mysql.insert({user: user, postTitle: postTitle, postBody: postBody}, function(err, result) {
  if(err) { return Error(500); }
  redis.incr({user: user, totalPostCount}, function(err, result) {
    if(err) { mysql.delete???}
    setLast10Post({newPost: {postTitle...}}, function(err, result) {
      if(err) {mysql.delete; redis.decr????}
    })
  })