*: support MockAutoScaler and AWSAutoScaler

config/BUILD.bazel

@@ -13,6 +13,7 @@ go_library(
         "//br/pkg/streamhelper/config",
         "//parser/terror",
         "//util/logutil",
+        "//util/tiflashcompute",
         "//util/tikvutil",
         "//util/versioninfo",
         "@com_github_burntsushi_toml//:toml",

config/config.go

@@ -35,6 +35,7 @@ import (
 	logbackupconf "github.com/pingcap/tidb/br/pkg/streamhelper/config"
 	"github.com/pingcap/tidb/parser/terror"
 	"github.com/pingcap/tidb/util/logutil"
+	"github.com/pingcap/tidb/util/tiflashcompute"
 	"github.com/pingcap/tidb/util/tikvutil"
 	"github.com/pingcap/tidb/util/versioninfo"
 	tikvcfg "github.com/tikv/client-go/v2/config"
@@ -287,7 +288,14 @@ type Config struct {
 	Plugin                     Plugin     `toml:"plugin" json:"plugin"`
 	MaxServerConnections       uint32     `toml:"max-server-connections" json:"max-server-connections"`
 	RunDDL                     bool       `toml:"run-ddl" json:"run-ddl"`
-	DisaggregatedTiFlash       bool       `toml:"disaggregated-tiflash" json:"disaggregated-tiflash"`
+
+	// These configs are related to disaggregated-tiflash mode.
+	DisaggregatedTiFlash         bool   `toml:"disaggregated-tiflash" json:"disaggregated-tiflash"`
+	TiFlashComputeAutoScalerType string `toml:"autoscaler-type" json:"autoscaler-type"`
+	TiFlashComputeAutoScalerAddr string `toml:"autoscaler-addr" json:"autoscaler-addr"`
+	IsTiFlashComputeFixedPool    bool   `toml:"is-tiflashcompute-fixed-pool" json:"is-tiflashcompute-fixed-pool"`
+	AutoScalerClusterID          string `toml:"autoscaler-cluster-id" json:"autoscaler-cluster-id"`
+
 	// TiDBMaxReuseChunk indicates max cached chunk num
 	TiDBMaxReuseChunk uint32 `toml:"tidb-max-reuse-chunk" json:"tidb-max-reuse-chunk"`
 	// TiDBMaxReuseColumn indicates max cached column num
@@ -1000,6 +1008,10 @@ var defaultConf = Config{
 	EnableGlobalKill:                     true,
 	TrxSummary:                           DefaultTrxSummary(),
 	DisaggregatedTiFlash:                 false,
+	TiFlashComputeAutoScalerType:         tiflashcompute.DefASStr,
+	TiFlashComputeAutoScalerAddr:         tiflashcompute.DefAWSAutoScalerAddr,
+	IsTiFlashComputeFixedPool:            false,
+	AutoScalerClusterID:                  "",
 	TiDBMaxReuseChunk:                    64,
 	TiDBMaxReuseColumn:                   256,
 	TiDBEnableExitCheck:                  false,
@@ -1031,6 +1043,26 @@ func StoreGlobalConfig(config *Config) {
 	tikvcfg.StoreGlobalConfig(&cfg)
 }
 
+// GetAutoScalerClusterID returns KeyspaceName or AutoScalerClusterID.
+func GetAutoScalerClusterID() (string, error) {
+	c := GetGlobalConfig()
+	keyspaceName := c.KeyspaceName
+	clusterID := c.AutoScalerClusterID
+
+	if keyspaceName != "" && clusterID != "" {
+		return "", errors.Errorf("config.KeyspaceName(%s) and config.AutoScalerClusterID(%s) are not empty both", keyspaceName, clusterID)
+	}
+	if keyspaceName == "" && clusterID == "" {
+		return "", errors.Errorf("config.KeyspaceName and config.AutoScalerClusterID are both empty")
+	}
+
+	res := keyspaceName
+	if res == "" {
+		res = clusterID
+	}
+	return res, nil
+}
+
 // removedConfig contains items that are no longer supported.
 // they might still be in the config struct to support import,
 // but are not actively used.
@@ -1315,6 +1347,17 @@ func (c *Config) Valid() error {
 		return fmt.Errorf("stats-load-queue-size should be [%d, %d]", DefStatsLoadQueueSizeLimit, DefMaxOfStatsLoadQueueSizeLimit)
 	}
 
