搭建 MongoDB分片（sharding） / 分区 / 集群环境教程

2018-02-0304:48:11数据库教程Comments2,909 views字数 10834阅读模式

1. 安装 MongoDB

三台机器文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

关闭防火墙文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

systemctl stop firewalld.service
192.168.252.121192.168.252.122192.168.252.123
mongosmongosmongos
config serverconfig serverconfig server
shard server1 主节点shard server1 副节点shard server1 仲裁
shard server2 仲裁shard server2 主节点shard server2 副节点
shard server3 副节点shard server3 仲裁shard server3 主节点

端口分配：文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongos：20000
config：21000
shard1：27001
shard2：27002
shard3：27003

下载并且安装文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-amazon-3.6.2.tgz
tar -xzvf mongodb-linux-x86_64-amazon-3.6.2.tgz  -C /usr/local/

所有版本二进制文件,自行下载文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

https://www.mongodb.org/dl/win32/x86_64-2008plus-ssl?_ga=2.87139544.1567998244.1517190032-1153843332.1517190032&_gac=1.204211492.1517212002.EAIaIQobChMI44v9_9b82AIV1AcqCh0lcABIEAAYASAAEgKI1_D_BwE

改名文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

cd /usr/local/
mv  mongodb-linux-x86_64-amazon-3.6.2 mongodb

分别在每台机器建立conf、mongos、config、shard1、shard2、shard3六个目录，因为mongos不存储数据，只需要建立日志文件目录即可。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mkdir -p /usr/local/mongodb/conf \
mkdir -p /usr/local/mongodb/mongos/log \
mkdir -p /usr/local/mongodb/config/data \
mkdir -p /usr/local/mongodb/config/log \
mkdir -p /usr/local/mongodb/shard1/data \
mkdir -p /usr/local/mongodb/shard1/log \
mkdir -p /usr/local/mongodb/shard2/data \
mkdir -p /usr/local/mongodb/shard2/log \
mkdir -p /usr/local/mongodb/shard3/data \
mkdir -p /usr/local/mongodb/shard3/log

配置环境变量文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

vi /etc/profile
# MongoDB 环境变量内容
export MONGODB_HOME=/usr/local/mongodb
export PATH=$MONGODB_HOME/bin:$PATH

使立即生效文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

source /etc/profile

2. config server配置服务器

mongodb3.4以后要求配置服务器也创建副本集，不然集群搭建不成功。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

(三台机器)添加配置文件文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

vi /usr/local/mongodb/conf/config.conf

## 配置文件内容
pidfilepath = /usr/local/mongodb/config/log/configsrv.pid
dbpath = /usr/local/mongodb/config/data
logpath = /usr/local/mongodb/config/log/congigsrv.log
logappend = true
 
bind_ip = 0.0.0.0
port = 21000
fork = true
 
#declare this is a config db of a cluster;
configsvr = true

#副本集名称
replSet = configs
 
#设置最大连接数
maxConns = 20000

启动三台服务器的config server文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongod -f /usr/local/mongodb/conf/config.conf

登录任意一台配置服务器，初始化配置副本集文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

连接 MongoDB文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongo --port 21000

config 变量文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

config = {
	_id : "configs",
	members : [
	{_id : 0, host : "192.168.252.121:21000" },
	{_id : 1, host : "192.168.252.122:21000" },
	{_id : 2, host : "192.168.252.123:21000" }
	]
}

初始化副本集文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

rs.initiate(config)

其中，"_id" : "configs"应与配置文件中配置的 replicaction.replSetName 一致，"members" 中的 "host" 为三个节点的 ip 和 port文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

响应内容如下文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

> config = {
... _id : "configs",
... members : [
... {_id : 0, host : "192.168.252.121:21000" },
... {_id : 1, host : "192.168.252.122:21000" },
... {_id : 2, host : "192.168.252.123:21000" }
... ]
... }
{
	"_id" : "configs",
	"members" : [
		{
			"_id" : 0,
			"host" : "192.168.252.121:21000"
		},
		{
			"_id" : 1,
			"host" : "192.168.252.122:21000"
		},
		{
			"_id" : 2,
			"host" : "192.168.252.123:21000"
		}
	]
}
> rs.initiate(config);
{
	"ok" : 1,
	"operationTime" : Timestamp(1517369899, 1),
	"$gleStats" : {
		"lastOpTime" : Timestamp(1517369899, 1),
		"electionId" : ObjectId("000000000000000000000000")
	},
	"$clusterTime" : {
		"clusterTime" : Timestamp(1517369899, 1),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	}
}
configs:SECONDARY>

