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"
)