Background migration to deduplicate LFS object projects
What does this MR do and why?
This MR adds a batched background migration to remove lfs_objects_projects duplicates by lfs_project_id, project_id and repository_type.
We need to add a unique index once the migration finishes, including these columns, to ensure data consistency since the unique validation already exists at the model level.
Related to #199909 (closed)
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Screenshots
| Description | Screenshot |
|---|---|
Duplicates lfs_objects_projects - |
 |
After bundle exec rake db:migrate
|
 |
batched_background_migration_jobs table after migration (affected rows 5) |
 |
Migrations
bundle exec rake db:migrate
$ scripts/db_tasks db:migrate
Running: `bundle exec rake db:migrate`
main: == [advisory_lock_connection] object_id: 114680, pg_backend_pid: 128
main: == 20240708180350 QueueDeduplicateLfsObjectsProjects: migrating ===============
main: == 20240708180350 QueueDeduplicateLfsObjectsProjects: migrated (0.0981s) ======
main: == [advisory_lock_connection] object_id: 114680, pg_backend_pid: 128
bundle exec rake db:migrate:down VERSION=20240610021223
$ scripts/db_tasks db:migrate:down VERSION=20240708180350
Running: `bundle exec rake db:migrate:down VERSION=20240708180350`
main: == [advisory_lock_connection] object_id: 114820, pg_backend_pid: 108
main: == 20240708180350 QueueDeduplicateLfsObjectsProjects: reverting ===============
main: == 20240708180350 QueueDeduplicateLfsObjectsProjects: reverted (0.0598s) ======
main: == [advisory_lock_connection] object_id: 114820, pg_backend_pid: 108Database lab
Queries
1. Duplicated value finder
Query plan: https://console.postgres.ai/gitlab/gitlab-production-main/sessions/29672/commands/92122
WITH "distinct_values" AS MATERIALIZED (
SELECT DISTINCT
"lfs_objects_projects"."project_id",
"lfs_objects_projects"."lfs_object_id"
FROM
"lfs_objects_projects"
WHERE
"lfs_objects_projects"."id" >= 481386
AND "lfs_objects_projects"."id" < 491386
)
SELECT
"project_id",
"lfs_object_id"
FROM
"distinct_values" AS "lfs_objects_projects"
WHERE ((
SELECT
COUNT(*) AS count
FROM (
SELECT
1
FROM
lfs_objects_projects lop
WHERE (lop.project_id = lfs_objects_projects.project_id)
AND (lop.lfs_object_id = lfs_objects_projects.lfs_object_id)
LIMIT 2) cnt) = 2)2. Dedup query
Query plan: https://console.postgres.ai/gitlab/gitlab-production-main/sessions/29672/commands/92124
SQL query
DELETE FROM "lfs_objects_projects"
WHERE "lfs_objects_projects"."id" IN (
SELECT
"lfs_objects_projects"."id"
FROM
"lfs_objects_projects"
INNER JOIN (
SELECT
project_id,
lfs_object_id,
repository_type,
MAX(id) AS max_id
FROM
"lfs_objects_projects"
WHERE ((project_id, lfs_object_id) IN (
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(1274100, 452087),
(1274100, 452007),
(1274100, 449304),
(1274100, 451044),
(1274100, 451029),
(1274100, 450490),
(1274100, 448774),
(1274100, 450965),
(1274100, 451565),
(1274100, 448926),
(1274100, 450604),
(1274100, 452013),
(1274100, 450220),
(1274100, 450158),
(1274100, 453337),
(1274100, 451510)))
GROUP BY
project_id,
lfs_object_id,
repository_type
HAVING (COUNT(*) > 1)) AS duplicates ON lfs_objects_projects.project_id = duplicates.project_id
AND lfs_objects_projects.lfs_object_id = duplicates.lfs_object_id