此时会发现终端上的输出已经有了变化。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

//从单个一个
>
//变成了
configs:SECONDARY>

查询状态文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

configs:SECONDARY> rs.status()

3. 配置分片副本集

3.1 设置第一个分片副本集

(三台机器)设置第一个分片副本集文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

配置文件文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

vi /usr/local/mongodb/conf/shard1.conf

#配置文件内容
#——————————————–
pidfilepath = /usr/local/mongodb/shard1/log/shard1.pid
dbpath = /usr/local/mongodb/shard1/data
logpath = /usr/local/mongodb/shard1/log/shard1.log
logappend = true

bind_ip = 0.0.0.0
port = 27001
fork = true
 
#副本集名称
replSet = shard1
 
#declare this is a shard db of a cluster;
shardsvr = true
 
#设置最大连接数
maxConns = 20000

启动三台服务器的shard1 server文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongod -f /usr/local/mongodb/conf/shard1.conf

登陆任意一台服务器，初始化副本集(除了192.168.252.123)文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

连接 MongoDB文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongo --port 27001

使用admin数据库文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

use admin

定义副本集配置文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

config = {
    _id : "shard1",
     members : [
         {_id : 0, host : "192.168.252.121:27001" },
         {_id : 1, host : "192.168.252.122:27001" },
         {_id : 2, host : "192.168.252.123:27001" , arbiterOnly: true }
     ]
 }

初始化副本集配置文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

rs.initiate(config)

响应内容如下文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

> use admin
switched to db admin
> config = {
...     _id : "shard1",
...      members : [
...          {_id : 0, host : "192.168.252.121:27001" },
...          {_id : 1, host : "192.168.252.122:27001" },
...          {_id : 2, host : "192.168.252.123:27001" , arbiterOnly: true }
...      ]
...  }
{
	"_id" : "shard1",
	"members" : [
		{
			"_id" : 0,
			"host" : "192.168.252.121:27001"
		},
		{
			"_id" : 1,
			"host" : "192.168.252.122:27001"
		},
		{
			"_id" : 2,
			"host" : "192.168.252.123:27001",
			"arbiterOnly" : true
		}
	]
}
> rs.initiate(config)
{ "ok" : 1 }

此时会发现终端上的输出已经有了变化。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

//从单个一个
>
//变成了
shard1:SECONDARY>

查询状态文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

shard1:SECONDARY> rs.status()

3.2 设置第二个分片副本集

设置第二个分片副本集文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

配置文件文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

vi /usr/local/mongodb/conf/shard2.conf

#配置文件内容
#——————————————–
pidfilepath = /usr/local/mongodb/shard2/log/shard2.pid
dbpath = /usr/local/mongodb/shard2/data
logpath = /usr/local/mongodb/shard2/log/shard2.log
logappend = true

bind_ip = 0.0.0.0
port = 27002
fork = true
 
#副本集名称
replSet=shard2
 
#declare this is a shard db of a cluster;
shardsvr = true
 
#设置最大连接数
maxConns=20000

启动三台服务器的shard2 server文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongod -f /usr/local/mongodb/conf/shard2.conf

连接 MongoDB文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongo --port 27002

使用admin数据库文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

use admin

定义副本集配置文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

config = {
    _id : "shard2",
     members : [
         {_id : 0, host : "192.168.252.121:27002"  , arbiterOnly: true },
         {_id : 1, host : "192.168.252.122:27002" },
         {_id : 2, host : "192.168.252.123:27002" }
     ]
 }

初始化副本集配置文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

rs.initiate(config)

响应内容如下文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

> use admin
switched to db admin
> config = {
...     _id : "shard2",
...      members : [
...          {_id : 0, host : "192.168.252.121:27002"  , arbiterOnly: true },
...          {_id : 1, host : "192.168.252.122:27002" },
...          {_id : 2, host : "192.168.252.123:27002" }
...      ]
...  }
{
	"_id" : "shard2",
	"members" : [
		{
			"_id" : 0,
			"host" : "192.168.252.121:27002",
			"arbiterOnly" : true
		},
		{
			"_id" : 1,
			"host" : "192.168.252.122:27002"
		},
		{
			"_id" : 2,
			"host" : "192.168.252.123:27002"
		}
	]
}
> rs.initiate(config)
{ "ok" : 1 }
shard2:SECONDARY> rs.status()

3.3 设置第三个分片副本集

vi /usr/local/mongodb/conf/shard3.conf

#配置文件内容
#——————————————–
pidfilepath = /usr/local/mongodb/shard3/log/shard3.pid
dbpath = /usr/local/mongodb/shard3/data
logpath = /usr/local/mongodb/shard3/log/shard3.log
logappend = true

bind_ip = 0.0.0.0
port = 27003
fork = true

#副本集名称
replSet=shard3
 
#declare this is a shard db of a cluster;
shardsvr = true
 
#设置最大连接数
maxConns=20000

启动三台服务器的shard3 server文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongod -f /usr/local/mongodb/conf/shard3.conf

