forked from tikv/pd
/
namespace_classifier.go
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/
namespace_classifier.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 table
import (
"encoding/json"
"fmt"
"math"
"net/http"
"path"
"regexp"
"sync"
"time"
log "github.com/Sirupsen/logrus"
"github.com/juju/errors"
"github.com/pingcap/pd/server/core"
"github.com/pingcap/pd/server/namespace"
)
// Namespace defines two things:
// 1. relation between a Name and several tables
// 2. relation between a Name and several stores
// It is used to bind tables with stores
type Namespace struct {
ID uint64 `json:"ID"`
Name string `json:"Name"`
TableIDs map[int64]bool `json:"table_ids,omitempty"`
StoreIDs map[uint64]bool `json:"store_ids,omitempty"`
}
// NewNamespace creates a new namespace
func NewNamespace(id uint64, name string) *Namespace {
return &Namespace{
ID: id,
Name: name,
TableIDs: make(map[int64]bool),
StoreIDs: make(map[uint64]bool),
}
}
// GetName returns namespace's Name or default 'global' value
func (ns *Namespace) GetName() string {
if ns != nil {
return ns.Name
}
return namespace.DefaultNamespace
}
// GetID returns namespace's ID or 0
func (ns *Namespace) GetID() uint64 {
if ns != nil {
return ns.ID
}
return 0
}
// AddTableID adds a tableID to this namespace
func (ns *Namespace) AddTableID(tableID int64) {
if ns.TableIDs == nil {
ns.TableIDs = make(map[int64]bool)
}
ns.TableIDs[tableID] = true
}
// AddStoreID adds a storeID to this namespace
func (ns *Namespace) AddStoreID(storeID uint64) {
if ns.StoreIDs == nil {
ns.StoreIDs = make(map[uint64]bool)
}
ns.StoreIDs[storeID] = true
}
// tableNamespaceClassifier implements Classifier interface
type tableNamespaceClassifier struct {
sync.RWMutex
nsInfo *namespacesInfo
tableIDDecoder IDDecoder
kv *core.KV
idAlloc core.IDAllocator
http.Handler
}
const kvRangeLimit = 1000
// NewTableNamespaceClassifier creates a new namespace classifier that
// classifies stores and regions by table range.
func NewTableNamespaceClassifier(kv *core.KV, idAlloc core.IDAllocator) (namespace.Classifier, error) {
nsInfo := newNamespacesInfo()
if err := nsInfo.loadNamespaces(kv, kvRangeLimit); err != nil {
return nil, errors.Trace(err)
}
c := &tableNamespaceClassifier{
nsInfo: nsInfo,
tableIDDecoder: DefaultIDDecoder,
kv: kv,
idAlloc: idAlloc,
}
c.Handler = newTableClassifierHandler(c)
return c, nil
}
func (c *tableNamespaceClassifier) GetAllNamespaces() []string {
c.RLock()
defer c.RUnlock()
nsList := make([]string, 0, len(c.nsInfo.namespaces))
for name := range c.nsInfo.namespaces {
nsList = append(nsList, name)
}
return nsList
}
func (c *tableNamespaceClassifier) GetStoreNamespace(storeInfo *core.StoreInfo) string {
c.RLock()
defer c.RUnlock()
for name, ns := range c.nsInfo.namespaces {
_, ok := ns.StoreIDs[storeInfo.Id]
if ok {
return name
}
}
return namespace.DefaultNamespace
}
func (c *tableNamespaceClassifier) GetRegionNamespace(regionInfo *core.RegionInfo) string {
c.RLock()
defer c.RUnlock()
tableID := c.getTableID(regionInfo)
if tableID == 0 {
return namespace.DefaultNamespace
}
for name, ns := range c.nsInfo.namespaces {
_, ok := ns.TableIDs[tableID]
if ok {
return name
}
}
return namespace.DefaultNamespace
}
// getTableID returns the meaningful tableID (not 0) only if
// the region contains only the contents of that table
// else it returns 0
func (c *tableNamespaceClassifier) getTableID(regionInfo *core.RegionInfo) int64 {
startTableID := c.tableIDDecoder.DecodeTableID(regionInfo.StartKey)
endTableID := c.tableIDDecoder.DecodeTableID(regionInfo.EndKey)
if startTableID == 0 || endTableID == 0 {
log.Debugf("Region %s has StartTableID (%d) or EndTableID (%d) of value 0", *regionInfo, startTableID, endTableID)
}
if startTableID == 0 && endTableID == 0 {
// The startTableID and endTableID cannot be decoded,
// indicating the region contains meta-info
return 0
}
// The [startTableID|endTableID] is 0,
// indicating that the region contains infinite edge
if startTableID == 0 {
return endTableID
}
if endTableID == 0 {
return startTableID
}
if startTableID == endTableID {
return startTableID
}
// The startTableID is not equal to the endTableID for regionInfo,
// so check whether endKey is the startKey of the next table
if (startTableID == endTableID-1) && IsPureTableID(regionInfo.EndKey) {
return startTableID
}
return 0
}
// GetNamespaces returns all namespace details.
func (c *tableNamespaceClassifier) GetNamespaces() []*Namespace {
c.RLock()
defer c.RUnlock()
return c.nsInfo.getNamespaces()
}
// CreateNamespace creates a new Namespace.
func (c *tableNamespaceClassifier) CreateNamespace(name string) error {
c.Lock()
defer c.Unlock()
r := regexp.MustCompile(`^\w+$`)
matched := r.MatchString(name)
if !matched {
return errors.New("Name should be 0-9, a-z or A-Z")
}
if n := c.nsInfo.getNamespaceByName(name); n != nil {
return errors.New("Duplicate namespace Name")
}
id, err := c.idAlloc.Alloc()
if err != nil {
return errors.Trace(err)
}
ns := NewNamespace(id, name)
err = c.putNamespaceLocked(ns)
return errors.Trace(err)
}
// AddNamespaceTableID adds table ID to namespace.
