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main.go
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main.go
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package main
import (
"context"
"database/sql"
"fmt"
"log"
"os"
"os/signal"
"strings"
"time"
"github.com/codahale/hdrhistogram"
"github.com/golang/geo/s2"
_ "github.com/lib/pq"
"github.com/pkg/errors"
)
const (
histMinLatency = 1 * time.Microsecond
histMaxLatency = 100 * time.Second
convertRows = 1000000
queryMinLevel = 8
queryMaxLevel = 20 // ~ 1 meter
querySelectivity = 1
queryShape = cellShape
latenciesMaxCount = (queryMaxLevel - queryMinLevel + 1) * 100
throughputMaxDuration = time.Second
updateInterval = time.Second
earthRadiusMeters = 6371010 // From the c++ s2 library.
)
var cfg = &s2IndexConfig{
minLevel: 0,
maxLevel: 30,
maxCells: 1,
}
type s2IndexConfig struct {
minLevel, maxLevel, maxCells int
rc *s2.RegionCoverer
}
func (c *s2IndexConfig) Covering(r s2.Region) []s2.CellID {
if c, ok := r.(s2.Cell); ok {
return []s2.CellID{c.ID()}
}
if c.rc == nil {
c.rc = &s2.RegionCoverer{MinLevel: c.minLevel, MaxLevel: c.maxLevel, MaxCells: c.maxCells}
}
covering := c.rc.Covering(r)
if c.maxCells == 1 && len(covering) != 1 {
// We covered a cube edge or corner and couldn't do 1 cell.
return nil
}
return covering
}
func convert(in, table, index string, cfg *s2IndexConfig) error {
rr, err := makeRoadReader(in)
if err != nil {
return err
}
defer rr.Close()
tableW, err := os.Create(table)
if err != nil {
return err
}
defer tableW.Close()
indexW, err := os.Create(index)
if err != nil {
return err
}
defer indexW.Close()
start := time.Now()
lastUpdate := start
for i := 0; i < convertRows; {
road, ok := rr.Next()
if !ok {
break
}
if now := time.Now(); now.Sub(lastUpdate) > updateInterval {
lastUpdate = now
fmt.Printf("finished %d queries in %s\n", i, now.Sub(start))
}
name := strings.ReplaceAll(road.name, `,`, ``)
polyline := s2.PolylineFromLatLngs(road.lls)
covering := cfg.Covering(polyline)
if covering == nil {
continue
}
i++
for _, c := range covering {
fmt.Fprintf(indexW, `%d,%s`+"\n", road.idx, c.ToToken())
}
fmt.Fprintf(tableW, `%d,"%s","%s"`+"\n", road.idx, name, road.geometry)
}
if err := tableW.Sync(); err != nil {
return err
}
if err := indexW.Sync(); err != nil {
return err
}
if rr.skipped > 0 {
fmt.Printf("skipped %d\n", rr.skipped)
}
return nil
}
func crdbLoad(conn, table, index string) error {
db, err := sql.Open("postgres", conn)
if err != nil {
return errors.Wrapf(err, "connecting to: %s", conn)
}
if _, err := db.Exec(`DROP TABLE IF EXISTS roads`); err != nil {
return errors.Wrapf(err, "dropping existing data")
}
const importStmt = `IMPORT TABLE roads (id INT PRIMARY KEY, name STRING, geometry STRING) CSV DATA ($1)`
if _, err := db.Exec(importStmt, table); err != nil {
return errors.Wrapf(err, "importing: %s", table)
}
if _, err := db.Exec(`DROP TABLE IF EXISTS roads_s2_idx`); err != nil {
return errors.Wrapf(err, "dropping existing data")
}
start := time.Now()
const importIdxStmt = `IMPORT TABLE roads_s2_idx (id INT, s2 STRING, PRIMARY KEY(s2, id)) CSV DATA ($1)`
if _, err := db.Exec(importIdxStmt, index); err != nil {
return errors.Wrapf(err, "importing: %s", index)
}
fmt.Printf("loaded in %s\n", time.Since(start))
return nil
}
func pgLoad(conn, table, index string) error {
db, err := sql.Open("postgres", conn)
if err != nil {
return errors.Wrapf(err, "connecting to: %s", conn)
}
if _, err := db.Exec(`DROP TABLE IF EXISTS roads`); err != nil {
return errors.Wrapf(err, "dropping existing data")
}
if _, err := db.Exec(`CREATE TABLE roads (id INT PRIMARY KEY, name VARCHAR, geometry GEOMETRY)`); err != nil {
return errors.Wrapf(err, "creating table")
}
start := time.Now()
if _, err := db.Exec(`COPY roads (id, name, geometry) FROM '` + table + `' CSV DELIMITER ','`); err != nil {
return errors.Wrapf(err, "creating table")
}
fmt.Printf("loaded in %s\n", time.Since(start))
start = time.Now()
if _, err := db.Exec(`CREATE INDEX ON roads USING GIST (geometry)`); err != nil {
return errors.Wrapf(err, "creating table")
}
fmt.Printf("created index in %s\n", time.Since(start))
if _, err := db.Exec(`DROP TABLE IF EXISTS roads_s2_idx`); err != nil {
return errors.Wrapf(err, "dropping existing data")
}
if _, err := db.Exec(`CREATE TABLE roads_s2_idx (id INT, s2 VARCHAR, PRIMARY KEY(s2, id))`); err != nil {
return errors.Wrapf(err, "creating table")
}
if _, err := db.Exec(`COPY roads_s2_idx (id, s2) FROM '` + index + `' CSV DELIMITER ','`); err != nil {
return errors.Wrapf(err, "creating table")
}
return nil
}
func ctrlcCtx() (ctx context.Context, cancel func()) {
ctx, cancel = context.WithCancel(context.Background())
signalChan := make(chan os.Signal, 1)
signal.Notify(signalChan, os.Interrupt)
go func() {
select {
case <-signalChan:
fmt.Println("\nReceived an interrupt, stopping...")
