tidb disk_root 源码
tidb disk_root 代码
文件路径：/ddl/ingest/disk_root.go
// Copyright 2022 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 ingest
import (
"github.com/pingcap/errors"
lcom "github.com/pingcap/tidb/br/pkg/lightning/common"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/util/logutil"
"github.com/pingcap/tidb/util/mathutil"
"go.uber.org/zap"
)
// DiskRoot is used to track the disk usage for the lightning backfill process.
type DiskRoot interface {
CurrentUsage() uint64
MaxQuota() uint64
UpdateUsageAndQuota() error
}
const capacityThreshold = 0.9
// diskRootImpl implements DiskRoot interface.
type diskRootImpl struct {
path string
currentUsage uint64
maxQuota uint64
bcCtx *backendCtxManager
}
// NewDiskRootImpl creates a new DiskRoot.
func NewDiskRootImpl(path string, bcCtx *backendCtxManager) DiskRoot {
return &diskRootImpl{
path: path,
bcCtx: bcCtx,
}
}
// CurrentUsage implements DiskRoot interface.
func (d *diskRootImpl) CurrentUsage() uint64 {
return d.currentUsage
}
// MaxQuota implements DiskRoot interface.
func (d *diskRootImpl) MaxQuota() uint64 {
return d.maxQuota
}
// UpdateUsageAndQuota implements DiskRoot interface.
func (d *diskRootImpl) UpdateUsageAndQuota() error {
d.currentUsage = d.bcCtx.TotalDiskUsage()
sz, err := lcom.GetStorageSize(d.path)
if err != nil {
logutil.BgLogger().Error(LitErrGetStorageQuota, zap.Error(err))
return errors.New(LitErrGetStorageQuota)
}
d.maxQuota = mathutil.Min(variable.DDLDiskQuota.Load(), uint64(capacityThreshold*float64(sz.Capacity)))
return nil
}
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