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OOPS-e35685f694a2d3e2a03d3a9c3598c04b. EXPLAIN (ANALYZE, BUFFERS) of
the slow query says:
Sort (cost=22784.36..22784.36 rows=2 width=864) (actual
time=8487.022..8487.023 rows=7 loops=1)
Sort Key: branchmergeproposal.date_created DESC, branchmergeproposal.id
Sort Method: quicksort Memory: 31kB
Buffers: shared hit=1636424
-> Unique (cost=22784.18..22784.33 rows=2 width=864) (actual
time=8486.988..8487.009 rows=7 loops=1)
Buffers: shared hit=1636424
-> Sort (cost=22784.18..22784.18 rows=2 width=864) (actual
time=8486.987..8486.987 rows=7 loops=1)
Sort Key: branchmergeproposal.commit_message,
branchmergeproposal.date_created, branchmergeproposal.date_merged,
branchmergeproposal.date_review_requested, branchmergeproposal.date_reviewed,
branchmergeproposal.description, branchmergeproposal.id,
branchmergeproposal.merge_reporter, branchmergeproposal.merged_revision_id,
branchmergeproposal.merged_revno, branchmergeproposal.dependent_branch,
branchmergeproposal.dependent_git_commit_sha1,
branchmergeproposal.dependent_git_path,
branchmergeproposal.dependent_git_repository, branchmergeproposal.queue_status,
branchmergeproposal.registrant, branchmergeproposal.reviewed_revision_id,
branchmergeproposal.reviewer, branchmergeproposal.root_message_id,
branchmergeproposal.source_branch, branchmergeproposal.source_git_commit_sha1,
branchmergeproposal.source_git_path, branchmergeproposal.source_git_repository,
branchmergeproposal.superseded_by, branchmergeproposal.target_branch,
branchmergeproposal.target_git_commit_sha1,
branchmergeproposal.target_git_path, branchmergeproposal.target_git_repository,
branchmergeproposal.whiteboard
Sort Method: quicksort Memory: 31kB
Buffers: shared hit=1636424
-> Append (cost=636.84..22784.17 rows=2 width=864) (actual
time=8486.947..8486.950 rows=7 loops=1)
Buffers: shared hit=1636424
-> Sort (cost=636.84..636.85 rows=1 width=944) (actual
time=59.592..59.592 rows=0 loops=1)
Sort Key: branchmergeproposal.date_created DESC,
branchmergeproposal.id
Sort Method: quicksort Memory: 25kB
Buffers: shared hit=44221
CTE candidate_branches
-> Nested Loop (cost=26.63..356.32 rows=69
width=4) (actual time=0.036..17.506 rows=8557 loops=1)
Buffers: shared hit=10099
InitPlan 4 (returns $5)
-> Aggregate (cost=4.25..4.26 rows=1
width=32) (actual time=0.072..0.072 rows=1 loops=1)
Buffers: shared hit=35
-> Index Scan using
teamparticipation_person_idx on teamparticipation teamparticipation_2
(cost=0.43..4.24 rows=2 width=4) (actual time=0.013..0.052 rows=42 loops=1)
Index Cond: (person = 862235)
Buffers: shared hit=35
InitPlan 5 (returns $7)
-> Aggregate (cost=21.65..21.66 rows=1
width=32) (actual time=1.749..1.749 rows=1 loops=1)
Buffers: shared hit=1461
-> Nested Loop (cost=0.85..21.64
rows=1 width=4) (actual time=0.024..1.432 rows=1931 loops=1)
Buffers: shared hit=1461
-> Index Scan using
teamparticipation_person_idx on teamparticipation teamparticipation_3
(cost=0.43..4.24 rows=2 width=4) (actual time=0.008..0.031 rows=42 loops=1)
Index Cond: (person =
862235)
Buffers: shared hit=35
-> Index Only Scan using
accesspolicygrant__grantee__policy__key on accesspolicygrant
accesspolicygrant_1 (cost=0.42..8.66 rows=4 width=8) (actual time=0.004..0.027
rows=46 loops=42)
Index Cond: (grantee =
teamparticipation_3.team)
Heap Fetches: 1931
Buffers: shared hit=1426
-> Index Scan using product_project_idx on
product product_1 (cost=0.29..9.36 rows=4 width=4) (actual time=0.016..0.018
rows=3 loops=1)
Index Cond: (project = 698)
Buffers: shared hit=5
-> Index Scan using
branch__product__owner__name__key on branch (cost=0.42..79.82 rows=44 width=8)
(actual time=0.009..5.432 rows=2852 loops=3)
Index Cond: (product = product_1.id)
Filter: ((information_type = ANY
('{1,2}'::integer[])) OR COALESCE((access_grants && $5), false) OR
COALESCE((ARRAY[access_policy] && $7), false))
Buffers: shared hit=10094
-> Hash Semi Join (cost=4.22..280.52 rows=1
width=944) (actual time=59.586..59.586 rows=0 loops=1)
Hash Cond: (branchmergeproposal.target_branch
= candidate_branches_1.id)
Buffers: shared hit=44221
-> Nested Loop (cost=1.98..278.27 rows=3
width=944) (actual time=37.029..37.029 rows=0 loops=1)
Buffers: shared hit=34122
-> HashAggregate (cost=1.55..2.24
rows=69 width=4) (actual time=3.878..6.003 rows=8557 loops=1)
Group Key: candidate_branches.id
-> CTE Scan on candidate_branches
(cost=0.00..1.38 rows=69 width=4) (actual time=0.001..0.807 rows=8557 loops=1)
-> Index Scan using
