Introducing ExecuteMultiFetchAsDba gRPC and `vtctldclient ExecuteMu…

…ltiFetchAsDBA` command (#15506)

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>

go/cmd/vtctldclient/command/query.go

@@ -46,6 +46,15 @@ var (
 		RunE:                  commandExecuteFetchAsDBA,
 		Aliases:               []string{"ExecuteFetchAsDba"},
 	}
+	// ExecuteMultiFetchAsDBA makes an ExecuteMultiFetchAsDBA gRPC call to a vtctld.
+	ExecuteMultiFetchAsDBA = &cobra.Command{
+		Use:                   "ExecuteMultiFetchAsDBA [--max-rows <max-rows>] [--json|-j] [--disable-binlogs] [--reload-schema] <tablet alias> <sql>",
+		Short:                 "Executes given multiple queries as the DBA user on the remote tablet.",
+		DisableFlagsInUseLine: true,
+		Args:                  cobra.ExactArgs(2),
+		RunE:                  commandExecuteMultiFetchAsDBA,
+		Aliases:               []string{"ExecuteMultiFetchAsDba"},
+	}
 )
 
 var executeFetchAsAppOptions = struct {
@@ -138,6 +147,57 @@ func commandExecuteFetchAsDBA(cmd *cobra.Command, args []string) error {
 	return nil
 }
 
+var executeMultiFetchAsDBAOptions = struct {
+	MaxRows        int64
+	DisableBinlogs bool
+	ReloadSchema   bool
+	JSON           bool
+}{
+	MaxRows: 10_000,
+}
+
+func commandExecuteMultiFetchAsDBA(cmd *cobra.Command, args []string) error {
+	alias, err := topoproto.ParseTabletAlias(cmd.Flags().Arg(0))
+	if err != nil {
+		return err
+	}
+
+	cli.FinishedParsing(cmd)
+
+	sql := cmd.Flags().Arg(1)
+
+	resp, err := client.ExecuteMultiFetchAsDBA(commandCtx, &vtctldatapb.ExecuteMultiFetchAsDBARequest{
+		TabletAlias:    alias,
+		Sql:            sql,
+		MaxRows:        executeMultiFetchAsDBAOptions.MaxRows,
+		DisableBinlogs: executeMultiFetchAsDBAOptions.DisableBinlogs,
+		ReloadSchema:   executeMultiFetchAsDBAOptions.ReloadSchema,
+	})
+	if err != nil {
+		return err
+	}
+
+	var qrs []*sqltypes.Result
+	for _, result := range resp.Results {
+		qr := sqltypes.Proto3ToResult(result)
+		qrs = append(qrs, qr)
+	}
+
+	switch executeMultiFetchAsDBAOptions.JSON {
+	case true:
+		data, err := cli.MarshalJSON(qrs)
+		if err != nil {
+			return err
+		}
+		fmt.Printf("%s\n", data)
+	default:
+		for _, qr := range qrs {
+			cli.WriteQueryResultTable(cmd.OutOrStdout(), qr)
+		}
+	}
+	return nil
+}
+
 func init() {
 	ExecuteFetchAsApp.Flags().Int64Var(&executeFetchAsAppOptions.MaxRows, "max-rows", 10_000, "The maximum number of rows to fetch from the remote tablet.")
 	ExecuteFetchAsApp.Flags().BoolVar(&executeFetchAsAppOptions.UsePool, "use-pool", false, "Use the tablet connection pool instead of creating a fresh connection.")
@@ -149,4 +209,10 @@ func init() {
 	ExecuteFetchAsDBA.Flags().BoolVar(&executeFetchAsDBAOptions.ReloadSchema, "reload-schema", false, "Instructs the tablet to reload its schema after executing the query.")
 	ExecuteFetchAsDBA.Flags().BoolVarP(&executeFetchAsDBAOptions.JSON, "json", "j", false, "Output the results in JSON instead of a human-readable table.")
 	Root.AddCommand(ExecuteFetchAsDBA)
+
+	ExecuteMultiFetchAsDBA.Flags().Int64Var(&executeMultiFetchAsDBAOptions.MaxRows, "max-rows", 10_000, "The maximum number of rows to fetch from the remote tablet.")
+	ExecuteMultiFetchAsDBA.Flags().BoolVar(&executeMultiFetchAsDBAOptions.DisableBinlogs, "disable-binlogs", false, "Disables binary logging during the query.")
+	ExecuteMultiFetchAsDBA.Flags().BoolVar(&executeMultiFetchAsDBAOptions.ReloadSchema, "reload-schema", false, "Instructs the tablet to reload its schema after executing the query.")
+	ExecuteMultiFetchAsDBA.Flags().BoolVarP(&executeMultiFetchAsDBAOptions.JSON, "json", "j", false, "Output the results in JSON instead of a human-readable table.")
+	Root.AddCommand(ExecuteMultiFetchAsDBA)
 }

go/flags/endtoend/vtctldclient.txt

@@ -30,6 +30,7 @@ Available Commands:
   ExecuteFetchAsApp           Executes the given query as the App user on the remote tablet.
   ExecuteFetchAsDBA           Executes the given query as the DBA user on the remote tablet.
   ExecuteHook                 Runs the specified hook on the given tablet.
+  ExecuteMultiFetchAsDBA      Executes given multiple queries as the DBA user on the remote tablet.
   FindAllShardsInKeyspace     Returns a map of shard names to shard references for a given keyspace.
   GenerateShardRanges         Print a set of shard ranges assuming a keyspace with N shards.
   GetBackups                  Lists backups for the given shard.

