*: Support show current background job info

ddl/bg_worker_test.go

@@ -32,7 +32,6 @@ func (s *testDDLSuite) TestDropSchemaError(c *C) {
 	defer d.close()
 
 	job := &model.Job{
-		ID:       1,
 		SchemaID: 1,
 		Type:     model.ActionDropSchema,
 		Args: []interface{}{&model.DBInfo{
@@ -69,7 +68,6 @@ func (s *testDDLSuite) TestDropTableError(c *C) {
 	testCreateSchema(c, mock.NewContext(), d, dbInfo)
 
 	job := &model.Job{
-		ID:       1,
 		SchemaID: dbInfo.ID,
 		Type:     model.ActionDropTable,
 		Args: []interface{}{&model.TableInfo{

ddl/ddl_worker.go

@@ -115,7 +115,7 @@ func (d *ddl) checkOwner(t *meta.Meta, flag JobType) (*model.Owner, error) {
 	case bgJobFlag:
 		owner, err = t.GetBgJobOwner()
 	default:
-		err = errors.Errorf("invalid ddl flag %v", flag)
+		err = errInvalidJobFlag
 	}
 	if err != nil {
 		return nil, errors.Trace(err)
@@ -191,6 +191,8 @@ var ErrNotOwner = errors.New("DDL: not owner")
 // ErrWorkerClosed means we have already closed the DDL worker.
 var ErrWorkerClosed = errors.New("DDL: worker is closed")
 
+var errInvalidJobFlag = errors.New("DDL: invalid job flag")
+
 // JobType is job type, including ddl/background.
 type JobType int
 

ddl/stat.go

@@ -21,7 +21,7 @@ import (
 )
 
 var (
-	ddlServerID          = "ddl_server_id"
+	serverID             = "server_id"
 	ddlSchemaVersion     = "ddl_schema_version"
 	ddlOwnerID           = "ddl_owner_id"
 	ddlOwnerLastUpdateTS = "ddl_owner_last_update_ts"
@@ -36,6 +36,20 @@ var (
 	ddlJobSnapshotVer    = "ddl_job_snapshot_ver"
 	ddlJobReorgHandle    = "ddl_job_reorg_handle"
 	ddlJobArgs           = "ddl_job_args"
+	bgSchemaVersion      = "bg_schema_version"
+	bgOwnerID            = "bg_owner_id"
+	bgOwnerLastUpdateTS  = "bg_owner_last_update_ts"
+	bgJobID              = "bg_job_id"
+	bgJobAction          = "bg_job_action"
+	bgJobLastUpdateTS    = "bg_job_last_update_ts"
+	bgJobState           = "bg_job_state"
+	bgJobError           = "bg_job_error"
+	bgJobSchemaState     = "bg_job_schema_state"
+	bgJobSchemaID        = "bg_job_schema_id"
+	bgJobTableID         = "bg_job_table_id"
+	bgJobSnapshotVer     = "bg_job_snapshot_ver"
+	bgJobReorgHandle     = "bg_job_reorg_handle"
+	bgJobArgs            = "bg_job_args"
 )
 
 // GetScope gets the status variables scope.
@@ -46,40 +60,63 @@ func (d *ddl) GetScope(status string) variable.ScopeFlag {
 
 // Stat returns the DDL statistics.
 func (d *ddl) Stats() (map[string]interface{}, error) {
-	var info *inspectkv.DDLInfo
+	m := make(map[string]interface{})
+	m[serverID] = d.uuid
+	var ddlInfo, bgInfo *inspectkv.DDLInfo
+
 	err := kv.RunInNewTxn(d.store, false, func(txn kv.Transaction) error {
 		var err1 error
-		info, err1 = inspectkv.GetDDLInfo(txn)
+		ddlInfo, err1 = inspectkv.GetDDLInfo(txn)
+		if err1 != nil {
+			return errors.Trace(err1)
+		}
+		bgInfo, err1 = inspectkv.GetDDLBgInfo(txn)
 
 		return errors.Trace(err1)
 	})
 	if err != nil {
 		return nil, errors.Trace(err)
 	}
 
