MongoDBV3.0.7版本(shard+replica)集群的搭建及验证

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篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了MongoDBV3.0.7版本(shard+replica)集群的搭建及验证相关的知识,希望对你有一定的参考价值。

  • 集群的模块介绍:

从MongoDB官方给的集群架构了解,整个集群主要有4个模块:Config Server、mongs、 shard、replica set:
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Config Server:用来存放集群的元数据,也就是存放所有分片的的配置数据,mongos第一次启动就需要连接configServer读取相关数据,当configServer有数据进行更新时,也会主动推送消息到所有的mongos上,在3.0.7版本中,官方是建议配置3份的Config Server,以便挂掉两台时,业务还能够正常运转。
 
mongs:Mongodb集群的的请求入口,能否自动实现数据的分布式分发,生产环境中建议部署在应用服务器上。
 
shard:分片就比如是将一张大表分散在几个不同的shard中,实现数据分布式存储。
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replica set:主要是对每个分片进行冗余,生产环境中,一般将将副本集配置在三个节点上,两份副本、一份仲裁。
 
  • 环境规划:

  • 端口及安装路径规划:

用途 IP 端口 备注 安装路径
ConfigeServer 172.16.16.120 30001   /db/configS
172.16.16.121 30001 /db/configS
172.16.16.122 30001 /db/configS
share1 172.16.16.124 40001 Shard1主节点 /db/shard1
172.16.16.125 40001 Shard1副本节点 /db/shard1
172.16.16.126 40001 Shard1仲裁节点 /db/shard1
share2 172.16.16.125 40002 Shard2主节点 /db/shard2
172.16.16.126 40002 Shard2副本节点 /db/shard2
172.16.16.131 40002 Shard2仲裁节点 /db/shard2
share3 172.16.16.126 40003 Shard3主节点 /db/shard3
172.16.16.131 40003 Shard3副本节点 /db/shard3
172.16.16.124 40003 Shard3仲裁节点 /db/shard3
share4 172.16.16.121 40004 Shard4主节点 /db/shard4
172.16.16.124 40004 Shard4副本节点 /db/shard4
172.16.16.125 40004 Shard4仲裁节点 /db/shard4
mongos 172.16.16.124 50001 生产环境中一般直接部署在应用端 /db/mongos
172.16.16.125 50001 /db/mongos
172.16.16.126 50001 /db/mongos
172.16.16.131 50001 /db/mongos
 
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opt]# tar zxvf mongodb-linux-x86_64-rhel55-3.0.7.gz
opt]# mv mongodb-linux-x86_64-rhel55-3.0.7 /usr/local/mongodb
opt]# useradd  mongo
opt]# passwd  mongo
Changing password for user mongo.
New UNIX password:
BAD PASSWORD: it is too simplistic/systematic
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
opt]# chown -R mongo:mongo /usr/local/mongodb/
opt]# chown -R  mongo:mongo /db
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  • 创建相关模块存放路径:

  • 创建configeServer目录(172.16.16.120/121/122):

#mkdir -p  /db/configS/data & mkdir -p /db/configS/log (存放ConfigServer的数据、日志)
  • 创建shard1目录(172.16.16.124/125/126):

#mkdir -p  /db/shard1/data & mkdir -p /db/shard1/log (存放shard1的数据、日志)
  • 创建shard2目录(172.16.16.125/126/131 ):

#mkdir -p  /db/shard2/data & mkdir -p /db/shard2/log (存放shard2的数据、日志)
  • 创建shard3目录(172.16.16.126/131/124 ):

#mkdir -p  /db/shard3/data & mkdir -p /db/shard3/log (存放shard3的数据、日志)
  • 创建shard4目录(172.16.16.131/124/125 ):

#mkdir -p  /db/shard4/data & mkdir -p /db/shard4/log (存放shard4的数据、日志)
  • 创建mongos目录(172.16.16.124/125/126/131)

#mkdir -p  /db/mongos/log (由于mongos只做路由使用,不存数据,所以只需要建立log目录)
  •  模块配置及启动:

  • configServer(172.16.16.120/121/122)配置及服务启动:

