Ravi Sir's Cards › AWS
Shard writes
This revision card explains Shard writes. It starts from the need that one DeviceId PK throttles under burst. It describes PK=DEVICE#id#shard; SK=epochMs; raise shards on throttle. The how-to section notes pick shard count , then Put across shards , then Query window , then watch throttle. An example on the card is ananya Iyer starts at 4 shards and scales with metrics.
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What this card says
Why do we need it?
One DeviceId PK throttles under burst.
What is it?
PK=DEVICE#id#shard; SK=epochMs; raise shards on throttle.
write sharding
How to do it
Pick shard count → Put across shards → Query window → watch throttle.
Example
Ananya Iyer starts at 4 shards and scales with metrics.