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FIX: properly count DistributedMutex locking attempts

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When originally introduced, `attempts` was only used in the read-only check
context.

With the introduction of the exponential backoff in cda370db, `attempts` was
also used to count loop iterations, but was left inside the if block instead of
being incremented every loop, meaning the exponential backoff was only
happening when the site was recently readonly.

Co-authored-by: jbrw <jamie.wilson@discourse.org>
This commit is contained in:
Michael Brown 2022-12-13 17:09:01 -05:00 committed by Michael Brown
parent 2b9fa41a6e
commit 618fb5b34d
1 changed files with 3 additions and 6 deletions
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9
lib/distributed_mutex.rb
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@ -88,14 +88,11 @@ class DistributedMutex
# Exponential backoff, max duration 1s
interval = attempts < 10 ? (0.001 * 2**attempts) : 1
sleep interval
attempts += 1
# in readonly we will never be able to get a lock
if @using_global_redis && Discourse.recently_readonly?
attempts += 1
if attempts > CHECK_READONLY_ATTEMPTS
raise Discourse::ReadOnly
end
if @using_global_redis && Discourse.recently_readonly? && attempts > CHECK_READONLY_ATTEMPTS
raise Discourse::ReadOnly
end
end
end