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I knew something was funny with Mongo when all the api calls defaulted to writes not being guaranteed to sync to disk. Maybe for a use case like aggregate statistics gathering it would be ok to risk missing a few updates in a crash for the sake of speed, but to make that the default??


Would you want to miss the most important post-recovery data: when your system is under duress?


You know this configuration change was changed in November 2012.

Do you think it's still relevant to be bringing this up ?


Actually, the defaults are still unsafe, just the marketing language has changed. Take the Node.js driver for example, it defaults to w=null and j=false. http://mongodb.github.io/node-mongodb-native/2.0/api/Db.html




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