fix(memory): 增加内存准入开关（默认关闭），修复容器内存识别与正文额度过量占用 - #1497
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Memory admission (introduced in v0.9.6) now follows the system setting enableMemoryAdmission, which defaults to off. When off, the governor only accounts leases and never refuses or queues them, workers do not request credits from the primary, request bodies and stream gate prefixes stay in memory without spilling to disk, the STREAM_GATE_GLOBAL_PREBUFFER_BYTE_CAP sub-limit and the pre-materialization heap check are skipped, and no local 429 local_capacity_exceeded is produced. When on, every existing admission mechanism applies unchanged. The proxy handler reads cached system settings before reading the inbound body and syncs the switch into the process governor; saving the setting invalidates the cache across processes as usual. - schema: system_settings.enable_memory_admission boolean not null default false (migration 0124) - settings page: toggle next to high-concurrency mode, i18n for 5 locales - v1 API/OpenAPI, server action, legacy admin route, validation, cache defaults, column downgrade ladder Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthrough新增默认关闭的系统内存准入设置，并接入管理界面、设置存储和代理请求流程。启用时，内存治理器按额度管理租约、正文存储和流式预缓冲；关闭时，不执行相应的额度限制。请求正文解析后，租约按估算的持续持有量调整；资源快照会扣除可回收的 cgroup 文件缓存。 Changes内存准入设置与系统设置流程
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Suggested reviewers: Merge Risk: 🟡 Moderate · up to Saving the setting on an older database may appear to succeed without taking effect, and requests already waiting for memory credits may still receive a local capacity error after admission is disabled. Resolve these paths before merging. Security Architecture ReviewSecurity architecture risk: 🟠 High · up to Default behavior now allows proxy requests to retain memory without the admission limits that protected the current deployment. Enabling those limits can also be unreliable during a settings-read failure or a deployment where the database migration has not completed. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 24 functions across 41 files. (1 skipped: 1 unsupported.)
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/lib/config/system-settings-cache.ts:
- Line 268: 仅当 settings 对象仍是当前缓存对象时，才更新内存准入状态。调整读取缓存设置并调用
getMemoryGovernor().setEnabled 的逻辑，使用 getCachedSystemSettingsOnlyCache()
与返回对象进行身份比较；默认对象或失效期间旧查询返回的对象不得更新 governor，已写入当前缓存的设置仍须正常应用。
Review comments at @src/repository/system-config.ts:
- Around line 937-939: When a request explicitly includes
payload.enableMemoryAdmission, return a migration-required error if the
enable_memory_admission column is missing instead of silently removing the field
during fallback updates. Preserve compatibility fallback behavior for other
fields.
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📒 Files selected for processing (47)
.env.exampledocs/research/ttft-memory-aware-admission.mddrizzle/0124_system_settings_memory_admission.sqldrizzle/meta/0124_snapshot.jsondrizzle/meta/_journal.jsonmessages/en/settings/config.jsonmessages/ja/settings/config.jsonmessages/ru/settings/config.jsonmessages/zh-CN/settings/config.jsonmessages/zh-TW/settings/config.jsonserver-lib/memory-governor.jssrc/actions/system-config.tssrc/app/[locale]/settings/config/_components/system-settings-form.tsxsrc/app/[locale]/settings/config/page.tsxsrc/app/api/admin/system-config/route.tssrc/app/v1/_lib/proxy-handler.tssrc/app/v1/_lib/proxy/stream-gate/prebuffer-budget.tssrc/drizzle/schema.tssrc/lib/api-client/v1/openapi-types.gen.tssrc/lib/api/v1/schemas/system-config.tssrc/lib/body-store/byte-store.tssrc/lib/body-store/request-body-store.tssrc/lib/config/system-settings-cache.tssrc/lib/memory/governor.tssrc/lib/validation/schemas.tssrc/repository/_shared/transformers.tssrc/repository/system-config.tssrc/types/system-config.tstests/integration/proxy-hedge-lifecycle.test.tstests/unit/actions/system-config-memory-admission-settings.test.tstests/unit/actions/system-config-save.test.tstests/unit/proxy/memory-aware-body-store.test.tstests/unit/proxy/memory-aware-contention.test.tstests/unit/proxy/memory-aware-discovery.test.tstests/unit/proxy/memory-aware-disk-timeout.test.tstests/unit/proxy/memory-aware-lifetime.test.tstests/unit/proxy/memory-aware-switch.test.tstests/unit/proxy/proxy-handler-public-errors.test.tstests/unit/proxy/routing-trace.test.tstests/unit/proxy/stream-gate-content-gate.test.tstests/unit/proxy/stream-gate-forwarder-integration.test.tstests/unit/proxy/stream-gate-ttft-regression.test.tstests/unit/repository/system-config-degradation-ladder.test.tstests/unit/repository/system-config-update-missing-columns.test.tstests/unit/server-memory-governor.test.tstests/unit/server-memory-growth.test.tstests/unit/settings/system-settings-form-memory-admission-toggle.test.tsx
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Code Review Summary
No significant issues identified in this PR. The implementation is consistent, follows existing patterns (mirrors the enableHighConcurrencyMode toggle end-to-end), and includes thorough test coverage of the toggle semantics.