编写 /usr/local/mongodb/conf/configServer.conf,将参数都放在该文件中:
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#vim /usr/local/mongodb/conf/configServer.conf
#!/bin/bash
systemLog:
   destination: file
   path: "/db/configS/log/configServer.log"                                #日志存储位置
   logAppend: true
storage:
   journal:                                                                #journal配置
      enabled: true
   dbPath: "/db/configS/data"                                              #数据文件存储位置
   directoryPerDB: true                                                    #是否一个库一个文件夹    
   engine: wiredTiger                                                      #数据引擎   
   wiredTiger:                                                             #WT引擎配置
      engineConfig:
         cacheSizeGB: 6                                                    #设置为6G,默认为物理内存的一半
         directoryForIndexes: true                                         #是否将索引也按数据库名单独存储
         journalCompressor: zlib
      collectionConfig:                                                    #表压缩配置
         blockCompressor: zlib
      indexConfig:                                                         #索引配置
         prefixCompression: true
net:                                                                       #端口配置
   port: 30001                                                             #另外两台需要分别修改为30002、30003
processManagement:                                                         #配置启动管理方式
   fork: true
sharding:                                                                  #分片配置
   clusterRole: configsvr                                                  #分片角色
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启动configServer:
conf]$ /usr/local/mongodb/bin/mongod -f /usr/local/mongodb/conf/configServer.conf
  • mongos(172.16.16.124/125/126/131)配置及服务启动:

编写mongos.conf,将参数都放在该文件中(4台配置文件都一样):
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#vim /usr/local/mongodb/conf/mongos.conf
#!/bin/bash
systemLog:
    destination: file
    path: "/db/mongos/log/mongos.log"
    logAppend: true
net:
    port: 50001
sharding:
    configDB: 172.16.16.120:30001,172.16.16.121:30001,172.16.16.122:30001
processManagement:
    fork: true
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启动mongos:应保证集群中设备的时间都是一样的,否则启动mongos会报错,若不相同,可先搭建一套NTP服务器
conf]$ /usr/local/mongodb/bin/mongos -f /usr/local/mongodb/conf/mongos.conf
  • shard1分片+副本集配置及服务启动(172.16.16.124/125/126 ):

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#vim /usr/local/mongodb/conf/shard1.conf
#!/bin/bash
systemLog:
   destination: file                                                                     
   path: "/db/shard1/log/shard1.log"                                #日志存储位置
   logAppend: true
storage:                                                                                   
   journal:                                                         #journal配置
      enabled: true
   dbPath: "/db/shard1/data"                                        #数据文件存储位置
   directoryPerDB: true                                             #是否一个库一个文件夹    
   engine: wiredTiger                                               #数据引擎   
   wiredTiger:                                                      #WT引擎配置
      engineConfig:
         cacheSizeGB: 6                                             #设置为6G,默认为物理内存的一半
         directoryForIndexes: true                                  #是否将索引也按数据库名单独存储
         journalCompressor: zlib
      collectionConfig:                                             #表压缩配置
         blockCompressor: zlib
      indexConfig:                                                  #索引配置
         prefixCompression: true
net:                                                                #端口配置
   port: 40001
processManagement:                                                  #配置启动管理方式
   fork: true
sharding:                                                           #分片配置
   clusterRole: shardsvr
replication:                                                        
   replSetName: shard1                                              #配置副本集名称
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启动shard1 mongod:
conf]$ /usr/local/mongodb/bin/mongod -f /usr/local/mongodb/conf/shard1.conf
  •  shard2分片+副本集配置及服务启动(172.16.16.125/126/131 ):

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#vim /usr/local/mongodb/conf/shard2.conf
#!/bin/bash
systemLog:
   destination: file                                                                     
   path: "/db/shard2/log/shard2.log"                                #日志存储位置
   logAppend: true
storage:                                                                                   
   journal:                                                         #journal配置
      enabled: true
   dbPath: "/db/shard2/data"                                        #数据文件存储位置
   directoryPerDB: true                                             #是否一个库一个文件夹    
   engine: wiredTiger                                               #数据引擎   
   wiredTiger:                                                      #WT引擎配置
      engineConfig:
         cacheSizeGB: 6                                             #设置为6G,默认为物理内存的一半
         directoryForIndexes: true                                  #是否将索引也按数据库名单独存储
         journalCompressor: zlib
      collectionConfig:                                             #表压缩配置
         blockCompressor: zlib
      indexConfig:                                                  #索引配置
         prefixCompression: true
net:                                                                #端口配置
   port: 40002
processManagement:                                                  #配置启动管理方式
   fork: true
sharding:                                                           #分片配置
   clusterRole: shardsvr
replication:                                                       
   #oplogSizeMB: 
   replSetName: shard2                                              #配置副本集名称
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启动shard2 mongod:

conf]$ /usr/local/mongodb/bin/mongod -f /usr/local/mongodb/conf/shard2.conf
  • shard3分片+副本集配置及服务启动(172.16.16.126/131/124 ):

