MongoDB分片集群之移除分片节点
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了MongoDB分片集群之移除分片节点，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含14869字，纯文字阅读大概需要22分钟。
内容图文
我们从分片集群里移除hdshard4分片。
查看分片集群状态
mongos> sh.status()
--- Sharding Status ---
sharding version: {
"_id" : 1,
"minCompatibleVersion" : 5,
"currentVersion" : 6,
"clusterId" : ObjectId("60545017224c766911a9c440")
}
shards:
{ "_id" : "hdshard1", "host" : "hdshard1/172.16.254.136:40001,172.16.254.137:40001,172.16.254.138:40001", "state" : 1 }
{ "_id" : "hdshard2", "host" : "hdshard2/172.16.254.136:40002,172.16.254.137:40002,172.16.254.138:40002", "state" : 1 }
{ "_id" : "hdshard3", "host" : "hdshard3/172.16.254.136:40003,172.16.254.137:40003,172.16.254.138:40003", "state" : 1 }
{ "_id" : "hdshard4", "host" : "hdshard4/172.16.254.139:40005,172.16.254.139:40006,172.16.254.139:40007", "state" : 1 }
active mongoses:
"4.2.12" : 3
autosplit:
Currently enabled: yes
balancer:
Currently enabled: yes
Currently running: no
Failed balancer rounds in last 5 attempts: 2
Last reported error: Could not find host matching read preference { mode: "primary" } for set hdshard4
Time of Reported error: Mon Apr 19 2021 17:11:42 GMT+0800 (CST)
Migration Results for the last 24 hours:
289 : Success
11 : Failed with error 'aborted', from hdshard1 to hdshard4
14 : Failed with error 'aborted', from hdshard2 to hdshard4
3 : Failed with error 'aborted', from hdshard3 to hdshard4
databases:
{ "_id" : "config", "primary" : "config", "partitioned" : true }
config.system.sessions
shard key: { "_id" : 1 }
unique: false
balancing: true
chunks:
hdshard1 256
hdshard2 256
hdshard3 256
hdshard4 256
too many chunks to print, use verbose if you want to force print
{ "_id" : "db1", "primary" : "hdshard3", "partitioned" : true, "version" : { "uuid" : UUID("71bb472c-7896-4a31-a77c-e3aaf723be3c"), "lastMod" : 1 } }
{ "_id" : "db2", "primary" : "hdshard4", "partitioned" : false, "version" : { "uuid" : UUID("add90941-a8b1-4c40-94e9-9ccc38d73096"), "lastMod" : 1 } }
{ "_id" : "recommend", "primary" : "hdshard1", "partitioned" : true, "version" : { "uuid" : UUID("cb833b8e-cc4f-4c52-83c3-719aa383bac4"), "lastMod" : 1 } }
recommend.rcmd_1_min_tag_mei_rong
shard key: { "_id" : "hashed" }
unique: false
balancing: true
chunks:
hdshard1 2
hdshard2 2
hdshard3 2
hdshard4 2
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : NumberLong("-6701866976688134138") } on : hdshard4 Timestamp(7, 0)
{ "_id" : NumberLong("-6701866976688134138") } -->> { "_id" : NumberLong("-4163240026901542572") } on : hdshard3 Timestamp(3, 0)
{ "_id" : NumberLong("-4163240026901542572") } -->> { "_id" : NumberLong("-1616330844721205691") } on : hdshard2 Timestamp(7, 1)
{ "_id" : NumberLong("-1616330844721205691") } -->> { "_id" : NumberLong("909129560750995399") } on : hdshard3 Timestamp(5, 0)
{ "_id" : NumberLong("909129560750995399") } -->> { "_id" : NumberLong("3449289120186727718") } on : hdshard2 Timestamp(6, 0)
{ "_id" : NumberLong("3449289120186727718") } -->> { "_id" : NumberLong("5980358241733552715") } on : hdshard4 Timestamp(8, 0)
{ "_id" : NumberLong("5980358241733552715") } -->> { "_id" : NumberLong("8520801504243263436") } on : hdshard1 Timestamp(8, 1)
{ "_id" : NumberLong("8520801504243263436") } -->> { "_id" : { "$maxKey" : 1 } } on : hdshard1 Timestamp(1, 7)
recommend.rcmd_1_tag_li_liao
shard key: { "_id" : 1 }
unique: false
balancing: true
chunks:
hdshard1 27
hdshard2 27
hdshard3 27
hdshard4 26
too many chunks to print, use verbose if you want to force print查看所有数据的分片状态
mongos> db.databases.find()
{ "_id" : "recommend", "primary" : "hdshard1", "partitioned" : true, "version" : { "uuid" : UUID("cb833b8e-cc4f-4c52-83c3-719aa383bac4"), "lastMod" : 1 } }
