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Package delay-exponential-backoff-bundle
Short Description Exponential backoff to delay for Symfony2 bundle for PHP
License MIT
Homepage https://github.com/Avtonom/delay-exponential-backoff-bundle
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Informations about the package delay-exponential-backoff-bundle
Avtonom Exponential backoff to delay
Exponential backoff is an algorithm that uses feedback to multiplicatively decrease the rate of some process, in order to gradually find an acceptable rate.
Page bundle: https://github.com/Avtonom/delay-exponential-backoff-bundle
| attempt | microseconds | seconds | minutes | hours |
|---|---|---|---|---|
| 1 | 150000000 | 150 | 2.5 | 0.04 |
| 2 | 300000000 | 300 | 5 | 0.08 |
| 3 | 600000000 | 600 | 10 | 0.17 |
| 4 | 1200000000 | 1200 | 20 | 0.33 |
| 5 | 2400000000 | 2400 | 40 | 0.67 |
| 6 | 4800000000 | 4800 | 80 | 1.33 |
| 7 | 9600000000 | 9600 | 160 | 2.67 |
| 8 | 19200000000 | 19200 | 320 | 5.33 |
| 9 | 38400000000 | 38400 | 640 | 10.67 |
| 10 | 76800000000 | 76800 | 1280 | 21.33 |
| 11 | 153600000000 | 153600 | 2560 | 42.67 |
To Install
Run the following in your project root, assuming you have composer set up for your project
Switching ~1.1 for the most recent tag.
Add the bundle to app/AppKernel.php
Configuration options (parameters.yaml):
API
getDefaultOptions():
This method is static and returns an array with the default options:
cap: Max duration allowed (in microseconds). If backoff duration is greater than cap, cap is returned, default is1000000microseconds.maxAttempts: Number of attempts before thrown an Yriveiro\Backoff\BackoffException. Default is0, no limit.
halfDelay($attempt):
delay($attempt):
exponential($attempt):
This method use and exponential function E(attempt) = (2**attempt - 1) to calculate backoff time.
Parameters
attempt: incremental value that represents the current retry number.
equalJitter($attempt);
Exponential backoff has one disadvantage. In high concurrence, we can have multiples calls with the same backoff time due the time is highly bound to the current attempt, different calls could be in the same attempt.
To solve this we can add a jitter value to allow some randomization.
equalJitter uses the function: E(attempt) = min(((2**attempt - 1) / 2), random(0, ((2**attempt - 1) / 2))).
Parameters
attempt: incremental value that represents the current retry number.
fullJitter($attempt);
Full jitter behaves like equalJitter method, the main difference between them is the way in how the jitter value is calculated.
fullJitter uses the function: E(attempt) = min(random(0, (2**attempt - 1) / 2)).
Parameters
attempt: incremental value that represents the current retry number.
Usage
Read information https://habrahabr.ru/post/227225/
All versions of delay-exponential-backoff-bundle with dependencies
symfony/dependency-injection Version ~2.3|3.*
yriveiro/php-backoff Version ~0.0