mongodb shard集羣擴容和收縮
集羣搭建參考http://my.oschina.net/u/1791060/blog/652600mongodb
在這個集羣的基礎上再加個shard-4 mongodb-shard-4:shell
192.168.10.91:10003數據庫
192.168.10.92:10003服務器
192.168.10.93:10003app
###shard集羣水平擴展 ####在上述三臺服務器上啓動shard4的mongodb實例 # mkdir -p /data/mongodb/shard4.net
# mongod --shardsvr --replSet shard4 --port 10003 --dbpath /data/mongodb/shard4 --oplogSize 100 --logpath /data/mongodb/shard4/shard4.log --logappend --forkcode
####創建shard關係blog
# mongo --port 10003
MongoDB shell version: 2.4.14
connecting to: 127.0.0.1:10003/test
> config={_id:'shard4',members:[{_id:0,host:'192.168.10.91:10003'},{_id:1,host:'192.168.10.92:10003'},{_id:2,host:'192.168.10.93:100023'}]}
{
"_id" : "shard4",
"members" : [
{
"_id" : 0,
"host" : "192.168.10.91:10003"
},
{
"_id" : 1,
"host" : "192.168.10.92:10003"
},
{
"_id" : 2,
"host" : "192.168.10.93:10003"
}
]
}
> rs.initiate(config)
{
"info" : "Config now saved locally. Should come online in about a minute.",
"ok" : 1
}
>
shard4:PRIMARY>
####mongos上添加shard4rem
]# mongo --port 30000
MongoDB shell version: 2.4.14
connecting to: 127.0.0.1:30000/test
mongos> use admin
switched to db admin
mongos> db.runCommand({addshard:'shard4/192.168.10.91:10003,192.168.10.92:10003,192.168.10.93:10003'})
{ "shardAdded" : "shard4", "ok" : 1 }
####查看集羣狀態get
- 查看集羣狀態
mongos> printShardingStatus()
--- Sharding Status ---
sharding version: {
"_id" : 1,
"version" : 3,
"minCompatibleVersion" : 3,
"currentVersion" : 4,
"clusterId" : ObjectId("570394b40d1b67f7f38c434a")
}
shards:
{ "_id" : "shard1", "host" : "shard1/192.168.10.91:10000,192.168.10.92:10000,192.168.10.93:10000" }
{ "_id" : "shard2", "host" : "shard2/192.168.10.91:10001,192.168.10.92:10001,192.168.10.93:10001" }
{ "_id" : "shard3", "host" : "shard3/192.168.10.91:10002,192.168.10.92:10002,192.168.10.93:10002" }
{ "_id" : "shard4", "host" : "shard4/192.168.10.91:10003,192.168.10.92:10003,192.168.10.93:10003" }
databases:
{ "_id" : "admin", "partitioned" : false, "primary" : "config" }
{ "_id" : "test", "partitioned" : false, "primary" : "shard3" }
{ "_id" : "testdb", "partitioned" : true, "primary" : "shard1" }
testdb.table1
shard key: { "_id" : 1 }
chunks:
shard4 1
shard1 1
shard2 2
shard3 2
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : ObjectId("57039cd208bca3c16785e081") } on : shard4 Timestamp(5, 0)
{ "_id" : ObjectId("57039cd208bca3c16785e081") } -->> { "_id" : ObjectId("57039d9708bca3c167860949") } on : shard1 Timestamp(5, 1)
{ "_id" : ObjectId("57039d9708bca3c167860949") } -->> { "_id" : ObjectId("57039d9e08bca3c167865f9e") } on : shard2 Timestamp(3, 1)
{ "_id" : ObjectId("57039d9e08bca3c167865f9e") } -->> { "_id" : ObjectId("57039da408bca3c16786aadb") } on : shard2 Timestamp(4, 0)
{ "_id" : ObjectId("57039da408bca3c16786aadb") } -->> { "_id" : ObjectId("57039da508bca3c16786f705") } on : shard3 Timestamp(4, 1)
{ "_id" : ObjectId("57039da508bca3c16786f705") } -->> { "_id" : { "$maxKey" : 1 } } on : shard3 Timestamp(3, 5)
###shard集羣收縮 ####縮減shard1
- mongos上剔除shard1
mongos> db.runCommand({removeshard:"shard1/192.168.10.91:10000,192.168.10.92:10000,192.168.10.93:10000"})
{
"msg" : "draining started successfully",
"state" : "started",
"shard" : "shard1",
"note" : "you need to drop or movePrimary these databases",
"dbsToMove" : [
"testdb"
],
"ok" : 1
}
- 查看shard1的狀態，顯示draining，正在移除
mongos> printShardingStatus()
--- Sharding Status ---
sharding version: {
"_id" : 1,
"version" : 3,
"minCompatibleVersion" : 3,
"currentVersion" : 4,
"clusterId" : ObjectId("570394b40d1b67f7f38c434a")
}
shards:
{ "_id" : "shard1", "draining" : true, "host" : "shard1/192.168.10.91:10000,192.168.10.92:10000,192.168.10.93:10000" }
{ "_id" : "shard2", "host" : "shard2/192.168.10.91:10001,192.168.10.92:10001,192.168.10.93:10001" }