go/test/endtoend/tabletgateway/vtgate_test.go

@@ -82,13 +82,14 @@ func TestVtgateReplicationStatusCheck(t *testing.T) {
 	// Stop replication on the non-PRIMARY tablets.
 	_, err = clusterInstance.VtctldClientProcess.ExecuteCommandWithOutput("ExecuteFetchAsDBA", clusterInstance.Keyspaces[0].Shards[0].Replica().Alias, "stop slave")
 	require.NoError(t, err)
-	_, err = clusterInstance.VtctldClientProcess.ExecuteCommandWithOutput("ExecuteFetchAsDBA", clusterInstance.Keyspaces[0].Shards[0].Rdonly().Alias, "stop slave")
+	_, err = clusterInstance.VtctldClientProcess.ExecuteCommandWithOutput("ExecuteMultiFetchAsDBA", clusterInstance.Keyspaces[0].Shards[0].Rdonly().Alias, "stop slave")
 	require.NoError(t, err)
 	// Restart replication afterward as the cluster is re-used.
 	defer func() {
 		_, err = clusterInstance.VtctldClientProcess.ExecuteCommandWithOutput("ExecuteFetchAsDBA", clusterInstance.Keyspaces[0].Shards[0].Replica().Alias, "start slave")
 		require.NoError(t, err)
-		_, err = clusterInstance.VtctldClientProcess.ExecuteCommandWithOutput("ExecuteFetchAsDBA", clusterInstance.Keyspaces[0].Shards[0].Rdonly().Alias, "start slave")
+		// Testing ExecuteMultiFetchAsDBA by running multiple commands in a single call:
+		_, err = clusterInstance.VtctldClientProcess.ExecuteCommandWithOutput("ExecuteMultiFetchAsDBA", clusterInstance.Keyspaces[0].Shards[0].Rdonly().Alias, "start slave sql_thread; start slave io_thread;")
 		require.NoError(t, err)
 	}()
 	time.Sleep(2 * time.Second) // Build up some replication lag

go/test/endtoend/tabletmanager/commands_test.go

@@ -60,12 +60,21 @@ func TestTabletCommands(t *testing.T) {
 	utils.Exec(t, conn, "insert into t1(id, value) values(1,'a'), (2,'b')")
 	checkDataOnReplica(t, replicaConn, `[[VARCHAR("a")] [VARCHAR("b")]]`)
 
-	// make sure direct dba queries work
-	sql := "select * from t1"
-	result, err := clusterInstance.VtctldClientProcess.ExecuteCommandWithOutput("ExecuteFetchAsDBA", "--json", primaryTablet.Alias, sql)
-	require.Nil(t, err)
-	assertExecuteFetch(t, result)
+	t.Run("ExecuteFetchAsDBA", func(t *testing.T) {
+		// make sure direct dba queries work
+		sql := "select * from t1"
+		result, err := clusterInstance.VtctldClientProcess.ExecuteCommandWithOutput("ExecuteFetchAsDBA", "--json", primaryTablet.Alias, sql)
+		require.Nil(t, err)
+		assertExecuteFetch(t, result)
+	})
 
+	t.Run("ExecuteMultiFetchAsDBA", func(t *testing.T) {
+		// make sure direct dba queries work
+		sql := "select * from t1; select * from t1 limit 100"
+		result, err := clusterInstance.VtctldClientProcess.ExecuteCommandWithOutput("ExecuteMultiFetchAsDBA", "--json", primaryTablet.Alias, sql)
+		require.Nil(t, err)
+		assertExecuteMultiFetch(t, result)
+	})
 	// check Ping / RefreshState / RefreshStateByShard
 	err = clusterInstance.VtctldClientProcess.ExecuteCommand("PingTablet", primaryTablet.Alias)
 	require.Nil(t, err, "error should be Nil")
@@ -139,6 +148,22 @@ func assertExecuteFetch(t *testing.T, qr string) {
 	want = int(2)
 	assert.Equal(t, want, got)
 }
+func assertExecuteMultiFetch(t *testing.T, qr string) {
+	resultMap := make([]map[string]any, 0)
+	err := json.Unmarshal([]byte(qr), &resultMap)
+	require.Nil(t, err)
+	require.NotEmpty(t, resultMap)
+
+	rows := reflect.ValueOf(resultMap[0]["rows"])
+	got := rows.Len()
+	want := int(2)
+	assert.Equal(t, want, got)
+
+	fields := reflect.ValueOf(resultMap[0]["fields"])
+	got = fields.Len()
+	want = int(2)
+	assert.Equal(t, want, got)
+}
 
 func TestHook(t *testing.T) {
 	// test a regular program works