+	// Check tiflash_compute topo fetch is valid.
+	if c.DisaggregatedTiFlash {
+		if !tiflashcompute.IsValidAutoScalerConfig(c.TiFlashComputeAutoScalerType) {
+			return fmt.Errorf("invalid AutoScaler type, expect %s, %s or %s, got %s",
+				tiflashcompute.MockASStr, tiflashcompute.AWSASStr, tiflashcompute.GCPASStr, c.TiFlashComputeAutoScalerType)
+		}
+		if c.TiFlashComputeAutoScalerAddr == "" {
+			return fmt.Errorf("autoscaler-addr cannot be empty when disaggregated-tiflash mode is true")
+		}
+	}
+
 	// test log level
 	l := zap.NewAtomicLevel()
 	return l.UnmarshalText([]byte(c.Log.Level))

config/config.toml.example

@@ -114,6 +114,21 @@ enable-enum-length-limit = true
 # command can be forwarded to the right TiDB instance to execute.
 enable-global-kill = true
 
+# disaggregated-tiflash indicates whether TiDB is in disaggregated tiflash mode, if true, MPP will runs on tiflash_compute nodes.
+disaggregated-tiflash = false
+
+# autoscaler-type indicates which type of AutoScaler will be used. Possible values are: mock, aws, gcp.
+# Only meaningful when disaggregated-tiflash is true.
+autoscaler-type = "aws"
+
+# autoscaler-addr is the host of AutoScaler, Only meaningful when disaggregated-tiflash is true.
+# Only meaningful when disaggregated-tiflash is true.
+autoscaler-addr = "tiflash-autoscale-lb.tiflash-autoscale.svc.cluster.local:8081"
+
+# autoscaler-cluster-id is the unique id for each TiDB cluster, which will used by AutoScaler.
+# Only meaningful when disaggregated-tiflash is true.
+autoscaler-cluster-id = ""
+
 [log]
 # Log level: debug, info, warn, error, fatal.
 level = "info"

executor/tiflashtest/BUILD.bazel

@@ -22,6 +22,7 @@ go_test(
         "//testkit",
         "//testkit/external",
         "//util/israce",
+        "//util/tiflashcompute",
         "@com_github_pingcap_errors//:errors",
         "@com_github_pingcap_failpoint//:failpoint",
         "@com_github_pingcap_kvproto//pkg/metapb",

executor/tiflashtest/tiflash_test.go

@@ -37,6 +37,7 @@ import (
 	"github.com/pingcap/tidb/testkit"
 	"github.com/pingcap/tidb/testkit/external"
 	"github.com/pingcap/tidb/util/israce"
+	"github.com/pingcap/tidb/util/tiflashcompute"
 	"github.com/stretchr/testify/require"
 	"github.com/tikv/client-go/v2/testutils"
 )
@@ -1258,24 +1259,32 @@ func TestDisaggregatedTiFlash(t *testing.T) {
 	config.UpdateGlobal(func(conf *config.Config) {
 		conf.DisaggregatedTiFlash = true
 	})
+	defer config.UpdateGlobal(func(conf *config.Config) {
+		conf.DisaggregatedTiFlash = false
+	})
+	err := tiflashcompute.InitGlobalTopoFetcher(tiflashcompute.TestASStr, "", "", false)
+	require.NoError(t, err)
+
 	store := testkit.CreateMockStore(t, withMockTiFlash(2))
 	tk := testkit.NewTestKit(t, store)
 	tk.MustExec("use test")
 	tk.MustExec("drop table if exists t")
 	tk.MustExec("create table t(c1 int)")
 	tk.MustExec("alter table t set tiflash replica 1")
 	tb := external.GetTableByName(t, tk, "test", "t")
-	err := domain.GetDomain(tk.Session()).DDL().UpdateTableReplicaInfo(tk.Session(), tb.Meta().ID, true)
+	err = domain.GetDomain(tk.Session()).DDL().UpdateTableReplicaInfo(tk.Session(), tb.Meta().ID, true)
 	require.NoError(t, err)
 	tk.MustExec("set @@session.tidb_isolation_read_engines=\"tiflash\"")
 