branchmergeproposal__source_branch__idx on branchmergeproposal
(cost=0.42..3.99 rows=1 width=944) (actual time=0.003..0.003 rows=0 loops=8557)
Index Cond: (source_branch =
candidate_branches.id)
Filter: (queue_status = ANY
('{3,2}'::integer[]))
Rows Removed by Filter: 1
Buffers: shared hit=34122
-> Hash (cost=1.38..1.38 rows=69 width=4)
(actual time=22.543..22.543 rows=8557 loops=1)
Buckets: 16384 (originally 1024)
Batches: 1 (originally 1) Memory Usage: 429kB
Buffers: shared hit=10099
-> CTE Scan on candidate_branches
candidate_branches_1 (cost=0.00..1.38 rows=69 width=4) (actual
time=0.038..20.592 rows=8557 loops=1)
Buffers: shared hit=10099
-> Sort (cost=22147.29..22147.30 rows=1 width=944)
(actual time=8427.353..8427.354 rows=7 loops=1)
Sort Key: branchmergeproposal_1.date_created DESC,
branchmergeproposal_1.id
Sort Method: quicksort Memory: 31kB
Buffers: shared hit=1592203
CTE candidate_repositories
-> Nested Loop (cost=28.33..78.49 rows=1
width=4) (actual time=0.040..2.588 rows=89 loops=1)
Buffers: shared hit=1595
InitPlan 1 (returns $0)
-> Aggregate (cost=4.25..4.26 rows=1
width=32) (actual time=0.063..0.063 rows=1 loops=1)
Buffers: shared hit=35
-> Index Scan using
teamparticipation_person_idx on teamparticipation (cost=0.43..4.24 rows=2
width=4) (actual time=0.013..0.049 rows=42 loops=1)
Index Cond: (person = 862235)
Buffers: shared hit=35
InitPlan 2 (returns $2)
-> Aggregate (cost=21.65..21.66 rows=1
width=32) (actual time=1.745..1.745 rows=1 loops=1)
Buffers: shared hit=1461
-> Nested Loop (cost=0.85..21.64
rows=1 width=4) (actual time=0.016..1.444 rows=1931 loops=1)
Buffers: shared hit=1461
-> Index Scan using
teamparticipation_person_idx on teamparticipation teamparticipation_1
(cost=0.43..4.24 rows=2 width=4) (actual time=0.006..0.029 rows=42 loops=1)
Index Cond: (person =
862235)
Buffers: shared hit=35
-> Index Only Scan using
accesspolicygrant__grantee__policy__key on accesspolicygrant (cost=0.42..8.66
rows=4 width=8) (actual time=0.003..0.027 rows=46 loops=42)
Index Cond: (grantee =
teamparticipation_1.team)
Heap Fetches: 1931
Buffers: shared hit=1426
-> Index Scan using product_project_idx on
product (cost=0.29..9.36 rows=4 width=4) (actual time=0.008..0.011 rows=3
loops=1)
Index Cond: (project = 698)
Buffers: shared hit=5
-> Bitmap Heap Scan on gitrepository
(cost=2.12..10.77 rows=4 width=8) (actual time=0.022..0.850 rows=30 loops=3)
Recheck Cond: (project = product.id)
Filter: ((information_type = ANY
('{1,2}'::integer[])) OR COALESCE((access_grants && $0), false) OR
COALESCE((ARRAY[access_policy] && $2), false))
Heap Blocks: exact=87
Buffers: shared hit=1590
-> Bitmap Index Scan on
gitrepository__project__id__idx (cost=0.00..2.12 rows=5 width=0) (actual
time=0.008..0.008 rows=30 loops=3)
Index Cond: (project =
product.id)
Buffers: shared hit=7
-> Nested Loop Semi Join (cost=0.02..22068.79
rows=1 width=944) (actual time=1528.623..8427.311 rows=7 loops=1)
Join Filter:
(branchmergeproposal_1.target_git_repository = candidate_repositories_1.id)
Rows Removed by Join Filter: 406
Buffers: shared hit=1592203
-> Nested Loop (cost=0.02..22068.76 rows=1
width=944) (actual time=1528.606..8427.197 rows=7 loops=1)
Join Filter:
(branchmergeproposal_1.source_git_repository = candidate_repositories.id)
Rows Removed by Join Filter: 1071286
Buffers: shared hit=1592203
-> HashAggregate (cost=0.02..0.03
rows=1 width=4) (actual time=2.670..2.956 rows=89 loops=1)
Group Key:
candidate_repositories.id
Buffers: shared hit=1595
-> CTE Scan on
candidate_repositories (cost=0.00..0.02 rows=1 width=4) (actual
time=0.043..2.624 rows=89 loops=1)
Buffers: shared hit=1595
-> Seq Scan on branchmergeproposal
branchmergeproposal_1 (cost=0.00..21917.71 rows=12081 width=944) (actual
time=0.033..92.441 rows=12037 loops=89)
Filter: (queue_status = ANY
('{3,2}'::integer[]))
Rows Removed by Filter: 311620
Buffers: shared hit=1590608
-> CTE Scan on candidate_repositories
candidate_repositories_1 (cost=0.00..0.02 rows=1 width=4) (actual
time=0.001..0.007 rows=59 loops=7)
Planning time: 12.965 ms
Execution time: 8487.565 ms
(118 rows)
This appears to be due to missing indexes on
BranchMergeProposal(*_git_repository).
** Affects: ubuntu
Importance: Critical
Assignee: martin (mukamuka)
Status: Fix Released
** Tags: code-review lp-code oops timeout
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/maas-project/+activereviews times out
https://bugs.launchpad.net/bugs/1847090
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