AND lfs_objects_projects.repository_type = duplicates.repository_type
WHERE
NOT (lfs_objects_projects.id = duplicates.max_id))Old approach with JOIN query
1. Join query
Query plan: https://console.postgres.ai/gitlab/gitlab-production-main/sessions/29416/commands/91438
EXPLAIN SELECT
"lfs_objects_projects".*
FROM
"lfs_objects_projects"
INNER JOIN (
SELECT
lfs_object_id,
project_id,
repository_type,
MAX(id) AS max_id
FROM
"lfs_objects_projects"
WHERE
"lfs_objects_projects"."project_id" IN (16, 20, 72, 1013, 2652, 2867, 4449, 5743, 5818, 7264, 7764, 9360, 13083, 13764, 13767, 16648, 18497, 18498, 18499, 18500, 18501, 18502, 18503, 18504, 18505, 18506, 18507, 18508, 18509, 18510, 18511, 18512, 18513, 18514, 18515, 18516, 18517, 18518, 18519, 18520, 18521, 18522, 18523, 18524, 18525, 18526, 18527, 18528, 18529, 18530, 18532, 18533, 18534, 18535, 18536, 18537, 18538, 18539, 18540, 18541, 18542, 18543, 18544, 18545, 18546, 18547, 18548, 18549, 18550, 18551, 20699, 23403, 29286, 32401, 32806, 33463, 33475, 36568, 36569, 36571, 38069, 39707, 40264, 63904, 78283, 78285, 78286, 95281, 146313, 163275, 163396, 163398, 309823, 353096, 387896, 691639, 695082, 952703, 1065383, 1118812, 1875244, 2206408, 2230440, 2255957, 2337675, 2751917, 2751922, 3333912, 3334373, 3334381, 3344948, 3800434, 4354685, 4354686, 4354688, 4354689, 4354691, 4409640, 4441689, 4542834, 4549417, 5630882, 5630887, 6118128, 6530427, 7434094, 9424406, 10415674, 11026233, 11026418, 11026537, 15059472, 16382505, 17566686, 17631786, 17632366, 17845429, 17930014, 21504640, 21531594, 22646620, 23285169, 29270005, 31279336, 41404100, 56337667, 56337723, 126696, 306410, 306426, 306446, 307034, 307893, 308028, 308089, 308097, 309623, 310621, 339289, 1, 297, 13787, 13802, 20458, 31759, 163475, 478692, 581461, 592104, 881609, 897750, 958540, 976977, 4152332, 4189054, 4206070, 5465839, 8120453, 8514576, 8577489, 8594287, 19244005, 21861275, 24299934, 599597, 730326, 730328, 744732, 745025, 748274, 755576, 757516, 1572597, 1572749, 2303288, 3375587, 20067313, 12, 2222936, 17844770, 17844796, 21251551, 427683, 427691, 464552, 551152, 580687, 662460, 680750, 773595, 994459, 1384129, 2137286, 3517087, 4252049, 4834649, 4977479, 5030944, 5216190, 5356625, 6008489, 7991166, 8728867, 8899630, 9164879, 13098716, 13098717, 16654078, 44835, 1446864, 2207032, 2825429, 2898689, 5803973, 6110635, 3, 4809264, 5028005, 23657708, 32450472, 324, 325, 19, 15, 25, 32, 33, 860995, 1235357, 1617647, 1647970, 2036871, 2368403, 7163302, 7372856, 8196479, 10635432, 10740940, 10775635, 11265703, 11923292, 12609050, 17314228, 17496513, 19350196, 24125594, 30710980, 11, 8941946, 19353091, 19353189, 41924938, 2168985, 7757775, 7758099, 7758104, 7758107, 7758108, 7758109, 7758110, 7925235, 8076263, 8700624, 10573981, 15705061, 14, 44920238, 56044502, 13, 1615389, 2324884, 22, 430, 83744, 1779106, 1807910, 1820646, 1888938, 1888940, 1938817, 5141145, 7110480, 7912628, 10701829, 11046052, 12467909, 19058014, 19992269, 22009461, 23336966, 8, 10832194, 5759482, 10, 1023513, 1023520, 4314342, 4751853, 5092858, 8053697, 8840060, 9480350, 9503413, 20884, 7, 11629851, 1191, 1365, 1844, 1850, 2732, 7667, 17744, 22985, 30776, 36743, 39984, 45169, 99945, 169765, 173142, 174024, 182309, 192795, 198120, 