登陆任意一台服务器，初始化副本集(除了192.168.252.121)文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongo --port 27003

使用admin数据库文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

use admin

定义副本集配置文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

config = {
    _id : "shard3",
     members : [
         {_id : 0, host : "192.168.252.121:27003" },
         {_id : 1, host : "192.168.252.122:27003" , arbiterOnly: true},
         {_id : 2, host : "192.168.252.123:27003" }
     ]
 }

初始化副本集配置文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

rs.initiate(config)

响应内容如下文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

> use admin
switched to db admin
> config = {
...     _id : "shard3",
...      members : [
...          {_id : 0, host : "192.168.252.121:27003" },
...          {_id : 1, host : "192.168.252.122:27003" , arbiterOnly: true},
...          {_id : 2, host : "192.168.252.123:27003" }
...      ]
...  }
{
	"_id" : "shard3",
	"members" : [
		{
			"_id" : 0,
			"host" : "192.168.252.121:27003"
		},
		{
			"_id" : 1,
			"host" : "192.168.252.122:27003",
			"arbiterOnly" : true
		},
		{
			"_id" : 2,
			"host" : "192.168.252.123:27003"
		}
	]
}
> rs.initiate(config)
{ "ok" : 1 }
shard3:SECONDARY> rs.status()

3.4 配置路由服务器 mongos

（三台机器）先启动配置服务器和分片服务器,后启动路由实例启动路由实例:文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

vi /usr/local/mongodb/conf/mongos.conf

#内容
pidfilepath = /usr/local/mongodb/mongos/log/mongos.pid
logpath = /usr/local/mongodb/mongos/log/mongos.log
logappend = true

bind_ip = 0.0.0.0
port = 20000
fork = true

#监听的配置服务器,只能有1个或者3个 configs为配置服务器的副本集名字
configdb = configs/192.168.252.121:21000,192.168.252.122:21000,192.168.252.123:21000
 
#设置最大连接数
maxConns = 20000

启动三台服务器的mongos server文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongos -f /usr/local/mongodb/conf/mongos.conf

4. 串联路由服务器

目前搭建了mongodb配置服务器、路由服务器，各个分片服务器，不过应用程序连接到mongos路由服务器并不能使用分片机制，还需要在程序里设置分片配置，让分片生效。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

登陆任意一台mongos文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongo --port 20000

使用admin数据库文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

use  admin

串联路由服务器与分配副本集文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

sh.addShard("shard1/192.168.252.121:27001,192.168.252.122:27001,192.168.252.123:27001");
sh.addShard("shard2/192.168.252.121:27002,192.168.252.122:27002,192.168.252.123:27002");
sh.addShard("shard3/192.168.252.121:27003,192.168.252.122:27003,192.168.252.123:27003");

查看集群状态文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

sh.status()

响应内容如下文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongos> sh.status()
--- Sharding Status --- 
  sharding version: {
  	"_id" : 1,
  	"minCompatibleVersion" : 5,
  	"currentVersion" : 6,
  	"clusterId" : ObjectId("5a713a37d56e076f3eb47acf")
  }
  shards:
        {  "_id" : "shard1",  "host" : "shard1/192.168.252.121:27001,192.168.252.122:27001",  "state" : 1 }
        {  "_id" : "shard2",  "host" : "shard2/192.168.252.122:27002,192.168.252.123:27002",  "state" : 1 }
        {  "_id" : "shard3",  "host" : "shard3/192.168.252.121:27003,192.168.252.123:27003",  "state" : 1 }
  active mongoses:
        "3.6.2" : 3
  autosplit:
        Currently enabled: yes
  balancer:
        Currently enabled:  yes
        Currently running:  no
        Failed balancer rounds in last 5 attempts:  0
        Migration Results for the last 24 hours: 
                No recent migrations
  databases:
        {  "_id" : "config",  "primary" : "config",  "partitioned" : true }

mongos>

5. 启用集合分片生效

目前配置服务、路由服务、分片服务、副本集服务都已经串联起来了，但我们的目的是希望插入数据，数据能够自动分片。连接在mongos上，准备让指定的数据库、指定的集合分片生效。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

登陆任意一台mongos文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongo --port 20000

使用admin数据库文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

use  admin

指定testdb分片生效文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

db.runCommand( { enablesharding :"testdb"});

