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Type:
Bug
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Resolution: Duplicate
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: None
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None
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ALL
Enable sharding, shard a collection with a subdocument field, add tag range, tag a shard:
sh.enableSharding("test") sh.shardCollection("test.foo", {"a.b": 1}) sh.addTagRange("test.foo", {a: {b: "AP"}}, {a: {b: "AQ"}}, "AP") sh.addShardTag("shard0002", "AP") // or pick a shard that's NOT the primary shard
This gives an error in the logs
Wed Apr 23 12:03:52.252 [Balancer] Assertion: 16634:field names of bound { a: { b: "AP" } } do not match those of keyPattern { a.b: 1.0 }
0x1002a106b 0x10027d71e 0x10027d7dd 0x1000f256e 0x10016216e 0x10015fae6 0x10027edb5 0x10027f4ea 0x10027f5b6 0x10027f676 0x1002d39e5 0x7fff91189899 0x7fff9118972a 0x7fff9118dfc9
As this error suggests, this doesn't work:
db.foo.insert({a: {b: "AP"}, i:1})
sh.status() // shows chunk still on primary shard, not tagged shard
We can't make the shard tag match the shard key:
> sh.addTagRange("test.foo", {"a.b": "AP"}, {"a.b": "AQ"}, "AP") Wed Apr 23 12:06:41.756 JavaScript execution failed: can't have . in field names [a.b] at src/mongo/shell/collection.js:L143
This is because sh.addTagRange() is basically doing this:
use config
db.tags.insert({ "_id" : { "ns" : "test.foo", "min" : { "a.b" : "AP" } }, "ns" : "test.foo", "min" : { "a.b" : "AP" }, "max" : { "a.b" : "AQ" }, "tag" : "AP" })
And although these are valid javascript and JSON field names, they are not valid for MongoDB (https://docs.mongodb.org/manual/reference/limits/#Restrictions-on-Field-Names)
We also can't change the shard key format:
> sh.shardCollection("test.bar", {a: {b:1}}) { "ok" : 0, "errmsg" : "Unsupported shard key pattern. Pattern must either be a single hashed field, or a list of ascending fields." }
- duplicates
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SERVER-6999 Embedded "dot-notation" fields broken for tag based balancing
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- Closed
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