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Operating System:
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> use test2 switched to db test2 > db.test.createIndex( { filename: 1 }, { unique: 1 } ); { "createdCollectionAutomatically" : true, "numIndexesBefore" : 1, "numIndexesAfter" : 2, "ok" : 1 } > db.test.insert( { filename: "test" } ); WriteResult({ "nInserted" : 1 }) > db.test.insert( { filename: "test" } ); WriteResult({ "nInserted" : 0, "writeError" : { "code" : 11000, "errmsg" : "E11000 duplicate key error dup key: { : \"test\" }" } })

(Tested with nightly mongodb-linux-x86_64-f5e67009ead674efb7cf16da2c1c462cc99424db-2014-10-30)
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> use test2 switched to db test2 > db.test.createIndex( { filename: 1 }, { unique: 1 } ); { "createdCollectionAutomatically" : true , "numIndexesBefore" : 1, "numIndexesAfter" : 2, "ok" : 1 } > db.test.insert( { filename: "test" } ); WriteResult({ "nInserted" : 1 }) > db.test.insert( { filename: "test" } ); WriteResult({ "nInserted" : 0, "writeError" : { "code" : 11000, "errmsg" : "E11000 duplicate key error dup key: { : \" test\ " }" } }) (Tested with nightly mongodb-linux-x86_64-f5e67009ead674efb7cf16da2c1c462cc99424db-2014-10-30)

In mmapv1, a duplicate key error looks like:

error message: Could not store file: %s:%d:%sE11000 duplicate key error index: phpunit.test_prefix.files.$filename_1%Sdup key: { : "test.txt" }

With heap1, it looks like:

error message: Could not store file: 127.0.0.1:30000: E11000 duplicate key error dup key: { : "test.txt" }

It does not include the database name, collection name, or key name.