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#vim /usr/local/mongodb/conf/shard3.conf
#!/bin/bash
systemLog:
   destination: file                                                                     
   path: "/db/shard3/log/shard3.log"                                #日志存储位置
   logAppend: true
storage:                                                                                   
   journal:                                                         #journal配置
      enabled: true
   dbPath: "/db/shard3/data"                                        #数据文件存储位置
   directoryPerDB: true                                             #是否一个库一个文件夹    
   engine: wiredTiger                                               #数据引擎   
   wiredTiger:                                                      #WT引擎配置
      engineConfig:
         cacheSizeGB: 6                                             #设置为6G,默认为物理内存的一半
         directoryForIndexes: true                                  #是否将索引也按数据库名单独存储
         journalCompressor: zlib
      collectionConfig:                                             #表压缩配置
         blockCompressor: zlib
      indexConfig:                                                  #索引配置
         prefixCompression: true
net:                                                                #端口配置
   port: 40003
processManagement:                                                  #配置启动管理方式
   fork: true
sharding:                                                           #分片配置
   clusterRole: shardsvr
replication:                                                              
   #oplogSizeMB: 
   replSetName: shard3                                              #配置副本集名称
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启动shara3 mongod:
conf]$ /usr/local/mongodb/bin/mongod -f /usr/local/mongodb/conf/shard3.conf
  • shard4分片+副本集配置及服务启动(172.16.16.131/124/125 ):

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#vim /usr/local/mongodb/conf/shard4.conf
#!/bin/bash
systemLog:
   destination: file                                                                     
   path: "/db/shard4/log/shard4.log"                                #日志存储位置
   logAppend: true
storage:                                                                                   
   journal:                                                         #journal配置
      enabled: true
   dbPath: "/db/shard4/data"                                        #数据文件存储位置
   directoryPerDB: true                                             #是否一个库一个文件夹    
   engine: wiredTiger                                               #数据引擎   
   wiredTiger:                                                      #WT引擎配置
      engineConfig:
         cacheSizeGB: 6                                             #设置为6G,默认为物理内存的一半
         directoryForIndexes: true                                  #是否将索引也按数据库名单独存储
         journalCompressor: zlib
      collectionConfig:                                             #表压缩配置
         blockCompressor: zlib
      indexConfig:                                                  #索引配置
         prefixCompression: true
net:                                                                #端口配置
   port: 40004
processManagement:                                                  #配置启动管理方式
   fork: true
sharding:                                                           #分片配置
   clusterRole: shardsvr
replication:                                                          
   #oplogSizeMB: 
   replSetName: shard4                                              #复制集名
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启动shara4 mongod:
conf]$ /usr/local/mongodb/bin/mongod -f /usr/local/mongodb/conf/shard4.conf
  •  集群配置:

  • 副本集配置(在每个 shard的主节点上进行配置及初始化,否则会初始化失败 ):

  • shard1的副本集配置(主节点、副本节点、仲裁节点):

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bin]$ ./mongo 172.16.16.124:40001
MongoDB shell version: 3.0.7
connecting to: 172.16.16.124:40001/test
> use admin
switched to db admin
> config = { _id:"shard1", members:[
                 {_id:0,host:"172.16.16.124:40001"},
                 {_id:1,host:"172.16.16.125:40001"},
                 {_id:2,host:"172.16.16.126:40001",arbiterOnly:true}]
        }

#以下为输出
{
        "_id" : "shard1",
        "members" : [
                {
                        "_id" : 0,
                        "host" : "172.16.16.124:40001"
                },
                {
                        "_id" : 1,
                        "host" : "172.16.16.125:40001"
                },
                {
                        "_id" : 2,
                        "host" : "172.16.16.126:40001",
                        "arbiterOnly" : true
                }
        ]
}
> rs.initiate(config);  #初始化配置
{ "ok" : 1 } 
 
