dm: add a stand-alone load mode

dm/_utils/terror_gen/errors_release.txt

@@ -152,7 +152,7 @@ ErrConfigLoaderCfgConflict,[code=20016:class=config:scope=internal:level=medium]
 ErrConfigSyncerCfgConflict,[code=20017:class=config:scope=internal:level=medium], "Message: syncer-config-name and syncer should only specify one, Workaround: Please check the `syncer-config-name` and `syncer` config in task configuration file."
 ErrConfigReadCfgFromFile,[code=20018:class=config:scope=internal:level=medium], "Message: read config file %v"
 ErrConfigNeedUniqueTaskName,[code=20019:class=config:scope=internal:level=medium], "Message: must specify a unique task name, Workaround: Please check the `name` config in task configuration file."
-ErrConfigInvalidTaskMode,[code=20020:class=config:scope=internal:level=medium], "Message: please specify right task-mode, support `full`, `incremental`, `all`, Workaround: Please check the `task-mode` config in task configuration file."
+ErrConfigInvalidTaskMode,[code=20020:class=config:scope=internal:level=medium], "Message: please specify right task-mode, support `full`, `incremental`, `all`, `dump`, `load`, Workaround: Please check the `task-mode` config in task configuration file."
 ErrConfigNeedTargetDB,[code=20021:class=config:scope=internal:level=medium], "Message: must specify target-database, Workaround: Please check the `target-database` config in task configuration file."
 ErrConfigMetadataNotSet,[code=20022:class=config:scope=internal:level=medium], "Message: mysql-instance(%s) must set meta for task-mode %s, Workaround: Please check the `meta` config in task configuration file."
 ErrConfigRouteRuleNotFound,[code=20023:class=config:scope=internal:level=medium], "Message: mysql-instance(%d)'s route-rules %s not exist in routes, Workaround: Please check the `route-rules` config in task configuration file."

dm/config/helper.go

@@ -26,7 +26,7 @@ func HasDump(taskMode string) bool {
 // HasLoad returns true if taskMode contains load unit.
 func HasLoad(taskMode string) bool {
 	switch taskMode {
-	case ModeAll, ModeFull, ModeLoadSync:
+	case ModeAll, ModeFull, ModeLoad, ModeLoadSync:
 		return true
 	default:
 		return false

dm/config/helper_test.go

@@ -36,6 +36,10 @@ func TestTaskModeHasFunction(t *testing.T) {
 	require.False(t, HasLoad(ModeDump))
 	require.False(t, HasSync(ModeDump))
 
+	require.False(t, HasDump(ModeLoad))
+	require.True(t, HasLoad(ModeLoad))
+	require.False(t, HasSync(ModeLoad))
+
 	require.False(t, HasDump(ModeLoadSync))
 	require.True(t, HasLoad(ModeLoadSync))
 	require.True(t, HasSync(ModeLoadSync))

dm/config/subtask.go

@@ -52,6 +52,7 @@ const (
 	ModeFull      = "full"
 	ModeIncrement = "incremental"
 	ModeDump      = "dump"
+	ModeLoad      = "load"
 	ModeLoadSync  = "load&sync"
 
 	DefaultShadowTableRules = "^_(.+)_(?:new|gho)$"
@@ -329,8 +330,9 @@ func (c *SubTaskConfig) Adjust(verifyDecryptPassword bool) error {
 		c.MetaSchema = defaultMetaSchema
 	}
 
-	// adjust dir, no need to do for load&sync mode because it needs its own s3 repository
-	if HasLoad(c.Mode) && c.Mode != ModeLoadSync {
+	// adjust dir. Do not do this for both load and load&sync mode, as they are standalone
+	// mode and should take LoaderConfig.Dir as is
+	if HasLoad(c.Mode) && c.Mode != ModeLoadSync && c.Mode != ModeLoad {
 		// check
 		isS3 := storage.IsS3Path(c.LoaderConfig.Dir)
 		if isS3 && c.ImportMode == LoadModeLoader {

dm/config/task.go

@@ -669,7 +669,7 @@
 		return terror.ErrConfigNeedUniqueTaskName.Generate()
 	}
 	switch c.TaskMode {
-	case ModeFull, ModeIncrement, ModeAll, ModeDump, ModeLoadSync:
+	case ModeFull, ModeIncrement, ModeAll, ModeDump, ModeLoad, ModeLoadSync:
 	default:
 		return terror.ErrConfigInvalidTaskMode.Generate()
 	}
@@ -774,9 +774,9 @@
 		instanceIDs[inst.SourceID] = i
 
 		switch c.TaskMode {
-		case ModeFull, ModeAll, ModeDump:
+		case ModeFull, ModeAll, ModeDump, ModeLoad:
 			if inst.Meta != nil {
-				log.L().Warn("metadata will not be used. for Full mode, incremental sync will never occur; for All mode, the meta dumped by MyDumper will be used", zap.Int("mysql instance", i), zap.String("task mode", c.TaskMode))
+				log.L().Warn("metadata will not be used. for Full/Dump/Load mode, incremental sync will never occur; for All mode, the meta dumped by MyDumper will be used", zap.Int("mysql instance", i), zap.String("task mode", c.TaskMode))
 			}
 		case ModeIncrement:
 			if inst.Meta == nil {

dm/errors.toml

@@ -929,7 +929,7 @@ workaround = "Please check the `name` config in task configuration file."
 tags = ["internal", "medium"]
 
