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Type:
New Feature
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Resolution: Unresolved
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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: Aggregation Framework, Querying
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Query Optimization
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Query 2019-07-29, Query 2019-10-07
For troubleshooting and testing purposes it could be very helpful to be able to quickly check data distribution in a collection. This could be done by adding an ability to project out the shard name for a document. For example,
db.employee.insert({_id: 1, name: "Joe Smith"})
db.employee.insert({_id: 2, name: "Mary Scott"})
db.employee.insert({_id: 3, name: "Ann Power"})
db.employee.aggregate([{$addFields: {shardName: {$shardName: 1}}}])
{ "_id" : 1, "name" : "Joe Smith", "shardName" : "shard0" }
{ "_id" : 2, "name" : "Mary Scott", "shardName" : "shard0" }
{ "_id" : 3, "name" : "Ann Power", "shardName" : "shard1" }
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