> db.adminCommand({'configureFailPoint': 'WTWriteConflictException', mode: { activationProbability: 0.25 }})
{ "ok" : 1 }
> db.dropDatabase(); db.fun_times.save({});  db.fun_times.find()
{ "_id" : ObjectId("54c96a1243296b6fd24cfc9b") }
> db.dropDatabase(); db.fun_times.save({});  db.fun_times.find()
{ "_id" : ObjectId("54c96a1243296b6fd24cfc9b") }
{ "_id" : ObjectId("54c96a1443296b6fd24cfc9c") }
> db.dropDatabase(); db.fun_times.save({});  db.fun_times.find()
{ "_id" : ObjectId("54c96a1243296b6fd24cfc9b") }
{ "_id" : ObjectId("54c96a1443296b6fd24cfc9c") }
{ "_id" : ObjectId("54c96a1443296b6fd24cfc9d") }
> db.dropDatabase(); db.fun_times.save({});  db.fun_times.find()
{ "_id" : ObjectId("54c96a1243296b6fd24cfc9b") }
{ "_id" : ObjectId("54c96a1443296b6fd24cfc9c") }
{ "_id" : ObjectId("54c96a1443296b6fd24cfc9d") }
{ "_id" : ObjectId("54c96a1543296b6fd24cfc9e") }