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Ran 23 Sep 2016 05:10AM UTC

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Committed 23 Sep 2016 05:05AM UTC coverage: 92.744% (+0.1%) from 92.641%

Job # PROFILE=netty-40

Build Type

Pull #365

travis-ci

Committed by

web-flow

Commit Message

Add jitter backoff strategies for spreading reconnection timing

When users use exponential backoff streategy and connection pool with more than thousands of application servers, sometimes connection bursting is occured in Redis instance.
Because it's reconnection timings are all same when Redis server is under slowlog or network problem.
This patch will fix the problem using well known jitter backoff strategies.

Equal Jitter

    sleep = random_between(0, min(cap, base * 2 ** attempt))

Full Jitter

    temp = min(cap, base * 2 ** attempt)
    sleep = temp / 2 + random_between(0, temp / 2)

Decorrelated Jitter

    sleep = min(cap, random_between(base, sleep * 3))

Rerenrence: https://www.awsarchitectureblog.com/2015/03/backoff.html

Pull Request Pull Request #365: Add jitter backoff strategies for spreading reconnection timing

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