vshard.router.call

vshard.router.call(100,
                   'write',
                   'customer_add',
                   {{customer_id = 2, bucket_id = 100, name = 'name2', accounts = {}}},
                   {timeout = 5})

memtx_min_tuple_size = 8,
slab_alloc_factor = 2,

local to_call = {}
for row in pairs(mydata) do
  local bucket = calc_my_bucket_id(row)
  to_call[bucket] = to_call[bucket] or {}
  table.insert(to_call[bucket], row)
end

for bucket,rows in pairs(to_call) do
  vshard.router.call(bucket,'write','customer_add', {rows})
end