It loses data even with WriteConcern.MAJORITY[1]. Emin Gün Sirer summarized[2] it best: > WriteConcern is at least well-named: it corresponds to "how concerne

It loses data even with WriteConcern.MAJORITY[1]. Emin Gün Sirer summarized[2] it best: > WriteConcern is at least well-named: it corresponds to "how concerned would you be if we lost your data?" and the potential answers are "not at all!", "be my guest", and "well, look like you made an effort, but it's ok if you drop it." [1] https://aphyr.com/posts/284-call-me-maybe-mongodb https://aphyr.com/posts/284-call-me-maybe-mongodb [2] http://hackingdistributed.com/2013/01/29/mongo-ft/ http://hackingdistributed.com/2013/01/29/mongo-ft/