PR Size: XL
- Lines changed: 6,831 (6,756 additions + 75 deletions)
- Files changed: 47
- Note: ~5,890 lines are the auto-generated Drizzle migration snapshot (
drizzle/meta/0124_snapshot.json). Meaningful code changes are ~940 lines across 46 files. - Split suggestion: Not warranted — the remaining changes are cohesive (single toggle wired through schema, types, validation, cache, API, UI, i18n, governor, body store, stream gate, and tests). Splitting would create incomplete intermediate states.
Validation Notes
The Greptile review raised four concerns. I investigated each against the full file context and surrounding code:
-
"Unbounded pre-auth body buffering" (P0) — When admission is off, the decoded-size limit in
loadRequestBodystill applies (independent of the toggle). The change restores pre-v0.9.6 behavior, which is the stated goal. The tradeoff (no memory-based spill or rejection) is explicitly documented in the PR description and i18n strings. -
"Heap safeguard is disabled" (P1) — The V8 heap check (
request-body-store.ts:196) is gated bygovernor.enabled. When admission is off, bodies within the decoded-size limit proceed without a heap headroom check. This is intentional: without a memory budget, the heap check has no meaningful baseline. The PR description acknowledges OOM risk as a known tradeoff when operators disable admission. -
"Stale read changes shared admission" (P1) — The
setEnabledcall on the process-wide governor singleton is subject to normal cache-read TOCTOU. However: (a) settings changes are infrequent admin actions, (b) the window is sub-millisecond, (c) the next request corrects state, and (d) the alternative (per-request governor) would require fundamental architecture changes incompatible with the shared lease pool. The settings-failure test confirms the governor retains its previous state when the cache read throws. -
"Gate waiters remain queued" (P1) — The governor's
acquirepollstryLeaseevery 50ms; aftersetEnabled(false),tryLeasealways succeeds, so governor-level waiters are released within one poll cycle. This is directly tested inmemory-aware-switch.test.ts("排队中的请求在开关关闭后立即放行"). ForStreamGatePrebufferBudget, the limit resolver readsgovernor.enabledlazily, so the limit drops toMAX_SAFE_INTEGERon next evaluation.
