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stats: implement stats handler for DDL notifier part 1 (#56419)
ref #55722
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,221 @@ | ||
| // Copyright 2024 PingCAP, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package ddl | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/pingcap/errors" | ||
| "github.com/pingcap/tidb/pkg/ddl/notifier" | ||
| "github.com/pingcap/tidb/pkg/meta/model" | ||
| "github.com/pingcap/tidb/pkg/sessionctx" | ||
| "github.com/pingcap/tidb/pkg/sessionctx/variable" | ||
| "github.com/pingcap/tidb/pkg/statistics/handle/history" | ||
| "github.com/pingcap/tidb/pkg/statistics/handle/logutil" | ||
| "github.com/pingcap/tidb/pkg/statistics/handle/storage" | ||
| "github.com/pingcap/tidb/pkg/statistics/handle/types" | ||
| "github.com/pingcap/tidb/pkg/statistics/handle/util" | ||
| "github.com/pingcap/tidb/pkg/util/intest" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| type handler struct { | ||
| statsCache types.StatsCache | ||
| } | ||
|
|
||
| // NewHandlerAndRegister creates a new handler and registers it to the DDL | ||
| // notifier. | ||
| func NewHandlerAndRegister(statsCache types.StatsCache) { | ||
| h := handler{statsCache: statsCache} | ||
| notifier.RegisterHandler(notifier.StatsMetaHandlerID, h.handle) | ||
| } | ||
|
|
||
| func (h handler) handle( | ||
| ctx context.Context, | ||
| sctx sessionctx.Context, | ||
| change *notifier.SchemaChangeEvent, | ||
| ) error { | ||
| switch change.GetType() { | ||
| case model.ActionCreateTable: | ||
| info := change.GetCreateTableInfo() | ||
| ids, err := getPhysicalIDs(sctx, info) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| for _, id := range ids { | ||
| err = h.insertStats4PhysicalID(ctx, sctx, info, id) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| } | ||
| case model.ActionTruncateTable: | ||
| newTableInfo, droppedTableInfo := change.GetTruncateTableInfo() | ||
| ids, err := getPhysicalIDs(sctx, newTableInfo) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| for _, id := range ids { | ||
| err = h.insertStats4PhysicalID(ctx, sctx, newTableInfo, id) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| } | ||
|
|
||
| // Remove the old table stats. | ||
| droppedIDs, err2 := getPhysicalIDs(sctx, droppedTableInfo) | ||
| if err2 != nil { | ||
| return err2 | ||
| } | ||
| for _, id := range droppedIDs { | ||
| err2 = h.delayedDeleteStats4PhysicalID(ctx, sctx, id) | ||
| if err2 != nil { | ||
| return errors.Trace(err2) | ||
| } | ||
| } | ||
| case model.ActionDropTable: | ||
| droppedTableInfo := change.GetDropTableInfo() | ||
| ids, err := getPhysicalIDs(sctx, droppedTableInfo) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| for _, id := range ids { | ||
| err = h.delayedDeleteStats4PhysicalID(ctx, sctx, id) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| } | ||
| case model.ActionAddColumn: | ||
| // TODO: implement me | ||
| case model.ActionModifyColumn: | ||
| // TODO: implement me | ||
| case model.ActionAddTablePartition: | ||
| // TODO: implement me | ||
| case model.ActionTruncateTablePartition: | ||
| // TODO: implement me | ||
| case model.ActionDropTablePartition: | ||
| // TODO: implement me | ||
| case model.ActionExchangeTablePartition: | ||
| // TODO: implement me | ||
| case model.ActionReorganizePartition: | ||
| // TODO: implement me | ||
| case model.ActionAlterTablePartitioning: | ||
| // TODO: implement me | ||
| case model.ActionRemovePartitioning: | ||
| // TODO: implement me | ||
| case model.ActionFlashbackCluster: | ||
| // TODO: implement me | ||
| default: | ||
| intest.Assert(false) | ||
| logutil.StatsLogger().Error("Unhandled schema change event", | ||
| zap.Stringer("type", change)) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (h handler) insertStats4PhysicalID( | ||
| ctx context.Context, | ||
| sctx sessionctx.Context, | ||
| info *model.TableInfo, | ||
| id int64, | ||
| ) error { | ||
| startTS, err := storage.InsertTableStats2KV(ctx, sctx, info, id) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| return errors.Trace(h.recordHistoricalStatsMeta(ctx, sctx, id, startTS)) | ||
| } | ||
|
|
||
| func (h handler) recordHistoricalStatsMeta( | ||
| ctx context.Context, | ||
| sctx sessionctx.Context, | ||
| id int64, | ||
| startTS uint64, | ||
| ) error { | ||
| if startTS == 0 { | ||
| return nil | ||
| } | ||
| enableHistoricalStats, err2 := getEnableHistoricalStats(sctx) | ||
| if err2 != nil { | ||
| return err2 | ||
| } | ||
| if !enableHistoricalStats { | ||
| return nil | ||
| } | ||
|
|
||
| tbl, ok := h.statsCache.Get(id) | ||
| if !ok || !tbl.IsInitialized() { | ||
| return nil | ||
| } | ||
|
|
||
| return history.RecordHistoricalStatsMeta( | ||
| ctx, | ||
| sctx, | ||
| id, | ||
| startTS, | ||
| util.StatsMetaHistorySourceSchemaChange, | ||
| ) | ||
| } | ||
|
|
||
| func (h handler) delayedDeleteStats4PhysicalID( | ||
| ctx context.Context, | ||
| sctx sessionctx.Context, | ||
| id int64, | ||
| ) error { | ||
| startTS, err2 := storage.UpdateStatsMetaVersionForGC(ctx, sctx, id) | ||
| if err2 != nil { | ||
| return errors.Trace(err2) | ||
| } | ||
| return errors.Trace(h.recordHistoricalStatsMeta(ctx, sctx, id, startTS)) | ||
| } | ||
|
|
||
| func getPhysicalIDs( | ||
| sctx sessionctx.Context, | ||
| tblInfo *model.TableInfo, | ||
| ) (ids []int64, err error) { | ||
| pi := tblInfo.GetPartitionInfo() | ||
| if pi == nil { | ||
| return []int64{tblInfo.ID}, nil | ||
| } | ||
| ids = make([]int64, 0, len(pi.Definitions)+1) | ||
| for _, def := range pi.Definitions { | ||
| ids = append(ids, def.ID) | ||
| } | ||
| pruneMode, err := getCurrentPruneMode(sctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if pruneMode == variable.Dynamic { | ||
| ids = append(ids, tblInfo.ID) | ||
| } | ||
| return ids, nil | ||
| } | ||
|
|
||
| func getCurrentPruneMode( | ||
| sctx sessionctx.Context, | ||
| ) (variable.PartitionPruneMode, error) { | ||
| pruneMode, err := sctx.GetSessionVars(). | ||
| GlobalVarsAccessor. | ||
| GetGlobalSysVar(variable.TiDBPartitionPruneMode) | ||
| return variable.PartitionPruneMode(pruneMode), errors.Trace(err) | ||
| } | ||
|
|
||
| func getEnableHistoricalStats( | ||
| sctx sessionctx.Context, | ||
| ) (bool, error) { | ||
| val, err := sctx.GetSessionVars(). | ||
| GlobalVarsAccessor. | ||
| GetGlobalSysVar(variable.TiDBEnableHistoricalStats) | ||
| return variable.TiDBOptOn(val), errors.Trace(err) | ||
| } |
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