints: %s", err.Error())
atomic.AddInt32(&errs, 1)
}
atomic.AddInt32(&n, int32(nn))
}
}()
}
i := 0
clustersDir, err := os.ReadDir(dir)
for _, clusterDir := range clustersDir {
if !clusterDir.IsDir() {
err = errors.New("expected only directories at first level of checkpoints/ directory")
goto done
}
hostsDir, e := os.ReadDir(filepath.Join(dir, clusterDir.Name()))
if e != nil {
err = e
goto done
}
for _, hostDir := range hostsDir {
if !hostDir.IsDir() {
err = errors.New("expected only directories at second level of checkpoints/ directory")
goto done
}
i++
if i%NumWorkers == 0 && i > 100 {
// Forcing garbage collection runs here regulary during the loading of checkpoints
// will decrease the total heap size after loading everything back to memory is done.
// While loading data, the heap will grow fast, so the GC target size will double
// almost always. By forcing GCs here, we can keep it growing more slowly so that
// at the end, less memory is wasted.
runtime.GC()
}
work <- [2]string{clusterDir.Name(), hostDir.Name()}
}
}
done:
close(work)
wg.Wait()
if err != nil {
return int(n), err
}
if errs > 0 {
return int(n), fmt.Errorf("%d errors happend while creating checkpoints (%d successes)", errs, n)
}
return int(n), nil
}
func (l *Level) loadFile(cf *CheckpointFile, m *MemoryStore) error {
for name, metric := range cf.Metrics {
n := len(metric.Data)
b := &buffer{
frequency: metric.Frequency,
start: metric.Start,
data: metric.Data[0:n:n], // Space is wasted here :(
prev: nil,
next: nil,
archived: true,
}
b.close()
minfo, ok := m.Metrics[name]
if !ok {
continue
// return errors.New("Unkown metric: " + name)
}
prev := l.metrics[minfo.offset]
if prev == nil {
l.metrics[minfo.offset] = b
} else {
if prev.start > b.start {
return errors.New("wooops")
}
b.prev = prev
prev.next = b
}
l.metrics[minfo.offset] = b
}
if len(cf.Children) > 0 && l.children == nil {
l.children = make(map[string]*Level)
}
for sel, childCf := range cf.Children {
child, ok := l.children[sel]
if !ok {
child = &Level{
metrics: make([]*buffer, len(m.Metrics)),
children: nil,
}
l.children[sel] = child
}
if err := child.loadFile(childCf, m); err != nil {
return err
}
}
return nil
}
func (l *Level) fromCheckpoint(dir string, from int64, m *MemoryStore) (int, error) {
direntries, err := os.ReadDir(dir)
if err != nil {
if os.IsNotExist(err) {
