Increase minimum mirror update interval from 15 to 30 minutes

ee/changelogs/unreleased/dm-mirror-min-delay-30-minutes.yml

+---
+title: Increase minimum mirror update interval from 15 to 30 minutes
+merge_request:
+author:
+type: other

ee/lib/gitlab/mirror.rb

@@ -5,12 +5,13 @@ module Gitlab
     PULL_CAPACITY_KEY = 'MIRROR_PULL_CAPACITY'.freeze
     JITTER = 1.minute
 
-    # TODO: Make MIN_DELAY configurable and MAX_RETRY adjust according to it
-    # ISSUE: https://gitlab.com/gitlab-org/gitlab-ee/issues/3885
+    # TODO: Dynamically determine mirror update interval based on total number
+    # of mirrors, average update time, and available concurrency.
+    # Issue: https://gitlab.com/gitlab-org/gitlab-ee/issues/5258
+    MIN_DELAY = 30.minutes
     # MAX RETRY value was calculated based on the triangular number with a 15 minutes factor
     # https://en.wikipedia.org/wiki/Triangular_number in order to make sure the mirror
     # gets retried for a full day before it becomes hard failed
-    MIN_DELAY = 15.minutes
     MAX_RETRY = 14
 
     class << self

ee/spec/lib/gitlab/mirror_spec.rb

@@ -193,7 +193,7 @@ describe Gitlab::Mirror do
 
   describe '#min_delay' do
     it 'returns min delay with some jitter' do
-      expect(described_class.min_delay).to be_within(1.minute).of(15.minutes)
+      expect(described_class.min_delay).to be_within(1.minute).of(30.minutes)
     end
   end
 end

ee/spec/models/project_mirror_data_spec.rb

@@ -50,12 +50,12 @@ describe ProjectMirrorData, type: :model do
 
     context 'when base delay is lower than mirror_max_delay' do
       before do
-        mirror_data.last_update_started_at = timestamp - 1.minute
+        mirror_data.last_update_started_at = timestamp - 2.minutes
       end
 
       context 'when retry count is 0' do
         it 'applies transition successfully' do
-          expect_next_execution_timestamp(mirror_data, timestamp + 26.minutes)
+          expect_next_execution_timestamp(mirror_data, timestamp + 52.minutes)
         end
       end
 
@@ -64,7 +64,7 @@ describe ProjectMirrorData, type: :model do
           mirror_data.retry_count = 2
           mirror_data.increment_retry_count
 
-          expect_next_execution_timestamp(mirror_data, timestamp + 78.minutes)
+          expect_next_execution_timestamp(mirror_data, timestamp + 156.minutes)
         end
       end
     end
@@ -78,7 +78,7 @@ describe ProjectMirrorData, type: :model do
 
       context 'when last_update_started_at is nil' do
         it 'applies transition successfully' do
-          expect_next_execution_timestamp(mirror_data, timestamp + 15.minutes + mirror_jitter)
+          expect_next_execution_timestamp(mirror_data, timestamp + 30.minutes + mirror_jitter)
         end
       end
 
@@ -89,7 +89,7 @@ describe ProjectMirrorData, type: :model do
 
         context 'when resetting retry count' do
           it 'applies transition successfully' do
-            expect_next_execution_timestamp(mirror_data, timestamp + 15.minutes + mirror_jitter)
+            expect_next_execution_timestamp(mirror_data, timestamp + 30.minutes + mirror_jitter)
           end
         end
 
@@ -98,7 +98,7 @@ describe ProjectMirrorData, type: :model do
             mirror_data.retry_count = 3
             mirror_data.increment_retry_count
 
-            expect_next_execution_timestamp(mirror_data, timestamp + 62.minutes)
+            expect_next_execution_timestamp(mirror_data, timestamp + 122.minutes)
           end
         end
       end