signal.Reset(os.Interrupt)
cancel()
case <-ctx.Done():
}
}()
return ctx, cancel
}
func latencies(conn, file string, cfg *s2IndexConfig) error {
ctx, cancel := ctrlcCtx()
defer cancel()
db, err := sql.Open("postgres", conn)
if err != nil {
return errors.Wrapf(err, "connecting to: %s", conn)
}
allQueryOps := []operationType{containsOperation, containingOperation, intersectsOperation}
for i, queryOp := range allQueryOps {
if i != 0 {
fmt.Println()
}
fmt.Printf("starting query type %s shape %s\n", queryOp, queryShape)
const histSigFigs = 1
nanosByLevel := make([]*hdrhistogram.Histogram, queryMaxLevel+1)
for i := range nanosByLevel {
nanosByLevel[i] = hdrhistogram.New(
histMinLatency.Nanoseconds(), histMaxLatency.Nanoseconds(), histSigFigs)
}
countsByLevel := make([]*hdrhistogram.Histogram, queryMaxLevel+1)
for i := range countsByLevel {
countsByLevel[i] = hdrhistogram.New(0, 10000000, histSigFigs)
}
qr, err := makeQueryReader(file, querySelectivity, queryOp)
if err != nil {
return err
}
start := time.Now()
lastUpdate := start
level := -1
for i := 0; i < latenciesMaxCount; level-- {
if err := ctx.Err(); err != nil {
break
}
q, ok := qr.Next()
if !ok {
break
}
if now := time.Now(); now.Sub(lastUpdate) > updateInterval {
lastUpdate = now
fmt.Printf("finished %d queries in %s\n", i, now.Sub(start))
}
if level < queryMinLevel {
level = queryMaxLevel
}
qStart := time.Now()
var count int64
var err error
if cfg != nil {
count, err = q.ReadS2(db, cfg, level)
} else {
count, err = q.ReadPostGIS(db, level)
}
qDuration := time.Since(qStart)
if err == errQuerySkipped {
continue
} else if err != nil {
return err
}
i++
nanosByLevel[level].RecordValue(qDuration.Nanoseconds())
countsByLevel[level].RecordValue(count)
}
fmt.Printf("finished query type %s shape %s\n", queryOp, queryShape)
fmt.Println("level__meters_____numQ_pMin(ms)__p50(ms)__p95(ms)__p99(ms)_pMax(ms)__count50__count95__count99_countMax")
for level := range nanosByLevel {
nanosHist, countsHist := nanosByLevel[level], countsByLevel[level]
if nanosHist.TotalCount() == 0 {
continue
}
fmt.Printf("%5d %7d %8d %8.2f %8.2f %8.2f %8.2f %8.2f %8d %8d %8d %8d\n",
level,
int(metersFromLevel(level)),
nanosHist.TotalCount(),
time.Duration(nanosHist.Min()).Seconds()*1000,
time.Duration(nanosHist.ValueAtQuantile(50)).Seconds()*1000,
time.Duration(nanosHist.ValueAtQuantile(95)).Seconds()*1000,
time.Duration(nanosHist.ValueAtQuantile(99)).Seconds()*1000,
time.Duration(nanosHist.Max()).Seconds()*1000,
countsHist.ValueAtQuantile(50),
countsHist.ValueAtQuantile(95),
countsHist.ValueAtQuantile(99),
countsHist.Max(),
)
}
if err := ctx.Err(); err != nil {
return nil
}
}
return nil
}
func main() {
args := os.Args[1:]
if len(args) < 1 {
log.Fatalf("usage: %s <cmd>", os.Args[0])
}
switch args[0] {
case `convert`:
subArgs := args[1:]
if len(subArgs) != 3 {
log.Fatalf("usage: %s convert <in.csv.bz2> <table.csv> <index.csv>", os.Args[0])
}
if err := convert(subArgs[0], subArgs[1], subArgs[2], cfg); err != nil {
log.Fatal(err)
}
case `crdbload`:
subArgs := args[1:]
if len(subArgs) != 3 {
log.Fatalf("usage: %s crdbload <conn> <table.csv> <index.csv>", os.Args[0])
}
if err := crdbLoad(subArgs[0], subArgs[1], subArgs[2]); err != nil {
log.Fatal(err)
}
case `pgload`:
subArgs := args[1:]
if len(subArgs) != 3 {
log.Fatalf("usage: %s pgload <conn> <table.csv> <index.csv>", os.Args[0])
}
if err := pgLoad(subArgs[0], subArgs[1], subArgs[2]); err != nil {
log.Fatal(err)
}
case `s2latencies`, `pglatencies`:
subArgs := args[1:]
if len(subArgs) != 2 {
log.Fatalf("usage: %s %s <conn> <data.csv.bz2>", os.Args[0], args[0])
}
var s2Cfg *s2IndexConfig
if args[0] == `s2latencies` {
s2Cfg = cfg
}
if err := latencies(subArgs[0], subArgs[1], s2Cfg); err != nil {
log.Fatal(err)
}
default:
log.Fatalf("unknown command: %s", args[0])
}
}