return 0, nil
}
return 0, err
}
jsonFiles := make([]fs.DirEntry, 0)
filesLoaded := 0
for _, e := range direntries {
if e.IsDir() {
child := &Level{
metrics: make([]*buffer, len(m.Metrics)),
children: make(map[string]*Level),
}
files, err := child.fromCheckpoint(path.Join(dir, e.Name()), from, m)
filesLoaded += files
if err != nil {
return filesLoaded, err
}
l.children[e.Name()] = child
} else if strings.HasSuffix(e.Name(), ".json") {
jsonFiles = append(jsonFiles, e)
} else {
return filesLoaded, errors.New("unexpected file: " + dir + "/" + e.Name())
}
}
files, err := findFiles(jsonFiles, from, true)
if err != nil {
return filesLoaded, err
}
for _, filename := range files {
f, err := os.Open(path.Join(dir, filename))
if err != nil {
return filesLoaded, err
}
defer f.Close()
br := bufio.NewReader(f)
cf := &CheckpointFile{}
if err = json.NewDecoder(br).Decode(cf); err != nil {
return filesLoaded, err
}
if cf.To != 0 && cf.To < from {
continue
}
if err = l.loadFile(cf, m); err != nil {
return filesLoaded, err
}
filesLoaded += 1
}
return filesLoaded, nil
}
// This will probably get very slow over time!
// A solution could be some sort of an index file in which all other files
// and the timespan they contain is listed.
func findFiles(direntries []fs.DirEntry, t int64, findMoreRecentFiles bool) ([]string, error) {
nums := map[string]int64{}
for _, e := range direntries {
ts, err := strconv.ParseInt(strings.TrimSuffix(e.Name(), ".json"), 10, 64)
if err != nil {
return nil, err
}
nums[e.Name()] = ts
}
sort.Slice(direntries, func(i, j int) bool {
a, b := direntries[i], direntries[j]
return nums[a.Name()] < nums[b.Name()]
})
filenames := make([]string, 0)
for i := 0; i < len(direntries); i++ {
e := direntries[i]
ts1 := nums[e.Name()]
if findMoreRecentFiles && t <= ts1 || i == len(direntries)-1 {
filenames = append(filenames, e.Name())
continue
}
enext := direntries[i+1]
ts2 := nums[enext.Name()]
if findMoreRecentFiles {
if ts1 < t && t < ts2 {
filenames = append(filenames, e.Name())
}
} else {
if ts2 < t {
filenames = append(filenames, e.Name())
}
}
}
return filenames, nil
}
// ZIP all checkpoint files older than `from` together and write them to the `archiveDir`,
// deleting them from the `checkpointsDir`.
func ArchiveCheckpoints(checkpointsDir, archiveDir string, from int64, deleteInstead bool) (int, error) {

