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@yoshi-taka

boto3：retryのアルゴリズム実装memo

Posted at

botocore/botocore/retryhandler.py

boto3の指数バックオフ + jitterは以下の式
base * growth_factor ^ (attempts - 1)

  • baseはrand()なので、0-1の間。リトライ実行ごとにシャッフルされる
  • DynamoDBだけbaseが0.05固定 botocore/botocore/data/_retry.jsonより
  • growth_factorは初期値2

リトライ初回はattempts=1よりbaseとなり、一瞬待つことになる。
rand()が0に近いとほぼ待たずにリトライすることがある。

実装の疑問
https://github.com/boto/botocore/issues/1471

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