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statistics: split async load package (#53318)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| load("@io_bazel_rules_go//go:def.bzl", "go_library") | ||
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| go_library( | ||
| name = "asyncload", | ||
| srcs = ["async_load.go"], | ||
| importpath = "github.com/pingcap/tidb/pkg/statistics/asyncload", | ||
| visibility = ["//visibility:public"], | ||
| deps = ["//pkg/parser/model"], | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| // 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. | ||
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| package asyncload | ||
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| import ( | ||
| "sync" | ||
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| "github.com/pingcap/tidb/pkg/parser/model" | ||
| ) | ||
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| // AsyncLoadHistogramNeededItems stores the columns/indices whose Histograms need to be loaded from physical kv layer. | ||
| // Currently, we only load index/pk's Histogram from kv automatically. Columns' are loaded by needs. | ||
| var AsyncLoadHistogramNeededItems = newNeededStatsMap() | ||
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| type neededStatsInternalMap struct { | ||
| // the bool value indicates whether is a full load or not. | ||
| items map[model.TableItemID]bool | ||
| m sync.RWMutex | ||
| } | ||
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| func (n *neededStatsInternalMap) AllItems() []model.StatsLoadItem { | ||
| n.m.RLock() | ||
| keys := make([]model.StatsLoadItem, 0, len(n.items)) | ||
| for key, val := range n.items { | ||
| keys = append(keys, model.StatsLoadItem{ | ||
| TableItemID: key, | ||
| FullLoad: val, | ||
| }) | ||
| } | ||
| n.m.RUnlock() | ||
| return keys | ||
| } | ||
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| func (n *neededStatsInternalMap) Insert(col model.TableItemID, fullLoad bool) { | ||
| n.m.Lock() | ||
| cur := n.items[col] | ||
| if cur { | ||
| // If the existing one is full load. We don't need to update it. | ||
| n.m.Unlock() | ||
| return | ||
| } | ||
| n.items[col] = fullLoad | ||
| // Otherwise, we could safely update it. | ||
| n.m.Unlock() | ||
| } | ||
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| func (n *neededStatsInternalMap) Delete(col model.TableItemID) { | ||
| n.m.Lock() | ||
| delete(n.items, col) | ||
| n.m.Unlock() | ||
| } | ||
|
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| func (n *neededStatsInternalMap) Length() int { | ||
| n.m.RLock() | ||
| defer n.m.RUnlock() | ||
| return len(n.items) | ||
| } | ||
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| const shardCnt = 128 | ||
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| type neededStatsMap struct { | ||
| items [shardCnt]neededStatsInternalMap | ||
| } | ||
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| func getIdx(tbl model.TableItemID) int64 { | ||
| var id int64 | ||
| if tbl.ID < 0 { | ||
| id = -tbl.ID | ||
| } else { | ||
| id = tbl.ID | ||
| } | ||
| return id % shardCnt | ||
| } | ||
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| func newNeededStatsMap() *neededStatsMap { | ||
| result := neededStatsMap{} | ||
| for i := 0; i < shardCnt; i++ { | ||
| result.items[i] = neededStatsInternalMap{ | ||
| items: make(map[model.TableItemID]bool), | ||
| } | ||
| } | ||
| return &result | ||
| } | ||
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| func (n *neededStatsMap) AllItems() []model.StatsLoadItem { | ||
| var result []model.StatsLoadItem | ||
| for i := 0; i < shardCnt; i++ { | ||
| keys := n.items[i].AllItems() | ||
| result = append(result, keys...) | ||
| } | ||
| return result | ||
| } | ||
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| func (n *neededStatsMap) Insert(col model.TableItemID, fullLoad bool) { | ||
| n.items[getIdx(col)].Insert(col, fullLoad) | ||
| } | ||
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| func (n *neededStatsMap) Delete(col model.TableItemID) { | ||
| n.items[getIdx(col)].Delete(col) | ||
| } | ||
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| func (n *neededStatsMap) Length() int { | ||
| var result int | ||
| for i := 0; i < shardCnt; i++ { | ||
| result += n.items[i].Length() | ||
| } | ||
| return result | ||
| } |
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