24
internal/memorystore/buffer.go
View File

@ -34,21 +34,13 @@ var (
// If `cap(data)` is reached, a new buffer is created and
// becomes the new head of a buffer list.
type buffer struct {
frequency int64 // Time between two "slots"
start int64 // Timestamp of when `data[0]` was written.
data []util.Float // The slice should never reallocacte as `cap(data)` is respected.
prev, next *buffer // `prev` contains older data, `next` newer data.
archived bool // If true, this buffer is already archived
prev *buffer
next *buffer
data []util.Float
frequency int64
start int64
archived bool
closed bool
/*
statisticts struct {
samples int
min Float
max Float
avg Float
}
*/
}
func newBuffer(ts, freq int64) *buffer {
@ -163,8 +155,8 @@ func (b *buffer) read(from, to int64, data []util.Float) ([]util.Float, int64, i
from = b.firstWrite()
}
var i int = 0
var t int64 = from
i := 0
t := from
for ; t < to; t += b.frequency {
idx := int((t - b.start) / b.frequency)
if idx >= cap(b.data) {

501
internal/memorystore/checkpoint.go Normal file
View File

@ -0,0 +1,501 @@
package memorystore
import (
"bufio"
"context"
"encoding/json"
"errors"
"fmt"
"io/fs"
"log"
"os"
"path"
"path/filepath"
"runtime"
"sort"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/ClusterCockpit/cc-metric-store/internal/config"
"github.com/ClusterCockpit/cc-metric-store/internal/util"
)
// Whenever changed, update MarshalJSON as well!
type CheckpointMetrics struct {
Data []util.Float `json:"data"`
Frequency int64 `json:"frequency"`
Start int64 `json:"start"`
}
type CheckpointFile struct {
Metrics map[string]*CheckpointMetrics `json:"metrics"`
Children map[string]*CheckpointFile `json:"children"`
From int64 `json:"from"`
To int64 `json:"to"`
}
var lastCheckpoint time.Time
func Checkpointing(wg *sync.WaitGroup, ctx context.Context) {
lastCheckpoint = time.Now()
ms := GetMemoryStore()
go func() {
defer wg.Done()
d, err := time.ParseDuration(config.Keys.Checkpoints.Interval)
if err != nil {
log.Fatal(err)
}
if d <= 0 {
return
}
ticks := func() <-chan time.Time {
if d <= 0 {
return nil
}
return time.NewTicker(d).C
}()
for {
select {
case <-ctx.Done():
return
case <-ticks:
log.Printf("start checkpointing (starting at %s)...\n", lastCheckpoint.Format(time.RFC3339))
now := time.Now()
n, err := ms.ToCheckpoint(config.Keys.Checkpoints.RootDir,
lastCheckpoint.Unix(), now.Unix())
if err != nil {
log.Printf("checkpointing failed: %s\n", err.Error())
} else {
log.Printf("done: %d checkpoint files created\n", n)
lastCheckpoint = now
}
}
}
}()
}
// As `Float` implements a custom MarshalJSON() function,
// serializing an array of such types has more overhead
// than one would assume (because of extra allocations, interfaces and so on).
func (cm *CheckpointMetrics) MarshalJSON() ([]byte, error) {
buf := make([]byte, 0, 128+len(cm.Data)*8)
buf = append(buf, `{"frequency":`...)
buf = strconv.AppendInt(buf, cm.Frequency, 10)
buf = append(buf, `,"start":`...)
buf = strconv.AppendInt(buf, cm.Start, 10)
buf = append(buf, `,"data":[`...)
for i, x := range cm.Data {
if i != 0 {
buf = append(buf, ',')
}
if x.IsNaN() {
buf = append(buf, `null`...)
} else {
buf = strconv.AppendFloat(buf, float64(x), 'f', 1, 32)
}
}
buf = append(buf, `]}`...)
return buf, nil
}
// Metrics stored at the lowest 2 levels are not stored away (root and cluster)!
// On a per-host basis a new JSON file is created. I have no idea if this will scale.
// The good thing: Only a host at a time is locked, so this function can run
// in parallel to writes/reads.
func (m *MemoryStore) ToCheckpoint(dir string, from, to int64) (int, error) {
levels := make([]*Level, 0)
selectors := make([][]string, 0)
m.root.lock.RLock()
for sel1, l1 := range m.root.children {
l1.lock.RLock()
for sel2, l2 := range l1.children {
levels = append(levels, l2)
selectors = append(selectors, []string{sel1, sel2})
}
l1.lock.RUnlock()