 [error.DM-config-20020]
-message = "please specify right task-mode, support `full`, `incremental`, `all`"
+message = "please specify right task-mode, support `full`, `incremental`, `all`, `dump`, `load`"
 description = ""
 workaround = "Please check the `task-mode` config in task configuration file."
 tags = ["internal", "medium"]

dm/openapi/spec/dm.yaml

@@ -1826,6 +1826,7 @@ components:
             - "incremental"
             - "all"
             - "dump"
+            - "load"
         shard_mode:
           type: string
           description: the way to coordinate DDL

dm/pkg/terror/error_list.go

@@ -935,7 +935,7 @@ var (
 	ErrConfigSyncerCfgConflict      = New(codeConfigSyncerCfgConflict, ClassConfig, ScopeInternal, LevelMedium, "syncer-config-name and syncer should only specify one", "Please check the `syncer-config-name` and `syncer` config in task configuration file.")
 	ErrConfigReadCfgFromFile        = New(codeConfigReadCfgFromFile, ClassConfig, ScopeInternal, LevelMedium, "read config file %v", "")
 	ErrConfigNeedUniqueTaskName     = New(codeConfigNeedUniqueTaskName, ClassConfig, ScopeInternal, LevelMedium, "must specify a unique task name", "Please check the `name` config in task configuration file.")
-	ErrConfigInvalidTaskMode        = New(codeConfigInvalidTaskMode, ClassConfig, ScopeInternal, LevelMedium, "please specify right task-mode, support `full`, `incremental`, `all`", "Please check the `task-mode` config in task configuration file.")
+	ErrConfigInvalidTaskMode        = New(codeConfigInvalidTaskMode, ClassConfig, ScopeInternal, LevelMedium, "please specify right task-mode, support `full`, `incremental`, `all`, `dump`, `load`", "Please check the `task-mode` config in task configuration file.")
 	ErrConfigNeedTargetDB           = New(codeConfigNeedTargetDB, ClassConfig, ScopeInternal, LevelMedium, "must specify target-database", "Please check the `target-database` config in task configuration file.")
 	ErrConfigMetadataNotSet         = New(codeConfigMetadataNotSet, ClassConfig, ScopeInternal, LevelMedium, "mysql-instance(%s) must set meta for task-mode %s", "Please check the `meta` config in task configuration file.")
 	ErrConfigRouteRuleNotFound      = New(codeConfigRouteRuleNotFound, ClassConfig, ScopeInternal, LevelMedium, "mysql-instance(%d)'s route-rules %s not exist in routes", "Please check the `route-rules` config in task configuration file.")

dm/tests/openapi/client/openapi_task_check

@@ -4,6 +4,7 @@ import sys
 import requests
 
 SHARD_TASK_NAME = "test-shard"
+LOAD_TASK_NAME = "test-load"
 ILLEGAL_CHAR_TASK_NAME = "t-Ë!s`t"
 SOURCE1_NAME = "mysql-01"
 SOURCE2_NAME = "mysql-02"
@@ -308,6 +309,45 @@ def create_dump_task_success():
     print("create_dump_task_success resp=", resp.json())
     assert resp.status_code == 201
 
+def create_load_task_success():
+    task = {
+        "name": LOAD_TASK_NAME,
+        "task_mode": "load",
+        "meta_schema": "dm-meta",
+        "enhance_online_schema_change": True,
+        "on_duplicate": "error",
+        "target_config": {
+            "host": "127.0.0.1",
+            "port": 4000,
+            "user": "root",
+            "password": "",
+        },
+        "table_migrate_rule": [
+            {
+                "source": {
+                    "source_name": SOURCE1_NAME,
+                    "schema": "openapi",
+                    "table": "*",
+                },
+                "target": {"schema": "openapi", "table": "t"},
+            }
+        ],
+        "source_config": {
+            "full_migrate_conf": {
+                "export_threads": 4,
+                "import_threads": 16,
+                "data_dir": "./exported_data",
+                "consistency": "auto",
+            },
+            "source_conf": [
+                {"source_name": SOURCE1_NAME}
+            ],
+        },
+    }
+    resp = requests.post(url=API_ENDPOINT, json={"task": task})
+    print("create_load_task_success resp=", resp.json())
+    assert resp.status_code == 201
+
 def start_task_success(task_name, source_name):
     url = API_ENDPOINT + "/" + task_name + "/start"
     req = {}
@@ -743,6 +783,7 @@ if __name__ == "__main__":
         "create_noshard_task_success": create_noshard_task_success,
         "create_shard_task_success": create_shard_task_success,
         "create_dump_task_success": create_dump_task_success,
+        "create_load_task_success": create_load_task_success,
         "create_incremental_task_with_gtid_success": create_incremental_task_with_gtid_success,
         "delete_task_failed": delete_task_failed,
         "delete_task_success": delete_task_success,