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Archive for July, 2014

How to solve a “does not contain shard key for pattern” at a Mongo WriteConcernException

A few days ago I got stuck a bit longer than normally because of a WriteConcernException in MongoDB. Inside the exception I got the message : “does not contain shard key for pattern { _id: 1.0 }”. The id was in the query, but apparently not in the right place

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