{ "_id" : "db1", "primary" : "hdshard3", "partitioned" : true, "version" : { "uuid" : UUID("71bb472c-7896-4a31-a77c-e3aaf723be3c"), "lastMod" : 1 } }
{ "_id" : "db2", "primary" : "hdshard4", "partitioned" : false, "version" : { "uuid" : UUID("add90941-a8b1-4c40-94e9-9ccc38d73096"), "lastMod" : 1 } }
可以看到hdshard4还充当了db2库的primary节点。
删除分片
mongos> use admin
switched to db admin
mongos> db.runCommand( { removeShard: "hdshard4" } )
{
"msg" : "draining started successfully",
"state" : "started",
"shard" : "hdshard4",
"note" : "you need to drop or movePrimary these databases",
"dbsToMove" : [
"db2"
],
"ok" : 1,
"operationTime" : Timestamp(1618825477, 2),
"$clusterTime" : {
"clusterTime" : Timestamp(1618825477, 2),
"signature" : {
"hash" : BinData(0,"l0H3goYxmKMOFF1aWq5rCZcdhS8="),
"keyId" : NumberLong("6941260985399246879")
}
}
}
看到提示信息：db2在hdshard4上边，you need to drop or movePrimary these databases。我们先不管先往下做。监控chunks迁移进展。
查看rcmd_1_tag_li_liao分片信息
mongos> db.rcmd_1_tag_li_liao.getShardDistribution()
Shard hdshard1 at hdshard1/172.16.254.136:40001,172.16.254.137:40001,172.16.254.138:40001
data : 1.14GiB docs : 125924 chunks : 35
estimated data per chunk : 33.61MiB
estimated docs per chunk : 3597
Shard hdshard4 at hdshard4/172.16.254.139:40005,172.16.254.139:40006,172.16.254.139:40007
data : 826.72MiB docs : 92767 chunks : 2
estimated data per chunk : 413.36MiB
estimated docs per chunk : 46383
Shard hdshard3 at hdshard3/172.16.254.136:40003,172.16.254.137:40003,172.16.254.138:40003
data : 1.06GiB docs : 124880 chunks : 35
estimated data per chunk : 31.28MiB
estimated docs per chunk : 3568
Shard hdshard2 at hdshard2/172.16.254.136:40002,172.16.254.137:40002,172.16.254.138:40002
data : 1.06GiB docs : 124879 chunks : 35
estimated data per chunk : 31.26MiB
estimated docs per chunk : 3567
Totals
data : 4.09GiB docs : 468450 chunks : 107
Shard hdshard1 contains 28.06% data, 26.88% docs in cluster, avg obj size on shard : 9KiB
Shard hdshard4 contains 19.71% data, 19.8% docs in cluster, avg obj size on shard : 9KiB
Shard hdshard3 contains 26.11% data, 26.65% docs in cluster, avg obj size on shard : 8KiB
Shard hdshard2 contains 26.09% data, 26.65% docs in cluster, avg obj size on shard : 8KiB
mongos>
mongos>
mongos>
mongos>
mongos> db.rcmd_1_tag_li_liao.getShardDistribution()
Shard hdshard2 at hdshard2/172.16.254.136:40002,172.16.254.137:40002,172.16.254.138:40002
data : 1.06GiB docs : 124879 chunks : 35
estimated data per chunk : 31.26MiB
estimated docs per chunk : 3567
Shard hdshard1 at hdshard1/172.16.254.136:40001,172.16.254.137:40001,172.16.254.138:40001
data : 1.16GiB docs : 127813 chunks : 36
estimated data per chunk : 33.18MiB
estimated docs per chunk : 3550
Shard hdshard3 at hdshard3/172.16.254.136:40003,172.16.254.137:40003,172.16.254.138:40003
data : 1.1GiB docs : 128448 chunks : 36
estimated data per chunk : 31.36MiB
estimated docs per chunk : 3568
Totals
data : 3.33GiB docs : 381140 chunks : 107
Shard hdshard2 contains 32.01% data, 32.76% docs in cluster, avg obj size on shard : 8KiB
Shard hdshard1 contains 34.95% data, 33.53% docs in cluster, avg obj size on shard : 9KiB
Shard hdshard3 contains 33.03% data, 33.7% docs in cluster, avg obj size on shard : 9KiB
可以看到hdshard4已经被移除。
查看分片集状态
mongos> sh.status()
--- Sharding Status ---
sharding version: {
"_id" : 1,
"minCompatibleVersion" : 5,
"currentVersion" : 6,
"clusterId" : ObjectId("60545017224c766911a9c440")
}
shards:
{ "_id" : "hdshard1", "host" : "hdshard1/172.16.254.136:40001,172.16.254.137:40001,172.16.254.138:40001", "state" : 1 }
{ "_id" : "hdshard2", "host" : "hdshard2/172.16.254.136:40002,172.16.254.137:40002,172.16.254.138:40002", "state" : 1 }