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  • shard2的副本集配置(主节点、副本节点、仲裁节点):

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bin]$ ./mongo 172.16.16.125:40002
MongoDB shell version: 3.0.7
connecting to: 172.16.16.125:40002/test
> use admin
switched to db admin
> config = { _id:"shard2", members:[
                     {_id:0,host:"172.16.16.125:40002"},
                    {_id:1,host:"172.16.16.126:40002"},
                   {_id:2,host:"172.16.16.131:40002",arbiterOnly:true}]
         }
 
#以下为输出
{
        "_id" : "shard2",
        "members" : [
                {
                        "_id" : 0,
                        "host" : "172.16.16.125:40002"
                },
                {
                        "_id" : 1,
                        "host" : "172.16.16.126:40002"
                },
                {
                        "_id" : 2,
                        "host" : "172.16.16.131:40002",
                        "arbiterOnly" : true
                }
        ]
}
> rs.initiate(config);  #初始化配置  
{ "ok" : 1 }
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  • shard3的副本集配置(主节点、副本节点、仲裁节点):

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bin]$ ./mongo 172.16.16.126:40003
MongoDB shell version: 3.0.7
connecting to: 172.16.16.126:40003/test
> use admin
switched to db admin
> config = { _id:"shard3", members:[
                    {_id:0,host:"172.16.16.126:40003"},
                     {_id:1,host:"172.16.16.131:40003"},
                    {_id:2,host:"172.16.16.124:40003",arbiterOnly:true}]
          }
 
#以下为输出
{
        "_id" : "shard3",
        "members" : [
                {
                        "_id" : 0,
                        "host" : "172.16.16.126:40003"
                },
                {
                        "_id" : 1,
                        "host" : "172.16.16.131:40003"
                },
                {
                        "_id" : 2,
                        "host" : "172.16.16.124:40003",
                        "arbiterOnly" : true
                }
        ]
}
> rs.initiate(config);  #初始化配置
{ "ok" : 1 }
 
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  •  shard4的副本集配置(主节点、副本节点、仲裁节点):

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bin]$ ./mongo 172.16.16.131:40004
MongoDB shell version: 3.0.7
connecting to: 172.16.16.131:40004/test
> use admin
switched to db admin
> config = { _id:"shard4", members:[
                    {_id:0,host:"172.16.16.131:40004"},
                     {_id:1,host:"172.16.16.124:40004"},
                    {_id:2,host:"172.16.16.125:40004",arbiterOnly:true}]
          }
 
#以下为输出
{
        "_id" : "shard4",
        "members" : [
                {
                        "_id" : 0,
                        "host" : "172.16.16.131:40004"
                },
                {
                        "_id" : 1,
                        "host" : "172.16.16.124:40004"
                },
                {
                        "_id" : 2,
                        "host" : "172.16.16.125:40004",
                        "arbiterOnly" : true
                }
        ]
}
> rs.initiate(config);  #初始化配置
{ "ok" : 1 }
 
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  • 分片配置

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bin]$ ./mongo 172.16.16.124:50001
mongos> use admin
switched to db admin
mongos> db.runCommand({addshard:"shard1/172.16.16.124:40001,172.16.16.125:40001,172.16.16.126:40001"});
{ "shardAdded" : "shard1", "ok" : 1 }
 
mongos>db.runCommand({addshard:"shard2/172.16.16.125:40002,172.16.16.126:40002,172.16.16.131:40002"});
{ "shardAdded" : "shard2", "ok" : 1 }
 
mongos>db.runCommand({addshard:"shard3/172.16.16.126:40003,172.16.16.131:40003,172.16.16.124:40003"});
{ "shardAdded" : "shard3", "ok" : 1 }
 
mongos>db.runCommand({addshard:"shard4/172.16.16.131:40004,172.16.16.124:40004,172.16.16.125:40004"});
{ "shardAdded" : "shard4", "ok" : 1 }
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  • 查看配置是否生效(仲裁不被列出 )

