allow configurable shards/replicas

cmd/rp-indexer/main.go

@@ -62,7 +62,7 @@ func main() {
 		// if rebuilding, just do a complete index and quit. In future when we support multiple indexers,
 		// the rebuild argument can be become the name of the index to rebuild, e.g. --rebuild=contacts
 		idxr := idxrs[0]
-		if _, err := idxr.Index(db, true, cfg.Cleanup); err != nil {
+		if _, err := idxr.Index(db, true, cfg.Cleanup, cfg.ContactsShards, cfg.ContactsReplicas); err != nil {
 			log.WithField("indexer", idxr.Name()).WithError(err).Fatal("error during rebuilding")
 		}
 	} else {

config.go

@@ -3,14 +3,16 @@ package indexer
 import "os"
 
 type Config struct {
-	ElasticURL string `help:"the url for our elastic search instance"`
-	DB         string `help:"the connection string for our database"`
-	Index      string `help:"the alias for our contact index"`
-	Poll       int    `help:"the number of seconds to wait between checking for updated contacts"`
-	Rebuild    bool   `help:"whether to rebuild the index, swapping it when complete, then exiting (default false)"`
-	Cleanup    bool   `help:"whether to remove old indexes after a rebuild"`
-	LogLevel   string `help:"the log level, one of error, warn, info, debug"`
-	SentryDSN  string `help:"the sentry configuration to log errors to, if any"`
+	ElasticURL       string `help:"the url for our elastic search instance"`
+	DB               string `help:"the connection string for our database"`
+	Index            string `help:"the alias for our contact index"`
+	Poll             int    `help:"the number of seconds to wait between checking for updated contacts"`
+	Rebuild          bool   `help:"whether to rebuild the index, swapping it when complete, then exiting (default false)"`
+	Cleanup          bool   `help:"whether to remove old indexes after a rebuild"`
+	LogLevel         string `help:"the log level, one of error, warn, info, debug"`
+	SentryDSN        string `help:"the sentry configuration to log errors to, if any"`
+	ContactsShards   int    `help:"The number of shards to use for the contacts index"`
+	ContactsReplicas int    `help:"The number of replicas to use for the contacts index"`
 
 	LibratoUsername string `help:"the username that will be used to authenticate to Librato"`
 	LibratoToken    string `help:"the token that will be used to authenticate to Librato"`
@@ -21,13 +23,15 @@ func NewDefaultConfig() *Config {
 	hostname, _ := os.Hostname()
 
 	return &Config{
-		ElasticURL:   "http://localhost:9200",
-		DB:           "postgres://localhost/temba?sslmode=disable",
-		Index:        "contacts",
-		Poll:         5,
-		Rebuild:      false,
-		Cleanup:      false,
-		LogLevel:     "info",
-		InstanceName: hostname,
+		ElasticURL:       "http://localhost:9200",
+		DB:               "postgres://localhost/temba?sslmode=disable",
+		Index:            "contacts",
+		Poll:             5,
+		Rebuild:          false,
+		Cleanup:          false,
+		LogLevel:         "info",
+		InstanceName:     hostname,
+		ContactsShards:   2,
+		ContactsReplicas: 1,
 	}
 }

daemon.go

@@ -66,7 +66,7 @@ func (d *Daemon) startIndexer(indexer indexers.Indexer) {
 			case <-d.quit:
 				return
 			case <-time.After(d.poll):
-				_, err := indexer.Index(d.db, d.cfg.Rebuild, d.cfg.Cleanup)
+				_, err := indexer.Index(d.db, d.cfg.Rebuild, d.cfg.Cleanup, d.cfg.ContactsShards, d.cfg.ContactsReplicas)
 				if err != nil {
 					log.WithError(err).Error("error during indexing")
 				}

indexers/base.go

@@ -29,10 +29,22 @@ type Stats struct {
 // Indexer is base interface for indexers
 type Indexer interface {
 	Name() string
-	Index(db *sql.DB, rebuild, cleanup bool) (string, error)
+	Index(db *sql.DB, rebuild, cleanup bool, shards int, replicas int) (string, error)
 	Stats() Stats
 }
 
+type ElasticSettings struct {
+	Settings struct {
+		Index struct {
+			NumberOfShards       int `json:"number_of_shards"`
+			NumberOfReplicas     int `json:"number_of_replicas"`
+			RoutingPartitionSize int `json:"routing_partition_size"`
+		} `json:"index"`
+		Analysis json.RawMessage `json:"analysis"`
+	} `json:"settings"`
+	Mappings json.RawMessage `json:"mappings"`
+}
+
 type baseIndexer struct {
 	elasticURL string
 	name       string // e.g. contacts, used as the alias
@@ -99,7 +111,7 @@ func (i *baseIndexer) FindIndexes() []string {
 // that index to `contacts`.
 //
 // If the day-specific name already exists, we append a .1 or .2 to the name.
-func (i *baseIndexer) createNewIndex(settings json.RawMessage) (string, error) {
+func (i *baseIndexer) createNewIndex(indexSettings ElasticSettings) (string, error) {
 	// create our day-specific name
 	index := fmt.Sprintf("%s_%s", i.name, time.Now().Format("2006_01_02"))
 	idx := 0
@@ -121,7 +133,11 @@ func (i *baseIndexer) createNewIndex(settings json.RawMessage) (string, error) {
 	}
 
 	// create the new index
-	_, err := utils.MakeJSONRequest(http.MethodPut, fmt.Sprintf("%s/%s?include_type_name=true", i.elasticURL, index), settings, nil)
+	settings, err := json.Marshal(indexSettings)
+	if err != nil {
+		return "", err
+	}
+	_, err = utils.MakeJSONRequest(http.MethodPut, fmt.Sprintf("%s/%s?include_type_name=true", i.elasticURL, index), settings, nil)
 	if err != nil {
 		return "", err
 	}

indexers/contacts.go

@@ -6,14 +6,13 @@ import (
 	_ "embed"
 	"encoding/json"
 	"fmt"
-	"time"
-
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
+	"io/ioutil"
+	"time"
 )
 
-//go:embed contacts.settings.json
-var contactsSettings json.RawMessage
+var contactsSettings ElasticSettings
 
 // ContactIndexer is an indexer for contacts
 type ContactIndexer struct {
@@ -31,7 +30,7 @@ func NewContactIndexer(elasticURL, name string, batchSize int) *ContactIndexer {
 }
 
 // Index indexes modified contacts and returns the name of the concrete index
-func (i *ContactIndexer) Index(db *sql.DB, rebuild, cleanup bool) (string, error) {
+func (i *ContactIndexer) Index(db *sql.DB, rebuild, cleanup bool, shards int, replicas int) (string, error) {
 	var err error
 
 	// find our physical index
@@ -47,6 +46,10 @@ func (i *ContactIndexer) Index(db *sql.DB, rebuild, cleanup bool) (string, error
 
 	// doesn't exist or we are rebuilding, create it
 	if physicalIndex == "" || rebuild {
+		file, _ := ioutil.ReadFile("contacts.settings.json")
+		_ = json.Unmarshal([]byte(file), &contactsSettings)
+		contactsSettings.Settings.Index.NumberOfShards = shards
+		contactsSettings.Settings.Index.NumberOfReplicas = replicas
 		physicalIndex, err = i.createNewIndex(contactsSettings)
 		if err != nil {
 			return "", errors.Wrap(err, "error creating new index")