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*: sync wait stats loading for stable plan (#30026)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| // Copyright 2021 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 core | ||
|
|
||
| import ( | ||
| "context" | ||
| "time" | ||
|
|
||
| "github.com/cznic/mathutil" | ||
| "github.com/pingcap/errors" | ||
| "github.com/pingcap/tidb/domain" | ||
| "github.com/pingcap/tidb/parser/model" | ||
| "github.com/pingcap/tidb/sessionctx" | ||
| "github.com/pingcap/tidb/sessionctx/stmtctx" | ||
| "github.com/pingcap/tidb/sessionctx/variable" | ||
| ) | ||
|
|
||
| type collectPredicateColumnsPoint struct{} | ||
|
|
||
| func (c collectPredicateColumnsPoint) optimize(ctx context.Context, plan LogicalPlan, op *logicalOptimizeOp) (LogicalPlan, error) { | ||
| if plan.SCtx().GetSessionVars().InRestrictedSQL { | ||
| return plan, nil | ||
| } | ||
| predicateNeeded := variable.EnableColumnTracking.Load() | ||
| syncWait := plan.SCtx().GetSessionVars().StatsLoadSyncWait * time.Millisecond.Nanoseconds() | ||
| histNeeded := syncWait > 0 | ||
| predicateColumns, histNeededColumns := CollectColumnStatsUsage(plan, predicateNeeded, histNeeded) | ||
| if len(predicateColumns) > 0 { | ||
| plan.SCtx().UpdateColStatsUsage(predicateColumns) | ||
| } | ||
| if histNeeded && len(histNeededColumns) > 0 { | ||
| err := RequestLoadColumnStats(plan.SCtx(), histNeededColumns, syncWait) | ||
| return plan, err | ||
| } | ||
| return plan, nil | ||
| } | ||
|
|
||
| func (c collectPredicateColumnsPoint) name() string { | ||
| return "collect_predicate_columns_point" | ||
| } | ||
|
|
||
| type syncWaitStatsLoadPoint struct{} | ||
|
|
||
| func (s syncWaitStatsLoadPoint) optimize(ctx context.Context, plan LogicalPlan, op *logicalOptimizeOp) (LogicalPlan, error) { | ||
| if plan.SCtx().GetSessionVars().InRestrictedSQL { | ||
| return plan, nil | ||
| } | ||
| _, err := SyncWaitStatsLoad(plan) | ||
| return plan, err | ||
| } | ||
|
|
||
| func (s syncWaitStatsLoadPoint) name() string { | ||
| return "sync_wait_stats_load_point" | ||
| } | ||
|
|
||
| const maxDuration = 1<<63 - 1 | ||
|
|
||
| // RequestLoadColumnStats send requests to stats handle | ||
| func RequestLoadColumnStats(ctx sessionctx.Context, neededColumns []model.TableColumnID, syncWait int64) error { | ||
| stmtCtx := ctx.GetSessionVars().StmtCtx | ||
| hintMaxExecutionTime := int64(stmtCtx.MaxExecutionTime) | ||
| if hintMaxExecutionTime <= 0 { | ||
| hintMaxExecutionTime = maxDuration | ||
| } | ||
| sessMaxExecutionTime := int64(ctx.GetSessionVars().MaxExecutionTime) | ||
| if sessMaxExecutionTime <= 0 { | ||
| sessMaxExecutionTime = maxDuration | ||
| } | ||
| waitTime := mathutil.MinInt64(syncWait, mathutil.MinInt64(hintMaxExecutionTime, sessMaxExecutionTime)) | ||
| var timeout = time.Duration(waitTime) | ||
| err := domain.GetDomain(ctx).StatsHandle().SendLoadRequests(stmtCtx, neededColumns, timeout) | ||
| if err != nil { | ||
| return handleTimeout(stmtCtx) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // SyncWaitStatsLoad sync-wait for stats load until timeout | ||
| func SyncWaitStatsLoad(plan LogicalPlan) (bool, error) { | ||
| stmtCtx := plan.SCtx().GetSessionVars().StmtCtx | ||
| if stmtCtx.StatsLoad.Fallback { | ||
| return false, nil | ||
| } | ||
| success := domain.GetDomain(plan.SCtx()).StatsHandle().SyncWaitStatsLoad(stmtCtx) | ||
| if success { | ||
| return true, nil | ||
| } | ||
| err := handleTimeout(stmtCtx) | ||
| return false, err | ||
| } | ||
|
|
||
| func handleTimeout(stmtCtx *stmtctx.StatementContext) error { | ||
| err := errors.New("Timeout when sync-load full stats for needed columns") | ||
| if variable.StatsLoadPseudoTimeout.Load() { | ||
| stmtCtx.AppendWarning(err) | ||
| stmtCtx.StatsLoad.Fallback = true | ||
| return nil | ||
| } | ||
| return err | ||
| } |
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