200149, 200980, 201378, 205896, 245362, 270497, 280425, 281857, 282144, 282211, 305463, 332909, 465390, 484997, 505199, 629060, 639908, 645380, 651742, 841782, 899615, 934896, 1265999, 1409446, 1409902, 1612960, 2063685, 2682421, 3128568, 3625877, 3662568, 3684185, 3787208, 3828396, 3991945, 4053197, 4359271, 4467622, 4492386, 4737966, 4899189, 4949400, 5064907, 5109694, 5191294, 5382660, 5899899, 6335481, 6374580, 6374588, 6374596, 7628274, 7686095, 7745145, 8223987, 8259605, 9655255, 10702458, 11060863, 11376680, 11392672, 11569466, 11569554, 13780298, 13831684, 14231319, 14574604, 15113443, 15126989, 16088759, 16152857, 16607739, 17373998, 17771506, 18889967, 18897919, 19047934, 20095954, 21005471, 21878261, 23582114, 24528529, 25651766, 25683483, 26735010, 26770092, 26888837, 26906858, 27996746, 31279611, 34770409, 38256317, 44378497, 44940243, 48336847, 53027300, 24, 246, 298, 29, 31, 3015276, 3119046, 3935880, 36800235, 36827361, 34, 35, 908052, 908053, 908054, 908055, 908056, 908057, 908058, 908059, 908060, 908061, 908062, 908063, 908064, 908065, 908069, 908070, 908072, 908074, 908075, 908076, 908077, 908079, 908080, 908081, 908082, 908083, 908084, 908085, 908086, 38, 37, 58525632, 58569926, 58682239, 39, 7045398, 14550145, 14748140, 14748180, 14748199, 18199014, 833935, 833936, 833943, 833944, 833945, 833946)
GROUP BY
lfs_object_id,
project_id,
repository_type
HAVING (COUNT(*) > 1)) AS duplicates ON lfs_objects_projects.project_id = duplicates.project_id
AND lfs_objects_projects.lfs_object_id = duplicates.lfs_object_id
AND lfs_objects_projects.repository_type = duplicates.repository_type
WHERE
NOT (lfs_objects_projects.id = duplicates.max_id);2. Delete all
Query plan: https://console.postgres.ai/gitlab/gitlab-production-main/sessions/29416/commands/91439
EXPLAIN DELETE FROM "lfs_objects_projects"
WHERE "lfs_objects_projects"."id" IN (
SELECT
"lfs_objects_projects"."id"
FROM
"lfs_objects_projects"
INNER JOIN (
SELECT
lfs_object_id,
project_id,
repository_type,
MAX(id) AS max_id
FROM
"lfs_objects_projects"
WHERE
"lfs_objects_projects"."project_id" IN (16, 20, 72, 1013, 2652, 2867, 4449, 5743, 5818, 7264, 7764, 9360, 13083, 13764, 13767, 16648, 18497, 18498, 18499, 18500, 18501, 18502, 18503, 18504, 18505, 18506, 18507, 18508, 18509, 18510, 18511, 18512, 18513, 18514, 18515, 18516, 18517, 18518, 18519, 18520, 18521, 18522, 18523, 18524, 18525, 18526, 18527, 18528, 18529, 18530, 18532, 18533, 18534, 18535, 18536, 18537, 18538, 18539, 18540, 18541, 18542, 18543, 18544, 18545, 18546, 18547, 18548, 18549, 18550, 18551, 20699, 23403, 29286, 32401, 32806, 33463, 33475, 36568, 36569, 36571, 38069, 39707, 40264, 63904, 78283, 78285, 78286, 95281, 146313, 163275, 163396, 163398, 309823, 353096, 387896, 691639, 695082, 952703, 1065383, 1118812, 1875244, 2206408, 2230440, 2255957, 2337675, 2751917, 2751922, 3333912, 3334373, 3334381, 3344948, 3800434, 4354685, 4354686, 4354688, 4354689, 4354691, 4409640, 4441689, 4542834, 4549417, 5630882, 5630887, 6118128, 6530427, 7434094, 9424406, 10415674, 11026233, 11026418, 11026537, 15059472, 16382505, 17566686, 17631786, 17632366, 17845429, 17930014, 21504640, 21531594, 22646620, 23285169, 29270005, 31279336, 41404100, 56337667, 56337723, 126696, 306410, 306426, 306446, 307034, 307893, 308028, 