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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // Copyright 2020 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, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package executor | ||
|
|
||
| import ( | ||
| "github.com/cznic/mathutil" | ||
| "github.com/pingcap/tidb/sessionctx" | ||
| "github.com/pingcap/tidb/util/chunk" | ||
| "github.com/pingcap/tidb/util/kvcache" | ||
| "github.com/pingcap/tidb/util/memory" | ||
| "github.com/pingcap/tidb/util/stringutil" | ||
| ) | ||
|
|
||
| // applyCache is used in the apply executor. When we get the same value of the outer row. | ||
| // We fetch the inner rows in the cache not to fetch them in the inner executor. | ||
| type applyCache struct { | ||
| cache *kvcache.SimpleLRUCache | ||
| memCapacity int64 | ||
| memTracker *memory.Tracker // track memory usage. | ||
| } | ||
|
|
||
| type applyCacheKey []byte | ||
|
|
||
| func (key applyCacheKey) Hash() []byte { | ||
| return key | ||
| } | ||
|
|
||
| func applyCacheKVMem(key applyCacheKey, value *chunk.List) int64 { | ||
| return int64(len(key)) + value.GetMemTracker().BytesConsumed() | ||
| } | ||
|
|
||
| func newApplyCache(ctx sessionctx.Context) (*applyCache, error) { | ||
| // since applyCache controls the memory usage by itself, set the capacity of | ||
| // the underlying LRUCache to max to close its memory control | ||
| cache := kvcache.NewSimpleLRUCache(mathutil.MaxUint, 0.1, 0) | ||
| c := applyCache{ | ||
| cache: cache, | ||
| memCapacity: ctx.GetSessionVars().NestedLoopJoinCacheCapacity, | ||
| memTracker: memory.NewTracker(stringutil.StringerStr("applyCache"), -1), | ||
| } | ||
| return &c, nil | ||
| } | ||
|
|
||
| // Get gets a cache item according to cache key. | ||
| func (c *applyCache) Get(key applyCacheKey) (*chunk.List, error) { | ||
| value, hit := c.cache.Get(&key) | ||
| if !hit { | ||
| return nil, nil | ||
| } | ||
| typedValue := value.(*chunk.List) | ||
| return typedValue, nil | ||
| } | ||
|
|
||
| // Set inserts an item to the cache. | ||
| func (c *applyCache) Set(key applyCacheKey, value *chunk.List) (bool, error) { | ||
| mem := applyCacheKVMem(key, value) | ||
| if mem > c.memCapacity { // ignore this kv pair if its size is too large | ||
| return false, nil | ||
| } | ||
| for mem+c.memTracker.BytesConsumed() > c.memCapacity { | ||
| evictedKey, evictedValue, evicted := c.cache.RemoveOldest() | ||
| if !evicted { | ||
| return false, nil | ||
| } | ||
| c.memTracker.Consume(-applyCacheKVMem(evictedKey.(applyCacheKey), evictedValue.(*chunk.List))) | ||
| } | ||
| c.memTracker.Consume(mem) | ||
| c.cache.Put(key, value) | ||
| return true, nil | ||
| } | ||
|
|
||
| // GetMemTracker returns the memory tracker of this apply cache. | ||
| func (c *applyCache) GetMemTracker() *memory.Tracker { | ||
| return c.memTracker | ||
| } |
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