{ "_id" : "hdshard3", "host" : "hdshard3/172.16.254.136:40003,172.16.254.137:40003,172.16.254.138:40003", "state" : 1 }
{ "_id" : "hdshard4", "host" : "hdshard4/172.16.254.139:40005,172.16.254.139:40006,172.16.254.139:40007", "state" : 1, "draining" : true }
active mongoses:
"4.2.12" : 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:
572 : Success
14 : Failed with error 'aborted', from hdshard2 to hdshard4
5 : Failed with error 'aborted', from hdshard4 to hdshard2
1 : Failed with error 'aborted', from hdshard4 to hdshard3
3 : Failed with error 'aborted', from hdshard4 to hdshard1
11 : Failed with error 'aborted', from hdshard1 to hdshard4
3 : Failed with error 'aborted', from hdshard3 to hdshard4
databases:
{ "_id" : "config", "primary" : "config", "partitioned" : true }
config.system.sessions
shard key: { "_id" : 1 }
unique: false
balancing: true
chunks:
hdshard1 342
hdshard2 341
hdshard3 341
too many chunks to print, use verbose if you want to force print
{ "_id" : "db1", "primary" : "hdshard3", "partitioned" : true, "version" : { "uuid" : UUID("71bb472c-7896-4a31-a77c-e3aaf723be3c"), "lastMod" : 1 } }
{ "_id" : "db2", "primary" : "hdshard4", "partitioned" : false, "version" : { "uuid" : UUID("add90941-a8b1-4c40-94e9-9ccc38d73096"), "lastMod" : 1 } }
{ "_id" : "recommend", "primary" : "hdshard1", "partitioned" : true, "version" : { "uuid" : UUID("cb833b8e-cc4f-4c52-83c3-719aa383bac4"), "lastMod" : 1 } }
recommend.rcmd_1_min_tag_mei_rong
shard key: { "_id" : "hashed" }
unique: false
balancing: true
chunks:
hdshard1 2
hdshard2 3
hdshard3 3
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : NumberLong("-6701866976688134138") } on : hdshard3 Timestamp(9, 0)
{ "_id" : NumberLong("-6701866976688134138") } -->> { "_id" : NumberLong("-4163240026901542572") } on : hdshard3 Timestamp(3, 0)
{ "_id" : NumberLong("-4163240026901542572") } -->> { "_id" : NumberLong("-1616330844721205691") } on : hdshard2 Timestamp(7, 1)
{ "_id" : NumberLong("-1616330844721205691") } -->> { "_id" : NumberLong("909129560750995399") } on : hdshard3 Timestamp(5, 0)
{ "_id" : NumberLong("909129560750995399") } -->> { "_id" : NumberLong("3449289120186727718") } on : hdshard2 Timestamp(6, 0)
{ "_id" : NumberLong("3449289120186727718") } -->> { "_id" : NumberLong("5980358241733552715") } on : hdshard2 Timestamp(10, 0)
{ "_id" : NumberLong("5980358241733552715") } -->> { "_id" : NumberLong("8520801504243263436") } on : hdshard1 Timestamp(8, 1)
{ "_id" : NumberLong("8520801504243263436") } -->> { "_id" : { "$maxKey" : 1 } } on : hdshard1 Timestamp(1, 7)
recommend.rcmd_1_tag_li_liao
shard key: { "_id" : 1 }
unique: false
balancing: true
chunks:
hdshard1 36
hdshard2 35
hdshard3 36
too many chunks to print, use verbose if you want to force print可以看到hdshard4的状态是draining，结合我们移除分片时候的提示，我们现在进行moveprimary。注意是在admin库下。
moveprimary
mongos> use admin
switched to db admin
mongos> db.runCommand({"moveprimary":"db2","to":"hdshard2"})
{
"ok" : 1,
"operationTime" : Timestamp(1618828614, 2007),
"$clusterTime" : {
"clusterTime" : Timestamp(1618828614, 2007),
"signature" : {
"hash" : BinData(0,"v/C6nLIAKa1Fc16/ICGk3N5+dvc="),
"keyId" : NumberLong("6941260985399246879")
}
}
}
查看数据库分片
mongos> db.databases.find()
{ "_id" : "recommend", "primary" : "hdshard1", "partitioned" : true, "version" : { "uuid" : UUID("cb833b8e-cc4f-4c52-83c3-719aa383bac4"), "lastMod" : 1 } }
{ "_id" : "db1", "primary" : "hdshard3", "partitioned" : true, "version" : { "uuid" : UUID("71bb472c-7896-4a31-a77c-e3aaf723be3c"), "lastMod" : 1 } }
{ "_id" : "db2", "primary" : "hdshard2", "partitioned" : false, "version" : { "uuid" : UUID("add90941-a8b1-4c40-94e9-9ccc38d73096"), "lastMod" : 2 } }
