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ethdb/leveldb: update leveldb metrics collection (#27643)
This removes text parsing in leveldb metrics collection code. All metrics can now be accessed through the stats API provided by leveldb. We also add new gauge-typed metrics that count the number of tables at each level. --------- Co-authored-by: Exca-DK <Exca-DK@users.noreply.github.com> Co-authored-by: Gary Rong <garyrong0905@gmail.com> Co-authored-by: Felix Lange <fjl@twurst.com>
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@ -22,8 +22,6 @@ package leveldb
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import (
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"fmt"
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"strconv"
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"strings"
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"sync"
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"time"
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@ -77,6 +75,8 @@ type Database struct {
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seekCompGauge metrics.Gauge // Gauge for tracking the number of table compaction caused by read opt
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manualMemAllocGauge metrics.Gauge // Gauge to track the amount of memory that has been manually allocated (not a part of runtime/GC)
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levelsGauge [7]metrics.Gauge // Gauge for tracking the number of tables in levels
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quitLock sync.Mutex // Mutex protecting the quit channel access
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quitChan chan chan error // Quit channel to stop the metrics collection before closing the database
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@ -146,6 +146,11 @@ func NewCustom(file string, namespace string, customize func(options *opt.Option
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ldb.seekCompGauge = metrics.NewRegisteredGauge(namespace+"compact/seek", nil)
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ldb.manualMemAllocGauge = metrics.NewRegisteredGauge(namespace+"memory/manualalloc", nil)
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// leveldb has only up to 7 levels
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for i := range ldb.levelsGauge {
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ldb.levelsGauge[i] = metrics.NewRegisteredGauge(namespace+fmt.Sprintf("tables/level%v", i), nil)
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}
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// Start up the metrics gathering and return
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go ldb.meter(metricsGatheringInterval)
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return ldb, nil
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@ -266,122 +271,63 @@ func (db *Database) Path() string {
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// meter periodically retrieves internal leveldb counters and reports them to
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// the metrics subsystem.
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//
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// This is how a LevelDB stats table looks like (currently):
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//
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// Compactions
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// Level | Tables | Size(MB) | Time(sec) | Read(MB) | Write(MB)
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// -------+------------+---------------+---------------+---------------+---------------
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// 0 | 0 | 0.00000 | 1.27969 | 0.00000 | 12.31098
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// 1 | 85 | 109.27913 | 28.09293 | 213.92493 | 214.26294
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// 2 | 523 | 1000.37159 | 7.26059 | 66.86342 | 66.77884
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// 3 | 570 | 1113.18458 | 0.00000 | 0.00000 | 0.00000
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//
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// This is how the write delay look like (currently):
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// DelayN:5 Delay:406.604657ms Paused: false
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//
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// This is how the iostats look like (currently):
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// Read(MB):3895.04860 Write(MB):3654.64712
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func (db *Database) meter(refresh time.Duration) {
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// Create the counters to store current and previous compaction values
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compactions := make([][]float64, 2)
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compactions := make([][]int64, 2)
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for i := 0; i < 2; i++ {
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compactions[i] = make([]float64, 4)
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compactions[i] = make([]int64, 4)
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}
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// Create storage for iostats.
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var iostats [2]float64
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// Create storage and warning log tracer for write delay.
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var (
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delaystats [2]int64
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lastWritePaused time.Time
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)
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// Create storages for states and warning log tracer.
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var (
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errc chan error
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merr error
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)
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stats leveldb.DBStats
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iostats [2]int64
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delaystats [2]int64
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lastWritePaused time.Time
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)
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timer := time.NewTimer(refresh)
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defer timer.Stop()
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// Iterate ad infinitum and collect the stats
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for i := 1; errc == nil && merr == nil; i++ {
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// Retrieve the database stats
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stats, err := db.db.GetProperty("leveldb.stats")
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// Stats method resets buffers inside therefore it's okay to just pass the struct.
