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When sharding a collection with a hashed shard key but including invalid options will output the following error: mongos> sh.shardCollection("test.foo", {_id:"hashed"}, {pieinthesky:1}) { "ok" : 0, "errmsg" : "Hashed shard keys cannot be declared unique. It's possible to ensure uniqueness on the hashed field by declaring an additional (non-hashed) unique index on the field.", "code" : 72, "codeName" : "InvalidOptions", "operationTime" : Timestamp(1541185291, 4), "$clusterTime" : { "clusterTime" : Timestamp(1541185291, 4), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } } The problem is my invalid option, not the hashed shard key.
daniel.hatcher commented on Mon, 5 Nov 2018 16:35:55 +0000: Duplicates SERVER-37908 as the root issue is that the unique parameter (despite being optional) is required if options are specified.
Launch a sharded cluster sh.enableSharding("test") sh.shardCollection("test.foo", {_id:"hashed"}, {pieinthesky:1}) Error appears that is not indicative of the true problem
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