Review Coverage
- Logic and correctness — Toggle wiring is consistent across all 47 files; proxy-handler restructuring preserves original fallback behavior (
highConcurrency=false,rawFallback=falseon settings failure) - Security (OWASP Top 10) — No new injection vectors; the decoded-size limit remains as the pre-auth body bound
- Error handling — Settings read failure logs warning and preserves governor state (no silent failure)
- Type safety —
MemoryGovernorinterface extended withenabled: booleanandsetEnabled; noanyintroduced - Documentation accuracy — Comments explain WHY (governor bypass semantics), not WHAT; i18n covers all 5 languages
- Test coverage — New
memory-aware-switch.test.ts(174 lines, 6 cases); proxy-handler tests for settings-driven toggle and failure retention; existing admission tests updated withenabled: true - Code clarity — Follows the
enableHighConcurrencyModetoggle pattern exactly; no unnecessary abstraction
Automated review by Claude AI
…on switch The resource snapshot subtracted raw cgroup usage (memory.current, memory.usage_in_bytes, memsw usage) from the limit. That usage includes reclaimable page cache from spooled bodies, loaded code and logs, so a memory-limited container drifted to zero headroom and every request hit the local 429 after running for a while. Usage is now the working set, memory.current - inactive_file on v2 and usage - total_inactive_file on v1 (memsw included), matching kubelet/cAdvisor. In a 1 GiB cgroup with 704 MiB of written file cache the available estimate goes from 279 MiB to 983 MiB, while real anonymous usage still drives the budget to zero. Review fixes for the admission switch: - only sync the switch from the settings object held in the process cache, so a stale query finishing after invalidation or the fallback object returned on a failed read cannot flip it for the whole process - notify listeners when the switch changes and drain stream gate sub-limit waiters immediately when it turns off Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
… parsing The body_materialize lease was sized for the parse peak, 8192 + 8x bytes + structure, and held for the whole request lifetime, including long streaming responses and background owners. Measured on Claude Code style bodies the lease was 3.2x-4.4x the memory the request actually keeps (buffer plus parsed object), so a backlog of long streams booked leases far above real usage; once usedBytes passed the limit, which follows real free memory, every new request was rejected at body_intake with a local 429 (reported: usedBytes 4.06 GB, limitBytes 2.94 GB, waiting 0). The parse peak stays reserved while the body is decoded and parsed. After parsing, the lease shrinks to the retained estimate 8192 + 4x bytes + structure (raw bytes, UTF-16 worst-case strings, object structure and one outbound serialized copy) on the JSON, non-JSON and multipart paths. For a 3.69 MiB body the held lease goes from 31.9 MiB to 17.2 MiB. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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🧪 测试结果
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @server-lib/memory-governor.js:
- Around line 99-100: Update setEnabled and the waitForCredits/tryGrowAsync
waiting paths so disabling admission wakes pending requests and they recheck the
disabled state before reporting a timeout. Before returning a timeout error,
retry the lease or growth operation so a newly available result is honored.
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📒 Files selected for processing (13)
docs/research/ttft-memory-aware-admission.mdserver-lib/memory-governor.jsserver-lib/resource-snapshot.jssrc/app/v1/_lib/proxy-handler.tssrc/app/v1/_lib/proxy/session.tssrc/app/v1/_lib/proxy/stream-gate/prebuffer-budget.tssrc/lib/body-store/allocation-estimate.tssrc/lib/body-store/request-body-store.tssrc/lib/memory/governor.tstests/unit/proxy/memory-aware-retained-lease.test.tstests/unit/proxy/memory-aware-switch.test.tstests/unit/proxy/proxy-handler-public-errors.test.tstests/unit/server-memory-resources.test.ts
🚧 Files skipped from review as they are similar to previous changes (3)
- src/app/v1/_lib/proxy-handler.ts
- docs/research/ttft-memory-aware-admission.md
- tests/unit/proxy/proxy-handler-public-errors.test.ts
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| this.enabled = next; | ||
| for (const listener of this.enabledListeners) listener(next); |
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🩺 Stability & Availability | 🟠 Major | 🏗️ Heavy lift
关闭准入时唤醒治理器自身的等待请求。
当远程 worker 的 tryGrowAsync 正在等待额度回复时，setEnabled(false) 不会唤醒 waitForCredits。如果回复一直未到，请求仍会等待至超时，并在准入已关闭时抛出 LocalCapacityError。普通 acquire 也可能在最后一次轮询时先检查期限，再检查已关闭的准入状态。请在关闭时唤醒这些等待路径，并在返回超时错误前重试租约或增长。
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Review comment at @server-lib/memory-governor.js around lines 99 - 100:
Update setEnabled and the waitForCredits/tryGrowAsync waiting paths so disabling
admission wakes pending requests and they recheck the disabled state before
reporting a timeout. Before returning a timeout error, retry the lease or growth
operation so a newly available result is honored.