可以看到db2已经迁移到hdshard2。
继续删除分片
mongos> use admin
switched to db admin
mongos> db.runCommand( { removeShard: "hdshard4" } )
{
"msg" : "removeshard completed successfully",
"state" : "completed",
"shard" : "hdshard4",
"ok" : 1,
"operationTime" : Timestamp(1618828812, 2),
"$clusterTime" : {
"clusterTime" : Timestamp(1618828812, 2),
"signature" : {
"hash" : BinData(0,"15Wkccw2xFhMFYWCFaEDXbpSH7E="),
"keyId" : NumberLong("6941260985399246879")
}
}
}
可以看到提示显示：hdshard4移除已经completed。
查看分片集群状态
mongos> sh.status()
--- Sharding Status ---
sharding version: {
"_id" : 1,
"minCompatibleVersion" : 5,
"currentVersion" : 6,
"clusterId" : ObjectId("60545017224c766911a9c440")
}
shards:
{ "_id" : "hdshard1", "host" : "hdshard1/172.16.254.136:40001,172.16.254.137:40001,172.16.254.138:40001", "state" : 1 }
{ "_id" : "hdshard2", "host" : "hdshard2/172.16.254.136:40002,172.16.254.137:40002,172.16.254.138:40002", "state" : 1 }
{ "_id" : "hdshard3", "host" : "hdshard3/172.16.254.136:40003,172.16.254.137:40003,172.16.254.138:40003", "state" : 1 }
active mongoses:
"4.2.12" : 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:
572 : Success
1 : Failed with error 'aborted', from hdshard4 to hdshard3
5 : Failed with error 'aborted', from hdshard4 to hdshard2
14 : Failed with error 'aborted', from hdshard2 to hdshard4
3 : Failed with error 'aborted', from hdshard3 to hdshard4
11 : Failed with error 'aborted', from hdshard1 to hdshard4
3 : Failed with error 'aborted', from hdshard4 to hdshard1
databases:
{ "_id" : "config", "primary" : "config", "partitioned" : true }
config.system.sessions
shard key: { "_id" : 1 }
unique: false
balancing: true
chunks:
hdshard1 342
hdshard2 341
hdshard3 341
too many chunks to print, use verbose if you want to force print
{ "_id" : "db1", "primary" : "hdshard3", "partitioned" : true, "version" : { "uuid" : UUID("71bb472c-7896-4a31-a77c-e3aaf723be3c"), "lastMod" : 1 } }
{ "_id" : "db2", "primary" : "hdshard2", "partitioned" : false, "version" : { "uuid" : UUID("add90941-a8b1-4c40-94e9-9ccc38d73096"), "lastMod" : 2 } }
{ "_id" : "recommend", "primary" : "hdshard1", "partitioned" : true, "version" : { "uuid" : UUID("cb833b8e-cc4f-4c52-83c3-719aa383bac4"), "lastMod" : 1 } }
recommend.rcmd_1_min_tag_mei_rong
shard key: { "_id" : "hashed" }
unique: false
balancing: true
chunks:
hdshard1 2
hdshard2 3
hdshard3 3
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : NumberLong("-6701866976688134138") } on : hdshard3 Timestamp(9, 0)
{ "_id" : NumberLong("-6701866976688134138") } -->> { "_id" : NumberLong("-4163240026901542572") } on : hdshard3 Timestamp(3, 0)
{ "_id" : NumberLong("-4163240026901542572") } -->> { "_id" : NumberLong("-1616330844721205691") } on : hdshard2 Timestamp(7, 1)
{ "_id" : NumberLong("-1616330844721205691") } -->> { "_id" : NumberLong("909129560750995399") } on : hdshard3 Timestamp(5, 0)
{ "_id" : NumberLong("909129560750995399") } -->> { "_id" : NumberLong("3449289120186727718") } on : hdshard2 Timestamp(6, 0)
{ "_id" : NumberLong("3449289120186727718") } -->> { "_id" : NumberLong("5980358241733552715") } on : hdshard2 Timestamp(10, 0)
{ "_id" : NumberLong("5980358241733552715") } -->> { "_id" : NumberLong("8520801504243263436") } on : hdshard1 Timestamp(8, 1)
{ "_id" : NumberLong("8520801504243263436") } -->> { "_id" : { "$maxKey" : 1 } } on : hdshard1 Timestamp(1, 7)
recommend.rcmd_1_tag_li_liao
shard key: { "_id" : 1 }
unique: false
balancing: true
chunks:
hdshard1 36
hdshard2 35
hdshard3 36
too many chunks to print, use verbose if you want to force print
hdshard4的信息已经完全看不到。
注意事项：必须检查分片集群状态，保障要被移除的分片完全移除完毕。
内容总结
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