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err := db.db.Stats(&stats)
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if err != nil {
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db.log.Error("Failed to read database stats", "err", err)
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merr = err
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continue
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}
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// Find the compaction table, skip the header
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lines := strings.Split(stats, "\n")
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for len(lines) > 0 && strings.TrimSpace(lines[0]) != "Compactions" {
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lines = lines[1:]
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}
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if len(lines) <= 3 {
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db.log.Error("Compaction leveldbTable not found")
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merr = errors.New("compaction leveldbTable not found")
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continue
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}
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lines = lines[3:]
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// Iterate over all the leveldbTable rows, and accumulate the entries
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for j := 0; j < len(compactions[i%2]); j++ {
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compactions[i%2][j] = 0
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}
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for _, line := range lines {
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parts := strings.Split(line, "|")
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if len(parts) != 6 {
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break
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}
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for idx, counter := range parts[2:] {
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value, err := strconv.ParseFloat(strings.TrimSpace(counter), 64)
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if err != nil {
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db.log.Error("Compaction entry parsing failed", "err", err)
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merr = err
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continue
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}
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compactions[i%2][idx] += value
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}
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compactions[i%2][0] = stats.LevelSizes.Sum()
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for _, t := range stats.LevelDurations {
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compactions[i%2][1] += t.Nanoseconds()
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}
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compactions[i%2][2] = stats.LevelRead.Sum()
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compactions[i%2][3] = stats.LevelWrite.Sum()
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// Update all the requested meters
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if db.diskSizeGauge != nil {
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db.diskSizeGauge.Update(int64(compactions[i%2][0] * 1024 * 1024))
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db.diskSizeGauge.Update(compactions[i%2][0])
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}
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if db.compTimeMeter != nil {
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db.compTimeMeter.Mark(int64((compactions[i%2][1] - compactions[(i-1)%2][1]) * 1000 * 1000 * 1000))
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db.compTimeMeter.Mark(compactions[i%2][1] - compactions[(i-1)%2][1])
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}
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if db.compReadMeter != nil {
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db.compReadMeter.Mark(int64((compactions[i%2][2] - compactions[(i-1)%2][2]) * 1024 * 1024))
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db.compReadMeter.Mark(compactions[i%2][2] - compactions[(i-1)%2][2])
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}
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if db.compWriteMeter != nil {
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db.compWriteMeter.Mark(int64((compactions[i%2][3] - compactions[(i-1)%2][3]) * 1024 * 1024))
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}
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// Retrieve the write delay statistic
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writedelay, err := db.db.GetProperty("leveldb.writedelay")
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if err != nil {
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db.log.Error("Failed to read database write delay statistic", "err", err)
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merr = err
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continue
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db.compWriteMeter.Mark(compactions[i%2][3] - compactions[(i-1)%2][3])
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}
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var (
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delayN int64
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delayDuration string
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duration time.Duration
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paused bool
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delayN = int64(stats.WriteDelayCount)
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duration = stats.WriteDelayDuration
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paused = stats.WritePaused
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)
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if n, err := fmt.Sscanf(writedelay, "DelayN:%d Delay:%s Paused:%t", &delayN, &delayDuration, &paused); n != 3 || err != nil {
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db.log.Error("Write delay statistic not found")
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merr = err
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continue
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}
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duration, err = time.ParseDuration(delayDuration)
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if err != nil {
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db.log.Error("Failed to parse delay duration", "err", err)
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merr = err
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continue
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}
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if db.writeDelayNMeter != nil {
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db.writeDelayNMeter.Mark(delayN - delaystats[0])
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}
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@ -397,60 +343,27 @@ func (db *Database) meter(refresh time.Duration) {
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}
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delaystats[0], delaystats[1] = delayN, duration.Nanoseconds()
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// Retrieve the database iostats.
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ioStats, err := db.db.GetProperty("leveldb.iostats")
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if err != nil {
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db.log.Error("Failed to read database iostats", "err", err)
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merr = err
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continue
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}
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var nRead, nWrite float64
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parts := strings.Split(ioStats, " ")
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if len(parts) < 2 {
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db.log.Error("Bad syntax of ioStats", "ioStats", ioStats)
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merr = fmt.Errorf("bad syntax of ioStats %s", ioStats)
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continue
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}
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if n, err := fmt.Sscanf(parts[0], "Read(MB):%f", &nRead); n != 1 || err != nil {
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db.log.Error("Bad syntax of read entry", "entry", parts[0])
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merr = err
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continue
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}
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if n, err := fmt.Sscanf(parts[1], "Write(MB):%f", &nWrite); n != 1 || err != nil {
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db.log.Error("Bad syntax of write entry", "entry", parts[1])
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merr = err
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continue
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}
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var (
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nRead = int64(stats.IORead)
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nWrite = int64(stats.IOWrite)
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)
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if db.diskReadMeter != nil {
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db.diskReadMeter.Mark(int64((nRead - iostats[0]) * 1024 * 1024))
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db.diskReadMeter.Mark(nRead - iostats[0])
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}
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if db.diskWriteMeter != nil {
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db.diskWriteMeter.Mark(int64((nWrite - iostats[1]) * 1024 * 1024))
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db.diskWriteMeter.Mark(nWrite - iostats[1])
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}
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iostats[0], iostats[1] = nRead, nWrite
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compCount, err := db.db.GetProperty("leveldb.compcount")
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if err != nil {
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db.log.Error("Failed to read database iostats", "err", err)
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merr = err
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continue
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}
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db.memCompGauge.Update(int64(stats.MemComp))
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db.level0CompGauge.Update(int64(stats.Level0Comp))
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db.nonlevel0CompGauge.Update(int64(stats.NonLevel0Comp))
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db.seekCompGauge.Update(int64(stats.SeekComp))
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var (
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memComp uint32
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level0Comp uint32
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nonLevel0Comp uint32
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seekComp uint32
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)
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if n, err := fmt.Sscanf(compCount, "MemComp:%d Level0Comp:%d NonLevel0Comp:%d SeekComp:%d", &memComp, &level0Comp, &nonLevel0Comp, &seekComp); n != 4 || err != nil {
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db.log.Error("Compaction count statistic not found")
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merr = err
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continue
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// update tables amount
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for i, tables := range stats.LevelTablesCounts {
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db.levelsGauge[i].Update(int64(tables))
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}
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db.memCompGauge.Update(int64(memComp))
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db.level0CompGauge.Update(int64(level0Comp))
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db.nonlevel0CompGauge.Update(int64(nonLevel0Comp))
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db.seekCompGauge.Update(int64(seekComp))
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// Sleep a bit, then repeat the stats collection
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select {
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