指定数据库里需要分片的集合和片键，哈希id 分片文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

db.runCommand( { shardcollection : "testdb.table1",key : {"id": "hashed"} } );

我们设置testdb的 table1 表需要分片，根据 id 自动分片到 shard1 ，shard2，shard3 上面去。要这样设置是因为不是所有mongodb 的数据库和表 都需要分片！文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

测试分片配置结果文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

连接 MongoDB 路由服务文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongo  127.0.0.1:20000

切换到 testdb 数据库文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

use  testdb;

插入测试数据文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

for(i=1;i<=100000;i++){db.table1.insert({"id":i,"name":"penglei"})};

总条数文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

db.table1.aggregate([{$group : {_id : "$name", totle : {$sum : 1}}}])

查看分片情况如下文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

  • shard1： "count": 33755
  • shard2： "count": 33143,
  • shard3： "count": 33102

结论数据基本均匀文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

db.table1.stats();

mongos> db.table1.stats();
{
    "sharded": true,
    "capped": false,
    "ns": "testdb.table1",
    "count": 100000,
    "size": 5200000,
    "storageSize": 1519616,
    "totalIndexSize": 3530752,
    "indexSizes": {
        "_id_": 892928,
        "id_hashed": 2637824
    },
    "avgObjSize": 52,
    "nindexes": 2,
    "nchunks": 6,
    "shards": {
        "shard1": {
            "ns": "testdb.table1",
            "size": 1755260,
            "count": 33755,
            "avgObjSize": 52,
            "storageSize": 532480,
            "capped": false,
            "wiredTiger": {
			...省略很多
            }
        },
        "shard2": {
            "ns": "testdb.table1",
            "size": 1723436,
            "count": 33143,
            "avgObjSize": 52,
            "storageSize": 479232,
            "capped": false,
            "wiredTiger": {
			...省略很多
            }
        },
        "shard3": {
            "ns": "testdb.table1",
            "size": 1721304,
            "count": 33102,
            "avgObjSize": 52,
            "storageSize": 507904,
            "capped": false,
            "wiredTiger": {
			...省略很多
            }
        }
    },
    "ok": 1,
    "$clusterTime": {
        "clusterTime": Timestamp(1517488062, 350),
        "signature": {
            "hash": BinData(0, "AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
            "keyId": NumberLong(0)
        }
    },
    "operationTime": Timestamp(1517488062, 350)
}
mongos>

分组查看总数量是：100000文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongos> db.table1.aggregate([{$group : {_id : "$name", totle : {$sum : 1}}}])
{ "_id" : "penglei", "totle" : 100000 }
mongos>

后期运维

参考文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

手把手教你 MongoDB 的安装与详细使用（一）文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

www.ymq.io/2018/01/26/…文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

手把手教你 MongoDB 的安装与详细使用（二）文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

www.ymq.io/2018/01/29/…文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

创建索引文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

db.table1.createIndex({"name":1})
db.table1.getIndexes()

启动文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongodb的启动顺序是，先启动配置服务器，在启动分片，最后启动mongos.文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

mongod -f /usr/local/mongodb/conf/config.conf
mongod -f /usr/local/mongodb/conf/shard1.conf
mongod -f /usr/local/mongodb/conf/shard2.conf
mongod -f /usr/local/mongodb/conf/shard3.conf
mongod -f /usr/local/mongodb/conf/mongos.conf

启动报错文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

about to fork child process, waiting until server is ready for connections.
forked process: 1303
child process started successfully, parent exiting
[root@node1 ~]# mongod -f /usr/local/mongodb/conf/shard1.conf
about to fork child process, waiting until server is ready for connections.
forked process: 1384

删除 mongod.lock文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

cd /usr/local/mongodb/shard1/data
rm -rf mongod.lock

关闭文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

#debian、ubuntu系统下：

apt-get install psmisc

#centos或、rhel系统下：

yum install psmisc

关闭时，直接killall杀掉所有进程文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

killall mongod
killall mongos

参考：文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

Runoob 教程：http://www.runoob.com/mongodb/mongodb-tutorial.html
Tutorials 教程：Pointhttps://www.tutorialspoint.com/mongodb/mongodb_advantages.htm
MongoDB 官网地址：https://www.mongodb.com
MongoDB 官方英文文档：https://docs.mongodb.com/manual
MongoDB 各平台下载地址：https://www.mongodb.com/download-center#community
MongoDB 安装 https://docs.mongodb.com/manual/tutorial/install-mongodb-enterprise-on-ubuntu文章源自菜鸟学院-https://www.cainiaoxueyuan.com/sjk/417.html

Contact

作者：鹏磊
链接：https://juejin.im/post/5a730fae5188257a5f1e95d1
来源：掘金
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