disagg: limit S3 read amplification on compute nodes (#10771)#10790

Merged

ti-chi-bot[bot] merged 37 commits intopingcap:release-nextgen-202603from

ti-chi-bot:cherry-pick-10771-to-release-nextgen-202603

Apr 8, 2026

Commits on Apr 8, 2026

disagg: add configurable node-level S3 read limiter

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disagg: throttle S3 readers and deduplicate cache misses

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Refine metrics and comments

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disagg: add remote cache phase-2 metrics and coverage

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disagg: remove duplicate S3 active stream metric

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disagg: share file cache wait implementation

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disagg: clarify file cache get paths

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disagg: handle failed bounded wait downloads

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disagg: reuse copyData in limited cache downloads

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disagg: clarify conservative S3 read charging

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disagg: share S3 random access read and seek tails

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disagg: extend S3 read limiter unit coverage

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Refine metrics

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disagg: enrich file cache observability

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disagg: remove S3 stream cap support

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docs: add English disagg S3 backpressure design

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disagg: clarify shared limiter test semantics

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disagg: keep S3 limiter object across disable reload

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disagg: address review follow-up fixes

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disagg: avoid large-request stalls in S3 limiter

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Format codes

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disagg: decouple S3 read accounting from throttling

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disagg: add mark and minmax cache eviction APIs

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Remove unnecessary design doc

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disagg: address cache eviction and filecache review notes

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Update grafana panel

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disagg: tighten filecache startup and low-limit reads

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disagg: fix failed download cache accounting

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Update grafana panel

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Update grafana panel

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disagg: refine filecache failure cleanup metrics

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disagg: restore S3 fast paths and scope bg download failure

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disagg: restore disabled-limiter seek fast path

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disagg: clean up failed file cache scheduling

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disagg: clarify S3 limiter semantics and harden tests

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disagg: avoid pool access during file cache shutdown

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tests: support overriding HUB_ADDR/PD_IMAGE/TIKV_IMAGE/TIDB_IMAGE via env vars in next-gen fullstack test
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