tidb common 源码
tidb common 代码
文件路径：/ddl/placement/common.go
// 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 placement
import (
"fmt"
)
const (
// TiFlashRuleGroupID is the rule group id of tiflash
TiFlashRuleGroupID = "tiflash"
// BundleIDPrefix is the bundle prefix of all rule bundles from TiDB_DDL statements.
BundleIDPrefix = "TiDB_DDL_"
// PDBundleID is the bundle name of pd, the default bundle for all regions.
PDBundleID = "pd"
)
// GroupID accepts a tableID or whatever integer, and encode the integer into a valid GroupID for PD.
func GroupID(id int64) string {
return fmt.Sprintf("%s%d", BundleIDPrefix, id)
}
const (
// RuleIndexTable is the index for a rule of table.
RuleIndexTable = 40
// RuleIndexPartition is the index for a rule of partition.
RuleIndexPartition = 80
// RuleIndexTiFlash is the index for a rule of TiFlash.
RuleIndexTiFlash = 120
)
const (
// DCLabelKey indicates the key of label which represents the dc for Store.
// FIXME: currently we assumes "zone" is the dcLabel key in Store
DCLabelKey = "zone"
// EngineLabelKey is the label that indicates the backend of store instance:
// tikv or tiflash. TiFlash instance will contain a label of 'engine: tiflash'.
EngineLabelKey = "engine"
// EngineLabelTiFlash is the label value, which a TiFlash instance will have with
// a label key of EngineLabelKey.
EngineLabelTiFlash = "tiflash"
// EngineLabelTiKV is the label value used in some tests. And possibly TiKV will
// set the engine label with a value of EngineLabelTiKV.
EngineLabelTiKV = "tikv"
)
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