}
m.root.lock.RUnlock()
type workItem struct {
level *Level
dir string
selector []string
}
n, errs := int32(0), int32(0)
var wg sync.WaitGroup
wg.Add(NumWorkers)
work := make(chan workItem, NumWorkers*2)
for worker := 0; worker < NumWorkers; worker++ {
go func() {
defer wg.Done()
for workItem := range work {
if err := workItem.level.toCheckpoint(workItem.dir, from, to, m); err != nil {
if err == ErrNoNewData {
continue
}
log.Printf("error while checkpointing %#v: %s", workItem.selector, err.Error())
atomic.AddInt32(&errs, 1)
} else {
atomic.AddInt32(&n, 1)
}
}
}()
}
for i := 0; i < len(levels); i++ {
dir := path.Join(dir, path.Join(selectors[i]...))
work <- workItem{
level: levels[i],
dir: dir,
selector: selectors[i],
}
}
close(work)
wg.Wait()
if errs > 0 {
return int(n), fmt.Errorf("%d errors happend while creating checkpoints (%d successes)", errs, n)
}
return int(n), nil
}
func (l *Level) toCheckpointFile(from, to int64, m *MemoryStore) (*CheckpointFile, error) {
l.lock.RLock()
defer l.lock.RUnlock()
retval := &CheckpointFile{
From: from,
To: to,
Metrics: make(map[string]*CheckpointMetrics),
Children: make(map[string]*CheckpointFile),
}
for metric, minfo := range m.Metrics {
b := l.metrics[minfo.Offset]
if b == nil {
continue
}
allArchived := true
b.iterFromTo(from, to, func(b *buffer) error {
if !b.archived {
allArchived = false
}
return nil
})
if allArchived {
continue
}
data := make([]util.Float, (to-from)/b.frequency+1)
data, start, end, err := b.read(from, to, data)
if err != nil {
return nil, err
}
for i := int((end - start) / b.frequency); i < len(data); i++ {
data[i] = util.NaN
}
retval.Metrics[metric] = &CheckpointMetrics{
Frequency: b.frequency,
Start: start,
Data: data,
}
}
for name, child := range l.children {
val, err := child.toCheckpointFile(from, to, m)
if err != nil {
return nil, err
}
if val != nil {
retval.Children[name] = val
}
}
if len(retval.Children) == 0 && len(retval.Metrics) == 0 {
return nil, nil
}
return retval, nil
}
func (l *Level) toCheckpoint(dir string, from, to int64, m *MemoryStore) error {
cf, err := l.toCheckpointFile(from, to, m)
if err != nil {
return err
}
if cf == nil {
return ErrNoNewData
}
filepath := path.Join(dir, fmt.Sprintf("%d.json", from))
f, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY, 0o644)
if err != nil && os.IsNotExist(err) {
err = os.MkdirAll(dir, 0o755)
if err == nil {
f, err = os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY, 0o644)
}
}
if err != nil {
return err
}
defer f.Close()
bw := bufio.NewWriter(f)
if err = json.NewEncoder(bw).Encode(cf); err != nil {
return err
}
return bw.Flush()
}
// Metrics stored at the lowest 2 levels are not loaded (root and cluster)!
// This function can only be called once and before the very first write or read.
// Different host's data is loaded to memory in parallel.
func (m *MemoryStore) FromCheckpoint(dir string, from int64) (int, error) {
var wg sync.WaitGroup
work := make(chan [2]string, NumWorkers)
n, errs := int32(0), int32(0)
wg.Add(NumWorkers)
for worker := 0; worker < NumWorkers; worker++ {
go func() {
defer wg.Done()
for host := range work {
lvl := m.root.findLevelOrCreate(host[:], len(m.Metrics))
nn, err := lvl.fromCheckpoint(filepath.Join(dir, host[0], host[1]), from, m)
if err != nil {
log.Fatalf("error while loading checkpoints: %s", err.Error())
atomic.AddInt32(&errs, 1)
}
atomic.AddInt32(&n, int32(nn))
}
}()
}
i := 0
clustersDir, err := os.ReadDir(dir)
for _, clusterDir := range clustersDir {
if !clusterDir.IsDir() {
err = errors.New("expected only directories at first level of checkpoints/ directory")
goto done
}
hostsDir, e := os.ReadDir(filepath.Join(dir, clusterDir.Name()))
if e != nil {
err = e
goto done
}
for _, hostDir := range hostsDir {
if !hostDir.IsDir() {
err = errors.New("expected only directories at second level of checkpoints/ directory")
goto done
}
i++