func (c *tableNamespaceClassifier) AddNamespaceTableID(name string, tableID int64) error {
c.Lock()
defer c.Unlock()
n := c.nsInfo.getNamespaceByName(name)
if n == nil {
return errors.Errorf("invalid namespace Name %s, not found", name)
}
if c.nsInfo.IsTableIDExist(tableID) {
return errors.New("Table ID already exists in this cluster")
}
n.AddTableID(tableID)
return c.putNamespaceLocked(n)
}
// RemoveNamespaceTableID removes table ID from namespace.
func (c *tableNamespaceClassifier) RemoveNamespaceTableID(name string, tableID int64) error {
c.Lock()
defer c.Unlock()
n := c.nsInfo.getNamespaceByName(name)
if n == nil {
return errors.Errorf("invalid namespace Name %s, not found", name)
}
if _, ok := n.TableIDs[tableID]; !ok {
return errors.Errorf("Table ID %d is not belong to %s", tableID, name)
}
delete(n.TableIDs, tableID)
return c.putNamespaceLocked(n)
}
// AddNamespaceStoreID adds store ID to namespace.
func (c *tableNamespaceClassifier) AddNamespaceStoreID(name string, storeID uint64) error {
c.Lock()
defer c.Unlock()
n := c.nsInfo.getNamespaceByName(name)
if n == nil {
return errors.Errorf("invalid namespace Name %s, not found", name)
}
if c.nsInfo.IsStoreIDExist(storeID) {
return errors.New("Store ID already exists in this namespace")
}
n.AddStoreID(storeID)
return c.putNamespaceLocked(n)
}
// RemoveNamespaceStoreID removes store ID from namespace.
func (c *tableNamespaceClassifier) RemoveNamespaceStoreID(name string, storeID uint64) error {
c.Lock()
defer c.Unlock()
n := c.nsInfo.getNamespaceByName(name)
if n == nil {
return errors.Errorf("invalid namespace Name %s, not found", name)
}
if _, ok := n.StoreIDs[storeID]; !ok {
return errors.Errorf("Store ID %d is not belong to %s", storeID, name)
}
delete(n.StoreIDs, storeID)
return c.putNamespaceLocked(n)
}
func (c *tableNamespaceClassifier) putNamespaceLocked(ns *Namespace) error {
if c.kv != nil {
if err := c.nsInfo.saveNamespace(c.kv, ns); err != nil {
return errors.Trace(err)
}
}
c.nsInfo.setNamespace(ns)
return nil
}
type namespacesInfo struct {
namespaces map[string]*Namespace
}
func newNamespacesInfo() *namespacesInfo {
return &namespacesInfo{
namespaces: make(map[string]*Namespace),
}
}
func (namespaceInfo *namespacesInfo) getNamespaceByName(name string) *Namespace {
namespace, ok := namespaceInfo.namespaces[name]
if !ok {
return nil
}
return namespace
}
func (namespaceInfo *namespacesInfo) setNamespace(item *Namespace) {
namespaceInfo.namespaces[item.Name] = item
}
func (namespaceInfo *namespacesInfo) getNamespaceCount() int {
return len(namespaceInfo.namespaces)
}
func (namespaceInfo *namespacesInfo) getNamespaces() []*Namespace {
nsList := make([]*Namespace, 0, len(namespaceInfo.namespaces))
for _, item := range namespaceInfo.namespaces {
nsList = append(nsList, item)
}
return nsList
}
// IsTableIDExist returns true if table ID exists in namespacesInfo
func (namespaceInfo *namespacesInfo) IsTableIDExist(tableID int64) bool {
for _, ns := range namespaceInfo.namespaces {
_, ok := ns.TableIDs[tableID]
if ok {
return true
}
}
return false
}
// IsStoreIDExist returns true if store ID exists in namespacesInfo
func (namespaceInfo *namespacesInfo) IsStoreIDExist(storeID uint64) bool {
for _, ns := range namespaceInfo.namespaces {
_, ok := ns.StoreIDs[storeID]
if ok {
return true
}
}
return false
}
func (namespaceInfo *namespacesInfo) namespacePath(nsID uint64) string {
return path.Join("namespace", fmt.Sprintf("%20d", nsID))
}
func (namespaceInfo *namespacesInfo) saveNamespace(kv *core.KV, ns *Namespace) error {
value, err := json.Marshal(ns)
if err != nil {
return errors.Trace(err)
}
err = kv.Save(namespaceInfo.namespacePath(ns.GetID()), string(value))
return errors.Trace(err)
}
func (namespaceInfo *namespacesInfo) loadNamespaces(kv *core.KV, rangeLimit int) error {
start := time.Now()
nextID := uint64(0)
endKey := namespaceInfo.namespacePath(math.MaxUint64)
for {
key := namespaceInfo.namespacePath(nextID)
res, err := kv.LoadRange(key, endKey, rangeLimit)
if err != nil {
return errors.Trace(err)
}
for _, s := range res {
ns := &Namespace{}
if err := json.Unmarshal([]byte(s), ns); err != nil {
return errors.Trace(err)
}
nextID = ns.GetID() + 1
namespaceInfo.setNamespace(ns)
}
if len(res) < rangeLimit {
log.Infof("load %v namespacesInfo cost %v", namespaceInfo.getNamespaceCount(), time.Since(start))
return nil
}
}
}