{ "_id" : "shard3", "host" : "shard3/192.168.10.91:10002,192.168.10.92:10002,192.168.10.93:10002" }
{ "_id" : "shard4", "host" : "shard4/192.168.10.91:10003,192.168.10.92:10003,192.168.10.93:10003" }
databases:
{ "_id" : "admin", "partitioned" : false, "primary" : "config" }
{ "_id" : "test", "partitioned" : false, "primary" : "shard3" }
{ "_id" : "testdb", "partitioned" : true, "primary" : "shard1" }
testdb.table1
shard key: { "_id" : 1 }
chunks:
shard4 2
shard2 2
shard3 2
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : ObjectId("57039cd208bca3c16785e081") } on : shard4 Timestamp(5, 0)
{ "_id" : ObjectId("57039cd208bca3c16785e081") } -->> { "_id" : ObjectId("57039d9708bca3c167860949") } on : shard4 Timestamp(6, 0)
{ "_id" : ObjectId("57039d9708bca3c167860949") } -->> { "_id" : ObjectId("57039d9e08bca3c167865f9e") } on : shard2 Timestamp(3, 1)
{ "_id" : ObjectId("57039d9e08bca3c167865f9e") } -->> { "_id" : ObjectId("57039da408bca3c16786aadb") } on : shard2 Timestamp(4, 0)
{ "_id" : ObjectId("57039da408bca3c16786aadb") } -->> { "_id" : ObjectId("57039da508bca3c16786f705") } on : shard3 Timestamp(4, 1)
{ "_id" : ObjectId("57039da508bca3c16786f705") } -->> { "_id" : { "$maxKey" : 1 } } on : shard3 Timestamp(3, 5)
- 再次執行removed可查看進度，chunks爲0即爲完成,可是dbs須要執行movePrimary
mongos> db.runCommand({removeshard:"shard1/192.168.10.91:10000,192.168.10.92:10000,192.168.10.93:10000"})
{
"msg" : "draining ongoing",
"state" : "ongoing",
"remaining" : {
"chunks" : NumberLong(0),
"dbs" : NumberLong(1)
},
"note" : "you need to drop or movePrimary these databases",
"dbsToMove" : [
"testdb"
],
"ok" : 1
}
- 移動數據庫 #可查看config.databases發現原來primary在shard1上，如今挪至shard2
mongos> db.runCommand({movePrimary:'testdb',to:'shard2'})
{
"primary " : "shard2:shard2/192.168.10.91:10001,192.168.10.92:10001,192.168.10.93:10001",
"ok" : 1
}
mongos> db.runCommand({removeshard:'shard1'})
{
"msg" : "removeshard completed successfully",
"state" : "completed",
"shard" : "shard1",
"ok" : 1
}
- 再次查看分片信息發現shard已移除
mongos> printShardingStatus()
--- Sharding Status ---
sharding version: {
"_id" : 1,
"version" : 3,
"minCompatibleVersion" : 3,
"currentVersion" : 4,
"clusterId" : ObjectId("570394b40d1b67f7f38c434a")
}
shards:
{ "_id" : "shard2", "host" : "shard2/192.168.10.91:10001,192.168.10.92:10001,192.168.10.93:10001" }
{ "_id" : "shard3", "host" : "shard3/192.168.10.91:10002,192.168.10.92:10002,192.168.10.93:10002" }
{ "_id" : "shard4", "host" : "shard4/192.168.10.91:10003,192.168.10.92:10003,192.168.10.93:10003" }
databases:
{ "_id" : "admin", "partitioned" : false, "primary" : "config" }
{ "_id" : "test", "partitioned" : false, "primary" : "shard3" }
{ "_id" : "testdb", "partitioned" : true, "primary" : "shard2" }
testdb.table1
shard key: { "_id" : 1 }
chunks:
shard4 2
shard2 2
shard3 2
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : ObjectId("57039cd208bca3c16785e081") } on : shard4 Timestamp(5, 0)
{ "_id" : ObjectId("57039cd208bca3c16785e081") } -->> { "_id" : ObjectId("57039d9708bca3c167860949") } on : shard4 Timestamp(6, 0)
{ "_id" : ObjectId("57039d9708bca3c167860949") } -->> { "_id" : ObjectId("57039d9e08bca3c167865f9e") } on : shard2 Timestamp(3, 1)
{ "_id" : ObjectId("57039d9e08bca3c167865f9e") } -->> { "_id" : ObjectId("57039da408bca3c16786aadb") } on : shard2 Timestamp(4, 0)
{ "_id" : ObjectId("57039da408bca3c16786aadb") } -->> { "_id" : ObjectId("57039da508bca3c16786f705") } on : shard3 Timestamp(4, 1)
{ "_id" : ObjectId("57039da508bca3c16786f705") } -->> { "_id" : { "$maxKey" : 1 } } on : shard3 Timestamp(3, 5)
{ "_id" : "testdb1", "partitioned" : false, "primary" : "shard2" }
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