if i%NumWorkers == 0 && i > 100 {
// Forcing garbage collection runs here regulary during the loading of checkpoints
// will decrease the total heap size after loading everything back to memory is done.
// While loading data, the heap will grow fast, so the GC target size will double
// almost always. By forcing GCs here, we can keep it growing more slowly so that
// at the end, less memory is wasted.
runtime.GC()
}
work <- [2]string{clusterDir.Name(), hostDir.Name()}
}
}
done:
close(work)
wg.Wait()
if err != nil {
return int(n), err
}
if errs > 0 {
return int(n), fmt.Errorf("%d errors happend while creating checkpoints (%d successes)", errs, n)
}
return int(n), nil
}
func (l *Level) loadFile(cf *CheckpointFile, m *MemoryStore) error {
for name, metric := range cf.Metrics {
n := len(metric.Data)
b := &buffer{
frequency: metric.Frequency,
start: metric.Start,
data: metric.Data[0:n:n], // Space is wasted here :(
prev: nil,
next: nil,
archived: true,
}
b.close()
minfo, ok := m.Metrics[name]
if !ok {
continue
// return errors.New("Unkown metric: " + name)
}
prev := l.metrics[minfo.Offset]
if prev == nil {
l.metrics[minfo.Offset] = b
} else {
if prev.start > b.start {
return errors.New("wooops")
}
b.prev = prev
prev.next = b
}
l.metrics[minfo.Offset] = b
}
if len(cf.Children) > 0 && l.children == nil {
l.children = make(map[string]*Level)
}
for sel, childCf := range cf.Children {
child, ok := l.children[sel]
if !ok {
child = &Level{
metrics: make([]*buffer, len(m.Metrics)),
children: nil,
}
l.children[sel] = child
}
if err := child.loadFile(childCf, m); err != nil {
return err
}
}
return nil
}
func (l *Level) fromCheckpoint(dir string, from int64, m *MemoryStore) (int, error) {
direntries, err := os.ReadDir(dir)
if err != nil {
if os.IsNotExist(err) {
return 0, nil
}
return 0, err
}
jsonFiles := make([]fs.DirEntry, 0)
filesLoaded := 0
for _, e := range direntries {
if e.IsDir() {
child := &Level{
metrics: make([]*buffer, len(m.Metrics)),
children: make(map[string]*Level),
}
files, err := child.fromCheckpoint(path.Join(dir, e.Name()), from, m)
filesLoaded += files
if err != nil {
return filesLoaded, err
}
l.children[e.Name()] = child
} else if strings.HasSuffix(e.Name(), ".json") {
jsonFiles = append(jsonFiles, e)
} else {
return filesLoaded, errors.New("unexpected file: " + dir + "/" + e.Name())
}
}
files, err := findFiles(jsonFiles, from, true)
if err != nil {
return filesLoaded, err
}
for _, filename := range files {
f, err := os.Open(path.Join(dir, filename))
if err != nil {
return filesLoaded, err
}
defer f.Close()
br := bufio.NewReader(f)
cf := &CheckpointFile{}
if err = json.NewDecoder(br).Decode(cf); err != nil {
return filesLoaded, err
}
if cf.To != 0 && cf.To < from {
continue
}
if err = l.loadFile(cf, m); err != nil {
return filesLoaded, err
}
filesLoaded += 1
}
return filesLoaded, nil
}
// This will probably get very slow over time!
// A solution could be some sort of an index file in which all other files
// and the timespan they contain is listed.
func findFiles(direntries []fs.DirEntry, t int64, findMoreRecentFiles bool) ([]string, error) {
nums := map[string]int64{}
for _, e := range direntries {
ts, err := strconv.ParseInt(strings.TrimSuffix(e.Name(), ".json"), 10, 64)
if err != nil {
return nil, err
}
nums[e.Name()] = ts
}
sort.Slice(direntries, func(i, j int) bool {
a, b := direntries[i], direntries[j]
return nums[a.Name()] < nums[b.Name()]
})
filenames := make([]string, 0)
for i := 0; i < len(direntries); i++ {
e := direntries[i]
ts1 := nums[e.Name()]
if findMoreRecentFiles && t <= ts1 || i == len(direntries)-1 {
filenames = append(filenames, e.Name())
continue
}
enext := direntries[i+1]
ts2 := nums[enext.Name()]
if findMoreRecentFiles {
if ts1 < t && t < ts2 {
filenames = append(filenames, e.Name())
}
} else {
if ts2 < t {
filenames = append(filenames, e.Name())
}
}
}
return filenames, nil
}

