What to watch
Four shards carry 160 a second each. Push the hot key share to 0.8 and one shard alone is offered 320 against its own 160, so it pins and sheds while the utilisation meter, an average across all four, still looks comfortable.What it is made of
Under load
Measured by running this design through the simulator at multiples of its own offered rate of 400 requests a second. Twenty seconds of simulated time, one fixed seed, so the same numbers come out every time.This design holds 600 requests a second with 0% errors. At 800 it is losing 14% of them.
Open this example
Load Sharded database from the Examples menu and drag the traffic slider yourself.