 	err = tk.ExecToErr("select * from t;")
-	require.Contains(t, err.Error(), "tiflash_compute node is unavailable")
+	// Expect error, because TestAutoScaler return empty topo.
+	require.Contains(t, err.Error(), "Cannot find proper topo from AutoScaler")
 
-	config.UpdateGlobal(func(conf *config.Config) {
-		conf.DisaggregatedTiFlash = false
-	})
-	tk.MustQuery("select * from t;").Check(testkit.Rows())
+	err = tiflashcompute.InitGlobalTopoFetcher(tiflashcompute.AWSASStr, "", "", false)
+	require.NoError(t, err)
+	err = tk.ExecToErr("select * from t;")
+	// Expect error, because AWSAutoScaler is not setup, so http request will fail.
+	require.Contains(t, err.Error(), "[util:1815]Internal : get tiflash_compute topology failed")
 }
 
 func TestDisaggregatedTiFlashQuery(t *testing.T) {

planner/core/fragment.go

@@ -136,6 +136,8 @@ type mppAddr struct {
 	addr string
 }
 
+var _ kv.MPPTaskMeta = &mppAddr{}
+
 func (m *mppAddr) GetAddress() string {
 	return m.addr
 }

session/session.go

@@ -3339,14 +3339,6 @@ func BootstrapSession(store kv.Storage) (*domain.Domain, error) {
 		return nil, err
 	}
 
-	if config.GetGlobalConfig().DisaggregatedTiFlash {
-		// Invalid client-go tiflash_compute store cache if necessary.
-		err = dom.WatchTiFlashComputeNodeChange()
-		if err != nil {
-			return nil, err
-		}
-	}
-
 	if err = extensionimpl.Bootstrap(context.Background(), dom); err != nil {
 		return nil, err
 	}

store/copr/BUILD.bazel

@@ -31,6 +31,7 @@ go_library(
         "//util/mathutil",
         "//util/memory",
         "//util/paging",
+        "//util/tiflashcompute",
         "//util/trxevents",
         "@com_github_dgraph_io_ristretto//:ristretto",
         "@com_github_gogo_protobuf//proto",
@@ -44,6 +45,7 @@ go_library(
         "@com_github_pingcap_kvproto//pkg/mpp",
         "@com_github_pingcap_log//:log",
         "@com_github_pingcap_tipb//go-tipb",
+        "@com_github_stathat_consistent//:consistent",
         "@com_github_tikv_client_go_v2//config",
         "@com_github_tikv_client_go_v2//error",
         "@com_github_tikv_client_go_v2//metrics",
@@ -77,6 +79,7 @@ go_test(
         "//kv",
         "//store/driver/backoff",
         "//testkit/testsetup",
+        "//util/logutil",
         "//util/paging",
         "//util/trxevents",
         "@com_github_pingcap_errors//:errors",
@@ -89,5 +92,6 @@ go_test(
         "@com_github_tikv_client_go_v2//tikv",
         "@com_github_tikv_client_go_v2//tikvrpc",
         "@org_uber_go_goleak//:goleak",
+        "@org_uber_go_zap//:zap",
     ],
 )