2
internal/memorystore/debug.go
View File

@ -41,7 +41,7 @@ func (l *Level) debugDump(m *MemoryStore, w *bufio.Writer, lvlname string, buf [
depth += 1
objitems := 0
for name, mc := range m.Metrics {
if b := l.metrics[mc.offset]; b != nil {
if b := l.metrics[mc.Offset]; b != nil {
for i := 0; i < depth; i++ {
buf = append(buf, '\t')
}

6
internal/memorystore/level.go
View File

@ -12,9 +12,9 @@ import (
// Can be both a leaf or a inner node. In this tree structue, inner nodes can
// also hold data (in `metrics`).
type Level struct {
children map[string]*Level
metrics []*buffer
lock sync.RWMutex
metrics []*buffer // Every level can store metrics.
children map[string]*Level // Lower levels.
}
// Find the correct level for the given selector, creating it if
@ -126,7 +126,7 @@ func (l *Level) findLevel(selector []string) *Level {
return lvl.findLevel(selector[1:])
}
func (l *Level) findBuffers(selector Selector, offset int, f func(b *buffer) error) error {
func (l *Level) findBuffers(selector util.Selector, offset int, f func(b *buffer) error) error {
l.lock.RLock()
defer l.lock.RUnlock()

65
internal/memorystore/memorystore.go
View File

@ -1,9 +1,12 @@
package memorystore
import (
"context"
"errors"
"log"
"runtime"
"sync"
"time"
"github.com/ClusterCockpit/cc-metric-store/internal/config"
"github.com/ClusterCockpit/cc-metric-store/internal/util"
@ -14,6 +17,16 @@ var (
msInstance *MemoryStore
)
var NumWorkers int = 4
func init() {
maxWorkers := 10
NumWorkers = runtime.NumCPU()/2 + 1
if NumWorkers > maxWorkers {
NumWorkers = maxWorkers
}
}
type Metric struct {
Name string
Value util.Float
@ -21,8 +34,8 @@ type Metric struct {
}
type MemoryStore struct {
root Level // root of the tree structure
Metrics map[string]config.MetricConfig
root Level
}
// Create a new, initialized instance of a MemoryStore.
@ -61,6 +74,54 @@ func GetMemoryStore() *MemoryStore {
return msInstance
}
func Shutdown() {
ms := GetMemoryStore()
log.Printf("Writing to '%s'...\n", config.Keys.Checkpoints.RootDir)
files, err := ms.ToCheckpoint(config.Keys.Checkpoints.RootDir, lastCheckpoint.Unix(), time.Now().Unix())
if err != nil {
log.Printf("Writing checkpoint failed: %s\n", err.Error())
}
log.Printf("Done! (%d files written)\n", files)
}
func Retention(wg *sync.WaitGroup, ctx context.Context) {
ms := GetMemoryStore()
go func() {
defer wg.Done()
d, err := time.ParseDuration(config.Keys.RetentionInMemory)
if err != nil {
log.Fatal(err)
}
if d <= 0 {
return
}
ticks := func() <-chan time.Time {
d := d / 2
if d <= 0 {
return nil
}
return time.NewTicker(d).C
}()
for {
select {
case <-ctx.Done():
return
case <-ticks:
t := time.Now().Add(-d)
log.Printf("start freeing buffers (older than %s)...\n", t.Format(time.RFC3339))
freed, err := ms.Free(nil, t.Unix())
if err != nil {
log.Printf("freeing up buffers failed: %s\n", err.Error())
} else {
log.Printf("done: %d buffers freed\n", freed)
}
}
}
}()
}
// Write all values in `metrics` to the level specified by `selector` for time `ts`.
// Look at `findLevelOrCreate` for how selectors work.
func (m *MemoryStore) Write(selector []string, ts int64, metrics []Metric) error {
@ -117,7 +178,7 @@ func (m *MemoryStore) WriteToLevel(l *Level, selector []string, ts int64, metric
// If the level does not hold the metric itself, the data will be aggregated recursively from the children.
// The second and third return value are the actual from/to for the data. Those can be different from
// the range asked for if no data was available.
func (m *MemoryStore) Read(selector Selector, metric string, from, to int64) ([]util.Float, int64, int64, error) {
func (m *MemoryStore) Read(selector util.Selector, metric string, from, to int64) ([]util.Float, int64, int64, error) {
if from > to {
return nil, 0, 0, errors.New("invalid time range")
}

2
internal/memorystore/stats.go
View File

@ -66,7 +66,7 @@ func (b *buffer) stats(from, to int64) (Stats, int64, int64, error) {
// Returns statistics for the requested metric on the selected node/level.
// Data is aggregated to the selected level the same way as in `MemoryStore.Read`.
// If `Stats.Samples` is zero, the statistics should not be considered as valid.
func (m *MemoryStore) Stats(selector Selector, metric string, from, to int64) (*Stats, int64, int64, error) {
func (m *MemoryStore) Stats(selector util.Selector, metric string, from, to int64) (*Stats, int64, int64, error) {
if from > to {
return nil, 0, 0, errors.New("invalid time range")
}

4
internal/memorystore/selector.go → internal/util/selector.go
View File

@ -1,4 +1,4 @@
package memorystore
package util
import (
"encoding/json"
@ -6,9 +6,9 @@ import (
)
type SelectorElement struct {
Any bool
String string
Group []string
Any bool
}
func (se *SelectorElement) UnmarshalJSON(input []byte) error {