-	m := make(map[string]interface{})
-	m[ddlServerID] = d.uuid
-
-	m[ddlSchemaVersion] = info.SchemaVer
-
-	if info.Owner != nil {
-		m[ddlOwnerID] = info.Owner.OwnerID
+	m[ddlSchemaVersion] = ddlInfo.SchemaVer
+	if ddlInfo.Owner != nil {
+		m[ddlOwnerID] = ddlInfo.Owner.OwnerID
 		// LastUpdateTS uses nanosecond.
-		m[ddlOwnerLastUpdateTS] = info.Owner.LastUpdateTS / 1e9
+		m[ddlOwnerLastUpdateTS] = ddlInfo.Owner.LastUpdateTS / 1e9
+	}
+	if ddlInfo.Job != nil {
+		m[ddlJobID] = ddlInfo.Job.ID
+		m[ddlJobAction] = ddlInfo.Job.Type.String()
+		m[ddlJobLastUpdateTS] = ddlInfo.Job.LastUpdateTS / 1e9
+		m[ddlJobState] = ddlInfo.Job.State.String()
+		m[ddlJobError] = ddlInfo.Job.Error
+		m[ddlJobSchemaState] = ddlInfo.Job.SchemaState.String()
+		m[ddlJobSchemaID] = ddlInfo.Job.SchemaID
+		m[ddlJobTableID] = ddlInfo.Job.TableID
+		m[ddlJobSnapshotVer] = ddlInfo.Job.SnapshotVer
+		m[ddlJobReorgHandle] = ddlInfo.ReorgHandle
+		m[ddlJobArgs] = ddlInfo.Job.Args
 	}
 
-	if info.Job != nil {
-		m[ddlJobID] = info.Job.ID
-		m[ddlJobAction] = info.Job.Type.String()
-		m[ddlJobLastUpdateTS] = info.Job.LastUpdateTS / 1e9
-		m[ddlJobState] = info.Job.State.String()
-		m[ddlJobError] = info.Job.Error
-		m[ddlJobSchemaState] = info.Job.SchemaState.String()
-		m[ddlJobSchemaID] = info.Job.SchemaID
-		m[ddlJobTableID] = info.Job.TableID
-		m[ddlJobSnapshotVer] = info.Job.SnapshotVer
-		m[ddlJobReorgHandle] = info.ReorgHandle
-		m[ddlJobArgs] = info.Job.Args
+	// background DDL info
+	m[bgSchemaVersion] = bgInfo.SchemaVer
+	if bgInfo.Owner != nil {
+		m[bgOwnerID] = bgInfo.Owner.OwnerID
+		// LastUpdateTS uses nanosecond.
+		m[bgOwnerLastUpdateTS] = bgInfo.Owner.LastUpdateTS / 1e9
+	}
+	if bgInfo.Job != nil {
+		m[bgJobID] = bgInfo.Job.ID
+		m[bgJobAction] = bgInfo.Job.Type.String()
+		m[bgJobLastUpdateTS] = bgInfo.Job.LastUpdateTS / 1e9
+		m[bgJobState] = bgInfo.Job.State.String()
+		m[bgJobError] = bgInfo.Job.Error
+		m[bgJobSchemaState] = bgInfo.Job.SchemaState.String()
+		m[bgJobSchemaID] = bgInfo.Job.SchemaID
+		m[bgJobTableID] = bgInfo.Job.TableID
+		m[bgJobSnapshotVer] = bgInfo.Job.SnapshotVer
+		m[bgJobReorgHandle] = bgInfo.ReorgHandle
+		m[bgJobArgs] = bgInfo.Job.Args
 	}
 
 	return m, nil

ddl/stat_test.go

@@ -26,7 +26,7 @@ var _ = Suite(&testStatSuite{})
 type testStatSuite struct {
 }
 
