mongodb 分片集群備份恢復集合

mongodb 分片集群備份恢復

一、問題：當已經分片的集合備份後，恢復資料時不能按片鍵分片

二、解決方法：在恢復資料前建立集合分片規則

三、測試環境：

os: centos linux release 7.4.1708 (core)

mongo: mongodb shell version v4.0.22-rc0

物理機三颱：192.168.126.11、192.168.126.12、192.168.126.13

shard1: 192.168.126.11:27017(p)、192.168.126.12:27017(s)、192.168.126.13:27017(a) #p為主，s為從，a為仲

shard2: 192.168.126.11:27018(a)、192.168.126.12:27018(p)、192.168.126.13:27018(s)

shard3: 192.168.126.11:27019(s)、192.168.126.12:27019(a)、192.168.126.13:27019(p)

config: 192.168.126.11:27100(p)、192.168.126.12:27100(s)、192.168.126.13:27100(s)

mongos: 192.168.126.11:27000、192.168.126.12:27000、192.168.126.13:27000

測試集合z1.a4已經有集合分片策略

z1.a4    #z1庫a4集合
shard key: 
unique: false
balancing: true
chunks: #在shard1、2、3分別有chunk
shard1 2 
shard2 2
shard3 2
} -->> on : shard1 timestamp(1, 0) 
-->> on : shard1 timestamp(1, 1) 
-->> on : shard2 timestamp(1, 2) 
-->> on : shard2 timestamp(1, 3) 
-->> on : shard3 timestamp(1, 4) 
-->> } on : shard3 timestamp(1, 5)

四、操作步驟：

1、停止balancer

mongos> sh.getbalancerstate()    #balancer狀態，可用
true
mongos> sh.stopbalancer() #停止balancer }}
mongos> sh.getbalancerstate() #balancer狀態，不可用
false

2、匯出資料庫z1

[root@v1 ~]# mongodump -h 192.168.126.11:27000 -d z1 -o ~/z1_mongos_202102151206.bak 2021-02-15t12:06:45.118+0800 writing z1.a4 to 2021-02-15t12:06:45.118+0800 writing z1.a1 to 2021-02-15t12:06:45.118+0800 writing z1.a3 to 2021-02-15t12:06:45.118+0800 writing z1.a2 to 2021-02-15t12:06:45.247+0800 done dumping z1.a2 (1000 documents) 2021-02-15t12:06:45.248+0800 writing z1.tt to 2021-02-15t12:06:45.248+0800 done dumping z1.a3 (1000 documents) 2021-02-15t12:06:45.248+0800 writing z1.a5 to 2021-02-15t12:06:45.268+0800 done dumping z1.tt (1 document) 2021-02-15t12:06:45.270+0800 done dumping z1.a5 (0 documents) 2021-02-15t12:06:45.279+0800 done dumping z1.a1 (2000 documents)

2021-02-15t12:06:45.969+0800 done dumping z1.a4 (11000 documents) #11000條資料

3、刪除a4集合，不建立集合分片策略直接匯入

#刪除a4集合
mongos> use z1
switched to db z1
mongos> db.a4.drop()
true
#匯入a4集合
[root@v1 ~]# mongorestore -h 192.168.126.11:27000 -d z1 -c a4 ~/z1_mongos_202102151206.bak/z1/a4.bson 
2021-02-15t12:11:59.879+0800 checking for collection data in /root/z1_mongos_202102151206.bak/z1/a4.bson
2021-02-15t12:11:59.883+0800 reading metadata for z1.a4 from /root/z1_mongos_202102151206.bak/z1/a4.metadata.json
2021-02-15t12:11:59.938+0800 restoring z1.a4 from /root/z1_mongos_202102151206.bak/z1/a4.bson
2021-02-15t12:12:00.984+0800 restoring indexes for collection z1.a4 from metadata
2021-02-15t12:12:01.054+0800 finished restoring z1.a4 (11000 documents)
2021-02-15t12:12:01.054+0800 done
#檢視a4集合狀態
mongos> db.a4.stats() }}
#建立z1.a4集合的分片策略，根據name欄位的hash
mongos> sh.shardcollection('z1.a4', ) }}
#sh.status()
z1.a4 #可看到分片
shard key: 
unique: false
balancing: true
chunks:
shard1 7
shard2 8
shard3 7
too many chunks to print, use verbose if you want to force print
#匯入集合
[root@v1 ~]# mongorestore -h 192.168.126.11:27000 -d z1 -c a4 ~/z1_mongos_202102151206.bak/z1/a4.bson 
2021-02-15t12:54:58.421+0800 checking for collection data in /root/z1_mongos_202102151206.bak/z1/a4.bson
2021-02-15t12:54:58.431+0800 reading metadata for z1.a4 from /root/z1_mongos_202102151206.bak/z1/a4.metadata.json
2021-02-15t12:54:58.431+0800 restoring z1.a4 from /root/z1_mongos_202102151206.bak/z1/a4.bson
2021-02-15t12:54:59.884+0800 restoring indexes for collection z1.a4 from metadata
2021-02-15t12:54:59.886+0800 finished restoring z1.a4 (11000 documents)
2021-02-15t12:54:59.886+0800 done
#驗證mongos> db.a4.stats() }}
mongos> sh.status()
--- sharding status --- 
sharding version: 
shards:
active mongoses:
"4.0.22-rc0" : 3
autosplit:
currently enabled: yes
balancer:
currently enabled: yes #驗證當前balancer狀態
currently running: no
failed balancer rounds in last 5 attempts: 0

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