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Adds a tool for converting boltdb->tsdb and benchmarking queries (#5430)
* exports NewChunkIndexIterator * starts building tsdb-bench * adds query benchmark for tsdb prototyping * lint
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "flag" | ||
| "log" | ||
| "strconv" | ||
|
|
||
| "go.etcd.io/bbolt" | ||
| "gopkg.in/yaml.v2" | ||
|
|
||
| "github.com/grafana/loki/pkg/storage/chunk" | ||
| "github.com/grafana/loki/pkg/storage/stores/shipper/compactor/retention" | ||
| shipper_util "github.com/grafana/loki/pkg/storage/stores/shipper/util" | ||
| "github.com/grafana/loki/pkg/storage/tsdb/index" | ||
| ) | ||
|
|
||
| var ( | ||
| source = flag.String("source", "", "the source boltdb file") | ||
| dest = flag.String("dest", "", "the dest tsdb file") | ||
| // Hardcode a periodconfig for convenience as the boltdb iterator needs one | ||
| // NB: must match the index file you're reading from | ||
| periodConfig = func() chunk.PeriodConfig { | ||
| input := ` | ||
| from: "2022-01-01" | ||
| index: | ||
| period: 24h | ||
| prefix: loki_index_ | ||
| object_store: gcs | ||
| schema: v13 | ||
| store: boltdb-shipper | ||
| ` | ||
| var cfg chunk.PeriodConfig | ||
| if err := yaml.Unmarshal([]byte(input), &cfg); err != nil { | ||
| panic(err) | ||
| } | ||
| return cfg | ||
| }() | ||
| ) | ||
|
|
||
| func extractChecksumFromChunkID(b []byte) uint32 { | ||
| i := bytes.LastIndexByte(b, ':') | ||
| x, err := strconv.ParseUint(string(b[i+1:]), 16, 32) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return uint32(x) | ||
| } | ||
|
|
||
| func main() { | ||
| flag.Parse() | ||
|
|
||
| if source == nil || *source == "" { | ||
| panic("source is required") | ||
| } | ||
|
|
||
| if dest == nil || *dest == "" { | ||
| panic("dest is required") | ||
| } | ||
|
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| db, err := shipper_util.SafeOpenBoltdbFile(*source) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
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||
| builder := index.NewBuilder() | ||
|
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| log.Println("Loading index into memory") | ||
|
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| // loads everything into memory. | ||
| if err := db.View(func(t *bbolt.Tx) error { | ||
| it, err := retention.NewChunkIndexIterator(t.Bucket([]byte("index")), periodConfig) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| for it.Next() { | ||
| if it.Err() != nil { | ||
| return it.Err() | ||
| } | ||
| entry := it.Entry() | ||
| builder.AddSeries(entry.Labels, []index.ChunkMeta{{ | ||
| Checksum: extractChecksumFromChunkID(entry.ChunkID), | ||
| MinTime: int64(entry.From), | ||
| MaxTime: int64(entry.Through), | ||
| Bytes: (3 << 20) / 4, // guess: 0.75mb, 1/2 of the max size | ||
| Entries: 10000, // guess: 10k entries | ||
| }}) | ||
| } | ||
|
|
||
| return nil | ||
| }); err != nil { | ||
| panic(err) | ||
| } | ||
|
|
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| log.Println("writing index") | ||
| if err := builder.Build(context.Background(), *dest); err != nil { | ||
| panic(err) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "math/rand" | ||
| "os" | ||
| "testing" | ||
|
|
||
| "github.com/prometheus/prometheus/model/labels" | ||
| "github.com/stretchr/testify/require" | ||
|
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| "github.com/grafana/loki/pkg/storage/tsdb" | ||
| "github.com/grafana/loki/pkg/storage/tsdb/index" | ||
| ) | ||
|
|
||
| func TestExtractChecksum(t *testing.T) { | ||
| x := rand.Uint32() | ||
| s := fmt.Sprintf("a/b/c:d:e:%x", x) | ||
| require.Equal(t, x, extractChecksumFromChunkID([]byte(s))) | ||
| } | ||
|
|
||
| // Requires LOKI_TSDB_PATH to be set or this will short-circuit | ||
| func BenchmarkQuery(b *testing.B) { | ||
| for _, bm := range []struct { | ||
| name string | ||
| matchers []*labels.Matcher | ||
| }{ | ||
| { | ||
| name: "match ns", | ||
| matchers: []*labels.Matcher{labels.MustNewMatcher(labels.MatchEqual, "namespace", "loki-ops")}, | ||
| }, | ||
| { | ||
| name: "match ns regexp", | ||
| matchers: []*labels.Matcher{labels.MustNewMatcher(labels.MatchEqual, "namespace", "loki-ops")}, | ||
| }, | ||
| } { | ||
| indexPath := os.Getenv("LOKI_TSDB_PATH") | ||
| if indexPath == "" { | ||
| return | ||
| } | ||
|
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||
| reader, err := index.NewFileReader(indexPath) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| b.Run(bm.name, func(b *testing.B) { | ||
| for i := 0; i < b.N; i++ { | ||
| p, _ := tsdb.PostingsForMatchers(reader, bm.matchers...) | ||
|
|
||
| for p.Next() { | ||
| } | ||
| } | ||
| }) | ||
| } | ||
| } |