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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package document | ||
|
|
||
| import ( | ||
| "io/ioutil" | ||
| "os" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/pingcap/ng-monitoring/utils/testutil" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func TestGC(t *testing.T) { | ||
| tmpDir, err := ioutil.TempDir(os.TempDir(), "ngm-test-.*") | ||
| require.NoError(t, err) | ||
| defer func() { | ||
| err := os.RemoveAll(tmpDir) | ||
| require.NoError(t, err) | ||
| }() | ||
|
|
||
| db := testutil.NewBadgerDB(t, tmpDir) | ||
| ts, err := getLastFlattenTs(db) | ||
| require.NoError(t, err) | ||
| require.Equal(t, int64(0), ts) | ||
|
|
||
| ts = time.Now().Unix() | ||
| err = storeLastFlattenTs(db, ts) | ||
| require.NoError(t, err) | ||
|
|
||
| lastTs, err := getLastFlattenTs(db) | ||
| require.NoError(t, err) | ||
| require.Equal(t, ts, lastTs) | ||
|
|
||
| require.False(t, needFlatten(db)) | ||
| runGC(db) | ||
|
|
||
| lastTs = ts - int64(flattenInterval/time.Second) | ||
| err = storeLastFlattenTs(db, lastTs) | ||
| require.NoError(t, err) | ||
| require.True(t, needFlatten(db)) | ||
|
|
||
| runGC(db) | ||
| lastFlattenTs, err := getLastFlattenTs(db) | ||
| require.NoError(t, err) | ||
| require.NotEqual(t, lastTs, lastFlattenTs) | ||
| require.Less(t, time.Now().Unix()-lastFlattenTs, int64(10)) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| package document | ||
|
|
||
| import ( | ||
| "runtime" | ||
| "strconv" | ||
| "time" | ||
|
|
||
| "github.com/dgraph-io/badger/v3" | ||
| "github.com/pingcap/log" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| var ( | ||
| lastFlattenTsKey = []byte("last_flatten_ts") | ||
| flattenInterval = time.Hour * 24 | ||
| ) | ||
|
|
||
| func doGCLoop(db *badger.DB, closed chan struct{}) { | ||
| log.Info("badger start to run value log gc loop") | ||
| ticker := time.NewTicker(10 * time.Minute) | ||
| defer func() { | ||
| ticker.Stop() | ||
| log.Info("badger stop running value log gc loop") | ||
| }() | ||
|
|
||
| // run gc when started. | ||
| runGC(db) | ||
| for { | ||
| select { | ||
| case <-ticker.C: | ||
| runGC(db) | ||
| case <-closed: | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func runGC(db *badger.DB) { | ||
| defer func() { | ||
| r := recover() | ||
| if r != nil { | ||
| log.Error("panic when run badger gc", | ||
| zap.Reflect("r", r), | ||
| zap.Stack("stack trace")) | ||
| } | ||
| }() | ||
|
|
||
| tryFlattenIfNeeded(db) | ||
| runValueLogGC(db) | ||
| } | ||
|
|
||
| func runValueLogGC(db *badger.DB) { | ||
| // at most do 10 value log gc each time. | ||
| for i := 0; i < 10; i++ { | ||
| err := db.RunValueLogGC(0.1) | ||
| if err != nil { | ||
| if err == badger.ErrNoRewrite { | ||
| log.Info("badger has no value log need gc now") | ||
| } else { | ||
| log.Error("badger run value log gc failed", zap.Error(err)) | ||
| } | ||
| return | ||
| } | ||
| log.Info("badger run value log gc success") | ||
| } | ||
| } | ||
|
|
||
| // tryFlattenIfNeeded try to do flatten if needed. | ||
| // Flatten uses to remove the old version keys, otherwise, the value log gc won't release the disk space which occupied | ||
| // by the old version keys. | ||
| func tryFlattenIfNeeded(db *badger.DB) { | ||
| if !needFlatten(db) { | ||
| return | ||
| } | ||
| err := db.Flatten(runtime.NumCPU()/2 + 1) | ||
| if err != nil { | ||
| log.Error("badger flatten failed", zap.Error(err)) | ||
| return | ||
| } | ||
| ts := time.Now().Unix() | ||
| err = storeLastFlattenTs(db, ts) | ||
| if err != nil { | ||
| log.Error("badger store last flatten ts failed", zap.Error(err)) | ||
| return | ||
| } | ||
| log.Info("badger flatten success", zap.Int64("ts", ts)) | ||
| } | ||
|
|
||
| func needFlatten(db *badger.DB) bool { | ||
| ts, err := getLastFlattenTs(db) | ||
| if err != nil { | ||
| log.Error("badger get last flatten ts failed", zap.Error(err)) | ||
| } | ||
| interval := time.Now().Unix() - ts | ||
| return time.Duration(interval)*time.Second >= flattenInterval | ||
| } | ||
|
|
||
| func getLastFlattenTs(db *badger.DB) (int64, error) { | ||
| ts := int64(0) | ||
| err := db.View(func(txn *badger.Txn) error { | ||
| item, err := txn.Get(lastFlattenTsKey) | ||
| if err != nil { | ||
| if err == badger.ErrKeyNotFound { | ||
| return nil | ||
| } | ||
| return err | ||
| } | ||
| err = item.Value(func(val []byte) error { | ||
| ts, err = strconv.ParseInt(string(val), 10, 64) | ||
| return err | ||
| }) | ||
| return err | ||
| }) | ||
| return ts, err | ||
| } | ||
|
|
||
| func storeLastFlattenTs(db *badger.DB, ts int64) error { | ||
| return db.Update(func(txn *badger.Txn) error { | ||
| v := strconv.FormatInt(ts, 10) | ||
| return txn.Set(lastFlattenTsKey, []byte(v)) | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,4 @@ | ||
| //go:build !linux | ||
| // +build !linux | ||
|
|
||
| package timeseries | ||
|
|
||
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