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mongos> db.runCommand( { listshards : 1 } );
{
        "shards" : [
                {
                        "_id" : "shard1",
                        "host" : "shard1/172.16.16.124:40001,172.16.16.125:40001"
                },
                {
                        "_id" : "shard2",
                        "host" : "shard2/172.16.16.125:40002,172.16.16.126:40002"
                },
                {
                        "_id" : "shard3",
                        "host" : "shard3/172.16.16.126:40003,172.16.16.131:40003"
                },
                {
                        "_id" : "shard4",
                        "host" : "shard4/172.16.16.124:40004,172.16.16.131:40004"
                }
        ],
        "ok" : 1
}
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以上就完成了MongoDB shard+replica模式的集群搭建,接下来做业务测试。
 
  • 集群测试

默认情况下,库和集合没有自动分片的,若有数据写入,只会往一个shard中存储,做个测试验证:
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bin]$ ./mongo 172.16.16.131:50001
MongoDB shell version: 3.0.7
connecting to: 172.16.16.131:50001/test
mongos> use ljaidb
switched to db ljaidb
mongos> for (var i=1;i<=10000;i++) db.ljaitable.save({"name":"ljai","age":27,"addr":"fuzhou"})
WriteResult({ "nInserted" : 1 })
mongos> db.ljaitable.stats()
{
        "sharded" : false,
        "primary" : "shard1",
        "ns" : "ljaidb.ljaitable",
        "count" : 10000,
        "size" : 670000,
        "avgObjSize" : 67,
        "storageSize" : 49152,
        "capped" : false,
        "wiredTiger" : {
                "metadata" : {
                        "formatVersion" : 1
                }
mongos> db.printShardingStatus()
--- Sharding Status ---
  sharding version: {
        "_id" : 1,
        "minCompatibleVersion" : 5,
        "currentVersion" : 6,
        "clusterId" : ObjectId("5625fc29e3c17fdff8517b73")
}
  shards:
        {  "_id" : "shard1",  "host" : "shard1/172.16.16.124:40001,172.16.16.125:40001" }
        {  "_id" : "shard2",  "host" : "shard2/172.16.16.125:40002,172.16.16.126:40002" }
        {  "_id" : "shard3",  "host" : "shard3/172.16.16.126:40003,172.16.16.131:40003" }
        {  "_id" : "shard4",  "host" : "shard4/172.16.16.124:40004,172.16.16.131:40004" }
  balancer:
        Currently enabled:  yes
        Currently running:  yes
                Balancer lock taken at Tue Oct 20 2015 21:01:26 GMT+0800 (CST) by DataServer-04:50001:1445330413:1804289383:Balancer:846930886
        Failed balancer rounds in last 5 attempts:  0
        Migration Results for the last 24 hours:
                No recent migrations
  databases:
        {  "_id" : "admin",  "partitioned" : false,  "primary" : "config" }
        {  "_id" : "test",  "partitioned" : false,  "primary" : "shard1" }
        {  "_id" : "ljaidb",  "partitioned" : false,  "primary" : "shard1" }
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可以看出ljaidb库并没有分片,且数据都在shard1上,登录其他shard1上查看:
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bin]$ ./mongo 172.16.16.124:40001
MongoDB shell version: 3.0.7
connecting to: 172.16.16.124:40001/test
shard1:PRIMARY> show dbs
ljaidb  0.000GB
local   0.000GB
shard1:PRIMARY> use ljaidb
switched to db ljaidb
shard1:PRIMARY> show tables
ljaitable
shard1:PRIMARY> db.ljaitable.find().count()
10000
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验证shard2、shard3、shard4上都没有ljaidb这个库:
bin]$ ./mongo 172.16.16.125:40002
MongoDB shell version: 3.0.7
connecting to: 172.16.16.125:40002/test
shard2:PRIMARY> show dbs
local  0.000GB
  •  指定数据库和集合进行分片:

为了让某个数据库与集合自动分片生效,对数据库(lymdb)及数据库(lymtable)中的表进行分片配置:
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bin]$ ./mongo 172.16.16.124:50001
MongoDB shell version: 3.0.7
connecting to: 172.16.16.124:50001/test
mongos> use admin
switched to db admin
mongos> db.runCommand( { enablesharding :"lymdb"});
{ "ok" : 1 }
mongos> db.runCommand( { shardcollection : "lymdb.lymtable",key : {_id: 1} } )
{ "collectionsharded" : "lymdb.lymtable", "ok" : 1 }
 