-func (s *testStatSuite) getSchemaVer(c *C, d *ddl) int64 {
+func (s *testStatSuite) getDDLSchemaVer(c *C, d *ddl) int64 {
 	m, err := d.Stats()
 	c.Assert(err, IsNil)
 	v := m[ddlSchemaVersion]
@@ -45,14 +45,15 @@ func (s *testStatSuite) TestStat(c *C) {
 	time.Sleep(lease)
 
 	dbInfo := testSchemaInfo(c, d, "test")
+	testCreateSchema(c, mock.NewContext(), d, dbInfo)
 
 	m, err := d.Stats()
 	c.Assert(err, IsNil)
 	c.Assert(m[ddlOwnerID], Equals, d.uuid)
 
 	job := &model.Job{
 		SchemaID: dbInfo.ID,
-		Type:     model.ActionCreateSchema,
+		Type:     model.ActionDropSchema,
 		Args:     []interface{}{dbInfo.Name},
 	}
 
@@ -65,16 +66,19 @@ func (s *testStatSuite) TestStat(c *C) {
 	ticker := time.NewTicker(d.lease * 1)
 	defer ticker.Stop()
 
-	ver := s.getSchemaVer(c, d)
+	ver := s.getDDLSchemaVer(c, d)
 LOOP:
 	for {
 		select {
 		case <-ticker.C:
 			d.close()
-			c.Assert(s.getSchemaVer(c, d), GreaterEqual, ver)
+			c.Assert(s.getDDLSchemaVer(c, d), GreaterEqual, ver)
 			d.start()
 		case err := <-done:
 			c.Assert(err, IsNil)
+			m, err := d.Stats()
+			c.Assert(err, IsNil)
+			c.Assert(m[bgOwnerID], Equals, d.uuid)
 			break LOOP
 		}
 	}

inspectkv/inspectkv.go

@@ -30,7 +30,7 @@ import (
 // DDLInfo is for DDL information.
 type DDLInfo struct {
 	SchemaVer   int64
-	ReorgHandle int64
+	ReorgHandle int64 // it's only used for DDL information.
 	Owner       *model.Owner
 	Job         *model.Job
 }
@@ -65,6 +65,28 @@ func GetDDLInfo(txn kv.Transaction) (*DDLInfo, error) {
 	return info, nil
 }
 
+// GetDDLBgInfo returns DDL background information.
+func GetDDLBgInfo(txn kv.Transaction) (*DDLInfo, error) {
+	var err error
+	info := &DDLInfo{}
+	t := meta.NewMeta(txn)
+
+	info.Owner, err = t.GetBgJobOwner()
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+	info.Job, err = t.GetBgJob(0)
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+	info.SchemaVer, err = t.GetSchemaVersion()
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+
+	return info, nil
+}
+
 func nextIndexVals(data []interface{}) []interface{} {
 	// Add 0x0 to the end of data.
 	return append(data, nil)

inspectkv/inspectkv_test.go

@@ -152,6 +152,29 @@ func (s *testSuite) TestGetDDLInfo(c *C) {
 	c.Assert(err, IsNil)
 }
 
+func (s *testSuite) TestGetDDLBgInfo(c *C) {
+	txn, err := s.store.Begin()
+	c.Assert(err, IsNil)
+	t := meta.NewMeta(txn)
+
+	owner := &model.Owner{OwnerID: "owner"}
+	err = t.SetBgJobOwner(owner)
+	c.Assert(err, IsNil)
+	job := &model.Job{
+		SchemaID: 1,
+		Type:     model.ActionDropTable,
+	}
+	err = t.EnQueueBgJob(job)
+	c.Assert(err, IsNil)
+	info, err := GetDDLBgInfo(txn)
+	c.Assert(err, IsNil)
+	c.Assert(info.Owner, DeepEquals, owner)
+	c.Assert(info.Job, DeepEquals, job)
+	c.Assert(info.ReorgHandle, Equals, int64(0))
+	err = txn.Commit()
+	c.Assert(err, IsNil)
+}
+
 func (s *testSuite) TestScan(c *C) {
 	alloc := autoid.NewAllocator(s.store, s.dbInfo.ID)
 	tb, err := tables.TableFromMeta(alloc, s.tbInfo)