Add innodb_read_rows as vttablet metric

go/vt/vttablet/tabletserver/query_engine_test.go

@@ -32,10 +32,11 @@ import (
 	"testing"
 	"time"
 
+	"vitess.io/vitess/go/mysql"
+
 	"github.com/stretchr/testify/require"
 
 	"vitess.io/vitess/go/cache"
-	"vitess.io/vitess/go/mysql"
 	"vitess.io/vitess/go/mysql/fakesqldb"
 	"vitess.io/vitess/go/sqltypes"
 	"vitess.io/vitess/go/streamlog"
@@ -114,12 +115,7 @@ func TestGetPlanPanicDuetoEmptyQuery(t *testing.T) {
 	}
 }
 
-func TestGetMessageStreamPlan(t *testing.T) {
-	db := fakesqldb.New(t)
-	defer db.Close()
-	for query, result := range schematest.Queries() {
-		db.AddQuery(query, result)
-	}
+func addSchemaEngineQueries(db *fakesqldb.DB) {
 	db.AddQueryPattern(baseShowTablesPattern, &sqltypes.Result{
 		Fields: mysql.BaseShowTablesFields,
 		Rows: [][]sqltypes.Value{
@@ -129,6 +125,22 @@ func TestGetMessageStreamPlan(t *testing.T) {
 			mysql.BaseShowTablesRow("seq", false, "vitess_sequence"),
 			mysql.BaseShowTablesRow("msg", false, "vitess_message,vt_ack_wait=30,vt_purge_after=120,vt_batch_size=1,vt_cache_size=10,vt_poller_interval=30"),
 		}})
+	db.AddQuery("show status like 'Innodb_rows_read'", sqltypes.MakeTestResult(sqltypes.MakeTestFields(
+		"Variable_name|Value",
+		"varchar|int64"),
+		"Innodb_rows_read|0",
+	))
+}
+
+func TestGetMessageStreamPlan(t *testing.T) {
+	db := fakesqldb.New(t)
+	defer db.Close()
+	for query, result := range schematest.Queries() {
+		db.AddQuery(query, result)
+	}
+
+	addSchemaEngineQueries(db)
+
 	qe := newTestQueryEngine(10*time.Second, true, newDBConfigs(db))
 	qe.se.Open()
 	qe.Open()

go/vt/vttablet/tabletserver/query_executor_test.go

@@ -1175,6 +1175,11 @@ func initQueryExecutorTestDB(db *fakesqldb.DB) {
 			mysql.BaseShowTablesRow("msg", false, "vitess_message,vt_ack_wait=30,vt_purge_after=120,vt_batch_size=1,vt_cache_size=10,vt_poller_interval=30"),
 		},
 	})
+	db.AddQuery("show status like 'Innodb_rows_read'", sqltypes.MakeTestResult(sqltypes.MakeTestFields(
+		"Variable_name|Value",
+		"varchar|int64"),
+		"Innodb_rows_read|0",
+	))
 }
 
 func getTestTableFields() []*querypb.Field {

go/vt/vttablet/tabletserver/schema/engine.go

@@ -80,6 +80,7 @@ type Engine struct {
 
 	tableFileSizeGauge      *stats.GaugesWithSingleLabel
 	tableAllocatedSizeGauge *stats.GaugesWithSingleLabel
+	innoDbReadRowsGauge     *stats.Gauge
 }
 
 // NewEngine creates a new Engine.
@@ -99,6 +100,7 @@ func NewEngine(env tabletenv.Env) *Engine {
 	_ = env.Exporter().NewGaugeDurationFunc("SchemaReloadTime", "vttablet keeps table schemas in its own memory and periodically refreshes it from MySQL. This config controls the reload time.", se.ticks.Interval)
 	se.tableFileSizeGauge = env.Exporter().NewGaugesWithSingleLabel("TableFileSize", "tracks table file size", "Table")
 	se.tableAllocatedSizeGauge = env.Exporter().NewGaugesWithSingleLabel("TableAllocatedSize", "tracks table allocated size", "Table")
+	se.innoDbReadRowsGauge = env.Exporter().NewGauge("InnodbRowsRead", "number of rows read by mysql")
 
 	env.Exporter().HandleFunc("/debug/schema", se.handleDebugSchema)
 	env.Exporter().HandleFunc("/schemaz", func(w http.ResponseWriter, r *http.Request) {
@@ -290,9 +292,7 @@ func (se *Engine) ReloadAt(ctx context.Context, pos mysql.Position) error {
 
 // reload reloads the schema. It can also be used to initialize it.
 func (se *Engine) reload(ctx context.Context) error {
-	//start := time.Now()
 	defer func() {
-		//log.Infof("Time taken to load the schema: %v", time.Since(start))
 		se.env.LogError()
 	}()
 
@@ -316,6 +316,11 @@ func (se *Engine) reload(ctx context.Context) error {
 		return err
 	}
 
+	err = se.updateInnoDBRowsRead(ctx, conn)
+	if err != nil {
+		return err
+	}
+
 	rec := concurrency.AllErrorRecorder{}
 	// curTables keeps track of tables in the new snapshot so we can detect what was dropped.
 	curTables := map[string]bool{"dual": true}
@@ -388,6 +393,25 @@ func (se *Engine) reload(ctx context.Context) error {
 	return nil
 }
 
