56 lines
1.5 KiB
Ruby
56 lines
1.5 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Ci
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class Trace
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##
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# Trace::Backoff class is responsible for calculating a backoff value
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# for when to be able to retry archiving a build's trace
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#
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# Because we're updating `last_archival_attempt_at` timestamp with every
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# failed archival attempt, we need to be sure that sum of the backoff values
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# for 1..MAX_ATTEMPTS is under 7 days(CHUNK_REDIS_TTL).
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#
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class Backoff
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include Gitlab::Utils::StrongMemoize
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MAX_JITTER_VALUE = 4
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attr_reader :archival_attempts
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def initialize(archival_attempts)
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@archival_attempts = archival_attempts
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end
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def value
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(((chunks_ttl / (3.5 * max_attempts)) * archival_attempts) / 1.hour).hours
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end
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# This formula generates an increasing delay between executions
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# 9.6, 19.2, 28.8, 38.4, 48.0 + a random amount of time to
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# change the order of execution for the jobs.
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# With maximum value for each call to rand(4), this sums up to 6.8 days
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# and with minimum values is 6 days.
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#
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def value_with_jitter
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value + jitter
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end
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private
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def jitter
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rand(MAX_JITTER_VALUE).hours
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end
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def chunks_ttl
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::Ci::BuildTraceChunks::RedisBase::CHUNK_REDIS_TTL
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end
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def max_attempts
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::Ci::BuildTraceMetadata::MAX_ATTEMPTS
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end
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end
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end
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end
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end
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