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namespace_checker.go
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/
namespace_checker.go
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// Copyright 2017 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 schedule
import (
"github.com/pingcap/kvproto/pkg/metapb"
log "github.com/pingcap/log"
"github.com/pingcap/pd/server/core"
"github.com/pingcap/pd/server/namespace"
"go.uber.org/zap"
)
// NamespaceChecker ensures region to go to the right place.
type NamespaceChecker struct {
cluster Cluster
filters []Filter
classifier namespace.Classifier
}
// NewNamespaceChecker creates a namespace checker.
func NewNamespaceChecker(cluster Cluster, classifier namespace.Classifier) *NamespaceChecker {
filters := []Filter{StoreStateFilter{MoveRegion: true}}
return &NamespaceChecker{
cluster: cluster,
filters: filters,
classifier: classifier,
}
}
// Check verifies a region's namespace, creating an Operator if need.
func (n *NamespaceChecker) Check(region *core.RegionInfo) *Operator {
if !n.cluster.IsNamespaceRelocationEnabled() {
return nil
}
checkerCounter.WithLabelValues("namespace_checker", "check").Inc()
// fail-fast if there is only ONE namespace
if n.classifier == nil || len(n.classifier.GetAllNamespaces()) == 1 {
checkerCounter.WithLabelValues("namespace_checker", "no_namespace").Inc()
return nil
}
// get all the stores belong to the namespace
targetStores := n.getNamespaceStores(region)
if len(targetStores) == 0 {
checkerCounter.WithLabelValues("namespace_checker", "no_target_store").Inc()
return nil
}
for _, peer := range region.GetPeers() {
// check whether the peer has been already located on a store that is belong to the target namespace
if n.isExists(targetStores, peer.StoreId) {
continue
}
log.Debug("peer is not located in namespace target stores", zap.Uint64("region-id", region.GetID()), zap.Reflect("peer", peer))
newPeer := n.SelectBestPeerToRelocate(region, targetStores)
if newPeer == nil {
checkerCounter.WithLabelValues("namespace_checker", "no_target_peer").Inc()
return nil
}
op, err := CreateMovePeerOperator("makeNamespaceRelocation", n.cluster, region, OpReplica, peer.GetStoreId(), newPeer.GetStoreId(), newPeer.GetId())
if err != nil {
checkerCounter.WithLabelValues("namespace_checker", "create_operator_fail").Inc()
return nil
}
checkerCounter.WithLabelValues("namespace_checker", "new_operator").Inc()
return op
}
checkerCounter.WithLabelValues("namespace_checker", "all_right").Inc()
return nil
}
// SelectBestPeerToRelocate return a new peer that to be used to move a region
func (n *NamespaceChecker) SelectBestPeerToRelocate(region *core.RegionInfo, targets []*core.StoreInfo) *metapb.Peer {
storeID := n.SelectBestStoreToRelocate(region, targets)
if storeID == 0 {
log.Debug("has no best store to relocate", zap.Uint64("region-id", region.GetID()))
return nil
}
newPeer, err := n.cluster.AllocPeer(storeID)
if err != nil {
return nil
}
return newPeer
}
// SelectBestStoreToRelocate randomly returns the store to relocate
func (n *NamespaceChecker) SelectBestStoreToRelocate(region *core.RegionInfo, targets []*core.StoreInfo) uint64 {
selector := NewRandomSelector(n.filters)
target := selector.SelectTarget(n.cluster, targets, NewExcludedFilter(nil, region.GetStoreIds()))
if target == nil {
return 0
}
return target.GetId()
}
func (n *NamespaceChecker) isExists(stores []*core.StoreInfo, storeID uint64) bool {
for _, store := range stores {
if store.Id == storeID {
return true
}
}
return false
}
func (n *NamespaceChecker) getNamespaceStores(region *core.RegionInfo) []*core.StoreInfo {
ns := n.classifier.GetRegionNamespace(region)
filteredStores := n.filter(n.cluster.GetStores(), NewNamespaceFilter(n.classifier, ns))
return filteredStores
}
func (n *NamespaceChecker) filter(stores []*core.StoreInfo, filters ...Filter) []*core.StoreInfo {
result := make([]*core.StoreInfo, 0)
for _, store := range stores {
if FilterTarget(n.cluster, store, filters) {
continue
}
result = append(result, store)
}
return result
}