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  • 通过java或者python驱动,连接mongo集群测试:

java连接代码:
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 1 import java.util.ArrayList;
 2 import java.util.List;
 3 
 4 import com.mongodb.BasicDBObject;
 5 import com.mongodb.DB;
 6 import com.mongodb.DBCollection;
 7 import com.mongodb.DBObject;
 8 import com.mongodb.MongoClient;
 9 import com.mongodb.ServerAddress;
10 
11 public class TestMongoDBShards {
12 
13     public static void main(String[] args) {
14          try {
15              List<ServerAddress> addresses = new ArrayList<ServerAddress>();
16              ServerAddress address1 = new ServerAddress("172.16.16.124" , 50001);
17              ServerAddress address2 = new ServerAddress("172.16.16.125" , 50001);
18              ServerAddress address3 = new ServerAddress("172.16.16.126" , 50001);
19              ServerAddress address4 = new ServerAddress("172.16.16.131" , 50001);
20              addresses.add(address1);
21             addresses.add(address2);
22             addresses.add(address3);
23 
24              MongoClient client = new MongoClient(addresses);
25              DB db = client.getDB( "lymdb" );
26              DBCollection coll = db.getCollection( "lymtable" );
27 
28            //  BasicDBObject object = new BasicDBObject();
29           //   object.append( "id" , 1);
30 
31           //   DBObject dbObject = coll.findOne(object);
32              
33              for(int i=1;i<=1000000;i++) {
34                  DBObject saveData=new BasicDBObject();  
35                  saveData.put("id", i);
36                  saveData.put("userName", "baiwan" + i);  
37                  saveData.put("age", "26");  
38                  saveData.put("gender", "m");  
39      
40      
41                  coll.save(saveData); 
42              }
43              
44  
45              
46 
47             // System. out .println(dbObject);
48 
49        } catch (Exception e) {
50              e.printStackTrace();
51        }
52         // TODO Auto-generated method stub
53 
54     }
55 
56 }
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python连接代码:

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 1 #encoding=UTF-8
 2 import datetime
 3 
 4 ISOTIMEFORMAT = ‘%Y-%m-%d %X‘
 5 
 6 from pymongo import MongoClient
 7 conn = MongoClient("172.16.16.124",50001)
 8 db = conn.funodb
 9 def dateDiffInSeconds(date1,date2):
10     timedelta = date2 - date1
11     return timedelta.days*24*3600 +timedelta.seconds
12 db.funotable.drop()
13 date1 = datetime.datetime.now()
14 for i  in range(0,1000000): db.funotable.insert({"name":"ljai","age":i,"addr":"fuzhou"})
15 c = db.funotable.find().count()
16 print("count is ",c)
17 date2 = datetime.datetime.now()
18 print(date1)
19 print(date2)
20 print("消耗:",dateDiffInSeconds(date1,date2),"seconds")
21 conn.close()
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  • 测试是否自动分片:

 
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mongos> db.lymtable.getShardDistribution()

Shard shard1 at shard1/172.16.16.124:40001,172.16.16.125:40001
data : 96.46MiB docs : 1216064 chunks : 4
estimated data per chunk : 24.11MiB
estimated docs per chunk : 304016

Shard shard2 at shard2/172.16.16.125:40002,172.16.16.126:40002
data : 44.9MiB docs : 565289 chunks : 4
estimated data per chunk : 11.22MiB
estimated docs per chunk : 141322

Shard shard3 at shard3/172.16.16.126:40003,172.16.16.131:40003
data : 99.39MiB docs : 1259979 chunks : 4
estimated data per chunk : 24.84MiB
estimated docs per chunk : 314994

Shard shard4 at shard4/172.16.16.124:40004,172.16.16.131:40004
data : 76.46MiB docs : 958668 chunks : 4
estimated data per chunk : 19.11MiB
estimated docs per chunk : 239667

Totals
data : 317.22MiB docs : 4000000 chunks : 16
Shard shard1 contains 30.4% data, 30.4% docs in cluster, avg obj size on shard : 83B
Shard shard2 contains 14.15% data, 14.13% docs in cluster, avg obj size on shard : 83B
Shard shard3 contains 31.33% data, 31.49% docs in cluster, avg obj size on shard : 82B
Shard shard4 contains 24.1% data, 23.96% docs in cluster, avg obj size on shard : 83B
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可以看出,插入400万条数据,都有分布各个shard上,但是不够均匀,需要进一步研究分片的配置。

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