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[v25.3.x] storage: Avoid oversized alloc in compaction reducers#30218

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StephanDollberg merged 1 commit intov25.3.xfrom
manual-backport-30210-v25.3.x-302
Apr 20, 2026
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[v25.3.x] storage: Avoid oversized alloc in compaction reducers#30218
StephanDollberg merged 1 commit intov25.3.xfrom
manual-backport-30210-v25.3.x-302

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Backport of PR #30210

Store offset deltas in chunked_vector to avoid oversized allocs with too
many deltas or records per batch.

(cherry picked from commit 4094d2a)
@StephanDollberg StephanDollberg added this to the v25.3.x-next milestone Apr 17, 2026
@StephanDollberg StephanDollberg added the kind/backport PRs targeting a stable branch label Apr 17, 2026
@StephanDollberg StephanDollberg marked this pull request as ready for review April 17, 2026 16:43
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CI test results

test results on build#83331
test_status test_class test_method test_arguments test_kind job_url passed reason test_history
FAIL raft_fixture leadership_transfer_delay unit https://buildkite.com/redpanda/redpanda/builds/83331#019d9c54-0e7c-482c-8dad-363f66327d91 0/1
FLAKY(PASS) ShadowLinkConsumeGroupsMirroringTest test_continuous_group_sync {"source_cluster_spec": {"cluster_type": "redpanda"}, "with_failures": true} integration https://buildkite.com/redpanda/redpanda/builds/83331#019d9c72-f2e0-4a75-974c-ee011aea0ab9 10/11 Test PASSES after retries.No significant increase in flaky rate(baseline=0.0000, p0=1.0000, reject_threshold=0.0100. adj_baseline=0.1000, p1=0.3487, trust_threshold=0.5000) https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=ShadowLinkConsumeGroupsMirroringTest&test_method=test_continuous_group_sync

@StephanDollberg StephanDollberg merged commit 7e93304 into v25.3.x Apr 20, 2026
19 checks passed
@StephanDollberg StephanDollberg deleted the manual-backport-30210-v25.3.x-302 branch April 20, 2026 08:52
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