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diagnose.go
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diagnose.go
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// Copyright 2018 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 api
import (
"context"
"fmt"
"github.com/juju/errors"
"github.com/pingcap/kvproto/pkg/pdpb"
"github.com/pingcap/pd/server"
"github.com/unrolled/render"
"net/http"
"time"
)
type diagnoseType int
// Recommendation contains a potential problem and possible way to deal with it.
type Recommendation struct {
Module string `json:"module"`
Level string `json:"level"`
Description string `json:"description"`
Instruction string `json:"instruction"`
}
const (
// analyze levels
levelNormal = "Normal"
levelWarning = "Warning"
levelMinor = "Minor"
levelMajor = "Major"
levelCritical = "Critical"
levelFatal = "Fatal"
// analyze modules
modMember = "member"
modTiKV = "TiKV"
modReplica = "Replic"
modSchedule = "Schedule"
modDefault = "Default"
memberOneInstance diagnoseType = iota
memberEvenInstance
memberLostPeers
memberLostPeersMoreThanHalf
memberLeaderChanged
tikvCap70
tikvCap80
tikvCap90
tikvLostPeers
tikvLostPeersLongTime
)
var (
diagnoseMap = map[diagnoseType]Recommendation{
memberOneInstance: {modMember, levelWarning, "only one PD instance is running.", "please add PD instance."},
memberEvenInstance: {modMember, levelMinor, "PD instances is even number.", "the recommended number of PD's instances is odd."},
memberLostPeers: {modMember, levelMajor, "some PD instances is down.", "please check host load and traffic."},
memberLostPeersMoreThanHalf: {modMember, levelCritical, "more than half PD instances is down.", "please check host load and traffic."},
memberLeaderChanged: {modMember, levelMinor, "PD cluster leader is changed.", "please check host load and traffic."},
tikvCap70: {modTiKV, levelWarning, "some TiKV stroage used more than 70%.", "plase add TiKV node."},
tikvCap80: {modTiKV, levelMinor, "some TiKV stroage used more than 80%.", "plase add TiKV node."},
tikvCap90: {modTiKV, levelMajor, "some TiKV stroage used more than 90%.", "plase add TiKV node."},
tikvLostPeers: {modTiKV, levelWarning, "some TiKV lost connect.", "plase check network."},
tikvLostPeersLongTime: {modTiKV, levelMajor, "some TiKV lost connect more than 1h.", "plase check network."},
}
)
type diagnoseHandler struct {
svr *server.Server
rd *render.Render
}
func newDiagnoseHandler(svr *server.Server, rd *render.Render) *diagnoseHandler {
return &diagnoseHandler{
svr: svr,
rd: rd,
}
}
func diagnosePD(key diagnoseType, descAdd, instAdd string) *Recommendation {
d, ok := diagnoseMap[key]
if !ok {
return &Recommendation{
Module: modDefault,
Description: descAdd,
Instruction: instAdd,
}
}
if descAdd != "" {
d.Description = fmt.Sprintf("%s %s", d.Description, descAdd)
}
if instAdd != "" {
d.Instruction = fmt.Sprintf("%s %s", d.Instruction, instAdd)
}
return &d
}
func (d *diagnoseHandler) membersDiagnose(rdd *[]*Recommendation) error {
var lostMemberIDs, runningMemberIDs []uint64
var newLeaderID uint64
req := &pdpb.GetMembersRequest{Header: &pdpb.RequestHeader{ClusterId: d.svr.ClusterID()}}
members, err := d.svr.GetMembers(context.Background(), req)
if err != nil {
return errors.Trace(err)
}
lenMembers := len(members.Members)
if lenMembers > 0 {
for _, m := range members.Members {
pm, err := getEtcdPeerStats(m.ClientUrls[0])
if err != nil {
// get peer etcd failed
lostMemberIDs = append(lostMemberIDs, m.MemberId)
continue
}
runningMemberIDs = append(runningMemberIDs, m.MemberId)
if time.Since(pm.LeaderInfo.StartTime) < time.Duration(time.Minute) {
newLeaderID = m.MemberId
}
}
} else {
return errors.Errorf("get PD member error")
}
lenLostMembers := len(lostMemberIDs)
if newLeaderID != 0 {
*rdd = append(*rdd, diagnosePD(memberLeaderChanged, fmt.Sprintf("new leader %d", newLeaderID), ""))
}
if len(runningMemberIDs) == 1 {
// only one pd peer running
*rdd = append(*rdd, diagnosePD(memberOneInstance, fmt.Sprintf("running PD member ID %d", runningMemberIDs[0]), ""))
}
if lenLostMembers > 0 {
// some pd's peers can not be connected
stringID := "lost members ID "
for _, m := range lostMemberIDs {
stringID = fmt.Sprintf("%s %d,", stringID, m)
}
*rdd = append(*rdd, diagnosePD(memberLostPeers, stringID, ""))
}
if len(runningMemberIDs)%2 == 0 {
// alived pd's numbers is even
*rdd = append(*rdd, diagnosePD(memberEvenInstance, "", ""))
}
if float64(lenMembers)/2 < float64(lenLostMembers) {
*rdd = append(*rdd, diagnosePD(memberLostPeersMoreThanHalf, "", ""))
}
return nil
}
func (d *diagnoseHandler) tikvDiagnose(rdd *[]*Recommendation) error {
return nil
}
func (d *diagnoseHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
rdd := []*Recommendation{}
if err := d.membersDiagnose(&rdd); err != nil {
d.rd.JSON(w, http.StatusInternalServerError, err.Error())
return
}
d.rd.JSON(w, http.StatusOK, rdd)
}