+func (se *Engine) updateInnoDBRowsRead(ctx context.Context, conn *connpool.DBConn) error {
+	readRowsData, err := conn.Exec(ctx, "show status like 'Innodb_rows_read'", 10, false)
+	if err != nil {
+		return err
+	}
+
+	if len(readRowsData.Rows) == 1 && len(readRowsData.Rows[0]) == 2 {
+		value, err := evalengine.ToInt64(readRowsData.Rows[0][1])
+		if err != nil {
+			return err
+		}
+
+		se.innoDbReadRowsGauge.Set(value)
+	} else {
+		log.Warningf("got strange results from 'show status': %v", readRowsData.Rows)
+	}
+	return nil
+}
+
 func (se *Engine) mysqlTime(ctx context.Context, conn *connpool.DBConn) (int64, error) {
 	// Keep `SELECT UNIX_TIMESTAMP` is in uppercase because binlog server queries are case sensitive and expect it to be so.
 	tm, err := conn.Exec(ctx, "SELECT UNIX_TIMESTAMP()", 1, false)

go/vt/vttablet/tabletserver/schema/engine_test.go

@@ -18,6 +18,7 @@ package schema
 
 import (
 	"expvar"
+	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"sort"
@@ -80,6 +81,8 @@ func TestOpenAndReload(t *testing.T) {
 		"int64"),
 		"1427325876",
 	))
+	firstReadRowsValue := 12
+	AddFakeInnoDBReadRowsResult(db, firstReadRowsValue)
 	se := newEngine(10, 10*time.Second, 10*time.Second, db)
 	se.Open()
 	defer se.Close()
@@ -93,6 +96,7 @@ func TestOpenAndReload(t *testing.T) {
 		"int64"),
 		"1427325877",
 	))
+	assert.EqualValues(t, firstReadRowsValue, se.innoDbReadRowsGauge.Get())
 	// Modify test_table_03
 	// Add test_table_04
 	// Drop msg
@@ -144,6 +148,8 @@ func TestOpenAndReload(t *testing.T) {
 			mysql.ShowPrimaryRow("seq", "id"),
 		},
 	})
+	secondReadRowsValue := 123
+	AddFakeInnoDBReadRowsResult(db, secondReadRowsValue)
 
 	firstTime := true
 	notifier := func(full map[string]*Table, created, altered, dropped []string) {
@@ -164,6 +170,8 @@ func TestOpenAndReload(t *testing.T) {
 	err := se.Reload(context.Background())
 	require.NoError(t, err)
 
+	assert.EqualValues(t, secondReadRowsValue, se.innoDbReadRowsGauge.Get())
+
 	want["test_table_03"] = &Table{
 		Name: sqlparser.NewTableIdent("test_table_03"),
 		Fields: []*querypb.Field{{
@@ -338,6 +346,7 @@ func TestOpenFailedDueToTableErr(t *testing.T) {
 			{sqltypes.NewVarBinary("")},
 		},
 	})
+	AddFakeInnoDBReadRowsResult(db, 0)
 	se := newEngine(10, 1*time.Second, 1*time.Second, db)
 	err := se.Open()
 	want := "Row count exceeded"
@@ -492,3 +501,11 @@ func initialSchema() map[string]*Table {
 		},
 	}
 }
+
+func AddFakeInnoDBReadRowsResult(db *fakesqldb.DB, value int) *fakesqldb.ExpectedResult {
+	return db.AddQuery("show status like 'Innodb_rows_read'", sqltypes.MakeTestResult(sqltypes.MakeTestFields(
+		"Variable_name|Value",
+		"varchar|int64"),
+		fmt.Sprintf("Innodb_rows_read|%d", value),
+	))
+}

go/vt/vttablet/tabletserver/schema/main_test.go

@@ -36,6 +36,7 @@ func getTestSchemaEngine(t *testing.T) (*Engine, *fakesqldb.DB, func()) {
 	))
 	db.AddQueryPattern(baseShowTablesPattern, &sqltypes.Result{})
 	db.AddQuery(mysql.BaseShowPrimary, &sqltypes.Result{})
+	AddFakeInnoDBReadRowsResult(db, 1)
 	se := newEngine(10, 10*time.Second, 10*time.Second, db)
 	require.NoError(t, se.Open())
 	cancel := func() {

go/vt/vttablet/tabletserver/tabletserver_test.go

@@ -2465,6 +2465,11 @@ func setupFakeDB(t *testing.T) *fakesqldb.DB {
 			mysql.BaseShowTablesRow("msg", false, "vitess_message,vt_ack_wait=30,vt_purge_after=120,vt_batch_size=1,vt_cache_size=10,vt_poller_interval=30"),
 		},
 	})
+	db.AddQuery("show status like 'Innodb_rows_read'", sqltypes.MakeTestResult(sqltypes.MakeTestFields(
+		"Variable_name|Value",
+		"varchar|int64"),
+		"Innodb_rows_read|0",
+	))
 
 	return db
 }