308089, 308097, 309623, 310621, 339289, 1, 297, 13787, 13802, 20458, 31759, 163475, 478692, 581461, 592104, 881609, 897750, 958540, 976977, 4152332, 4189054, 4206070, 5465839, 8120453, 8514576, 8577489, 8594287, 19244005, 21861275, 24299934, 599597, 730326, 730328, 744732, 745025, 748274, 755576, 757516, 1572597, 1572749, 2303288, 3375587, 20067313, 12, 2222936, 17844770, 17844796, 21251551, 427683, 427691, 464552, 551152, 580687, 662460, 680750, 773595, 994459, 1384129, 2137286, 3517087, 4252049, 4834649, 4977479, 5030944, 5216190, 5356625, 6008489, 7991166, 8728867, 8899630, 9164879, 13098716, 13098717, 16654078, 44835, 1446864, 2207032, 2825429, 2898689, 5803973, 6110635, 3, 4809264, 5028005, 23657708, 32450472, 324, 325, 19, 15, 25, 32, 33, 860995, 1235357, 1617647, 1647970, 2036871, 2368403, 7163302, 7372856, 8196479, 10635432, 10740940, 10775635, 11265703, 11923292, 12609050, 17314228, 17496513, 19350196, 24125594, 30710980, 11, 8941946, 19353091, 19353189, 41924938, 2168985, 7757775, 7758099, 7758104, 7758107, 7758108, 7758109, 7758110, 7925235, 8076263, 8700624, 10573981, 15705061, 14, 44920238, 56044502, 13, 1615389, 2324884, 22, 430, 83744, 1779106, 1807910, 1820646, 1888938, 1888940, 1938817, 5141145, 7110480, 7912628, 10701829, 11046052, 12467909, 19058014, 19992269, 22009461, 23336966, 8, 10832194, 5759482, 10, 1023513, 1023520, 4314342, 4751853, 5092858, 8053697, 8840060, 9480350, 9503413, 20884, 7, 11629851, 1191, 1365, 1844, 1850, 2732, 7667, 17744, 22985, 30776, 36743, 39984, 45169, 99945, 169765, 173142, 174024, 182309, 192795, 198120, 200149, 200980, 201378, 205896, 245362, 270497, 280425, 281857, 282144, 282211, 305463, 332909, 465390, 484997, 505199, 629060, 639908, 645380, 651742, 841782, 899615, 934896, 1265999, 1409446, 1409902, 1612960, 2063685, 2682421, 3128568, 3625877, 3662568, 3684185, 3787208, 3828396, 3991945, 4053197, 4359271, 4467622, 4492386, 4737966, 4899189, 4949400, 5064907, 5109694, 5191294, 5382660, 5899899, 6335481, 6374580, 6374588, 6374596, 7628274, 7686095, 7745145, 8223987, 8259605, 9655255, 10702458, 11060863, 11376680, 11392672, 11569466, 11569554, 13780298, 13831684, 14231319, 14574604, 15113443, 15126989, 16088759, 16152857, 16607739, 17373998, 17771506, 18889967, 18897919, 19047934, 20095954, 21005471, 21878261, 23582114, 24528529, 25651766, 25683483, 26735010, 26770092, 26888837, 26906858, 27996746, 31279611, 34770409, 38256317, 44378497, 44940243, 48336847, 53027300, 24, 246, 298, 29, 31, 3015276, 3119046, 3935880, 36800235, 36827361, 34, 35, 908052, 908053, 908054, 908055, 908056, 908057, 908058, 908059, 908060, 908061, 908062, 908063, 908064, 908065, 908069, 908070, 908072, 908074, 908075, 908076, 908077, 908079, 908080, 908081, 908082, 908083, 908084, 908085, 908086, 38, 37, 58525632, 58569926, 58682239, 39, 7045398, 14550145, 14748140, 14748180, 14748199, 18199014, 833935, 833936, 833943, 833944, 833945, 833946)
GROUP BY
lfs_object_id,
project_id,
repository_type
HAVING (COUNT(*) > 1)) AS duplicates ON lfs_objects_projects.project_id = duplicates.project_id
AND lfs_objects_projects.lfs_object_id = duplicates.lfs_object_id
AND lfs_objects_projects.repository_type = duplicates.repository_type
WHERE
NOT (lfs_objects_projects.id = duplicates.max_id));Edited by Javiera Tapia