mongodb 3.4 学习 (四）分片
# 配置分片 # 允许分片的数据库sh.enableSharding('app')
# 为用做shard key的字段建立索引，实际中可以用uuid字段
use app
db.demo.createIndex({id: 1})
{
"raw" : {
"shard1/10.0.70.104:27021,10.0.70.104:27022,10.0.70.104:27023" : {
"createdCollectionAutomatically" : false,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1,
"$gleStats" : {
"lastOpTime" : {
"ts" : Timestamp(1495675335, 1),
"t" : NumberLong(1)
},
"electionId" : ObjectId("7fffffff0000000000000001")
}
}
},
"ok" : 1
}
# 允许分片的collection，指定shard key的字段
sh.shardCollection('app.demo', {> { "collectionsharded" : "app.demo", "ok" : 1 }
# 插入数据
for (var i = 1; i < 10000; i++) db.demo.insert({id: i, name: 'ken'})
WriteResult({ "nInserted" : 1 })
# 查看状态，可以看到db与collection的分片状态
sh.status()
--- Sharding Status ---
sharding version: {
"_id" : 1,
"minCompatibleVersion" : 5,
"currentVersion" : 6,
"clusterId" : ObjectId("59261bca37ceff575b36ef09")
}
shards:
{"_id" : "shard1","host" : "shard1/10.0.70.104:27021,10.0.70.104:27022,10.0.70.104:27023","state" : 1 }
{"_id" : "shard2","host" : "shard2/10.0.70.105:27021,10.0.70.105:27022,10.0.70.105:27023","state" : 1 }
active mongoses:
"3.4.4" : 1
autosplit:
Currently enabled: yes
balancer:
Currently enabled:yes
Currently running:no
Balancer lock taken at Thu May 25 2017 07:48:42 GMT+0800 (CST) by ConfigServer:Balancer
Failed balancer rounds in last 5 attempts:0
Migration Results for the last 24 hours:
1 : Success
databases:
{"_id" : "app","primary" : "shard1","partitioned" : true }
app.demo
shard key: { "id" : "hashed" }
unique: false
balancing: true
chunks:
shard12
shard22
{ "id" : { "$minKey" : 1 } } -->> { "id" : NumberLong("-4611686018427387902") } on : shard1 Timestamp(2, 2)
{ "id" : NumberLong("-4611686018427387902") } -->> { "id" : NumberLong(0) } on : shard1 Timestamp(2, 3)
{ "id" : NumberLong(0) } -->> { "id" : NumberLong("4611686018427387902") } on : shard2 Timestamp(2, 4)
{ "id" : NumberLong("4611686018427387902") } -->> { "id" : { "$maxKey" : 1 } } on : shard2 Timestamp(2, 5)
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