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背景
v0.9.6 引入的内存准入模块在生产中导致客户端大量收到 429，后台记录为「本地处理容量不足」（
local_capacity_exceeded）。排查确认有两处内存识别和判断错误：resource-snapshot.js用memory.max - memory.current计算剩余内存，memory.current包含溢写文件、读取过的代码与日志产生的 page cache。设置了内存上限的容器运行一段时间后剩余额度被压到 0，所有新请求等待 20 秒后返回 429。body_materialize租约按解析峰值8192 + 8 × 字节 + 结构预留，并在整个请求生命周期（含长时间流式响应与后台消费者）内保持。实测为请求实际常驻内存的 3.2 到 4.4 倍。长时间流式请求积压后账面占用远超实际，usedBytes超过随真实内存收紧的limitBytes后，新请求全部在body_intake阶段返回 429（现场数据：usedBytes 4064018912、limitBytes 2938872695、waiting 0）。本 PR 在系统设置中增加「启用内存准入」开关，默认关闭，并修复上述两处错误。
改动
内存准入开关（
enableMemoryAdmission，默认false）关闭时 CCH 不设置任何内存上限，请求直接处理，由系统管理内存：
MemoryGovernor只记账不设限：租约与增长总是成功，acquire不排队，多进程 worker 不向 primary 申请授权。CCH_MEMORY_SPILL_DIR。未压缩正文与 v0.9.6 之前一样不设大小上限；压缩正文仍受MAX_COMPRESSED_REQUEST_BYTES与MAX_DECOMPRESSED_REQUEST_BYTES约束（两种模式相同）。STREAM_GATE_GLOBAL_PREBUFFER_BYTE_CAP子限额与物化前的 V8 堆余量检查不生效。local_capacity_exceeded。开启时，现有全部准入机制按原样生效。
开关生效路径：
proxy-handler在读取入站正文之前读取系统设置缓存，只把进程缓存中的当前设置对象同步到本进程 governor；缓存失效期间完成的旧查询和读取失败时返回的默认对象不改变全进程状态。保存设置后沿用现有的缓存失效广播，各 worker 在下一次请求时生效。开关关闭时，排队中的 governor 请求在下一次轮询（50 ms）放行，门控子限额队列通过开关变化通知立即放行。配置面：
system_settings.enable_memory_admission boolean not null default false（迁移0124_system_settings_memory_admission，由drizzle-kit generate生成）。/api/v1/system/settings的 OpenAPI schema 与生成类型、server action、旧版 admin 路由、zod 校验、设置缓存默认值、列降级阶梯。.env.example注明相关环境变量只在开关开启时生效。cgroup 已用量按 working set 计算
与 kubelet/cAdvisor 一致：v2 为
memory.current - inactive_file，v1 为memory.usage_in_bytes - total_inactive_file，memsw 联合用量同样扣除；成员组与祖先组都按此计算。影响启动预算、worker 运行时上限与多进程协调器。在 1 GiB cgroup（MGLRU 开启的 6.12 内核）中写入 704 MiB 文件：
真实匿名内存占满时预算仍然归零，可回收 cache 不再压缩额度。
解析完成后正文额度收缩到持有量
物化与解析期间仍按峰值预留；解析完成后（JSON、非 JSON、multipart 三条路径）收缩到
8192 + 4 × 字节 + 结构：原始字节、UTF-16 最坏情况下的字符串、对象结构与一份出站序列化副本。Claude Code 形态正文的实测（
--expose-gc，每档 8 个请求取平均）：修复后的余量覆盖出站副本与非 ASCII 字符串按 UTF-16 存储的情况。
截图
默认关闭：
在页面上开启并保存后刷新：
验证
开关端到端：本地构建产物（
node cluster.js，CCH_MEMORY_BUDGET_BYTES=1，独立 PostgreSQL 18 与 Redis 7，AUTO_MIGRATE=true），发送 2 MiB 正文、无效 key 的/v1/messages请求：enable_memory_admission boolean NOT NULL DEFAULT false；GET 返回false401 invalid_api_key，0.14 s（正文读取未受 1 字节预算限制）429 local_capacity_exceeded，20.0 s，Retry-After: 1401，0.03 st，刷新后开关为开；请求429，20.0 sf；请求401，0.03 s全程暂存目录没有产生文件。
working set 端到端：构建产物与 1.5 GiB 文件写入进程运行在同一个
MemoryMax=2G、MemorySwapMax=0的 systemd scope 中，自动预算。写入后memory.current为 1973 MiB（inactive_file1504 MiB），开启内存准入后请求直接进入认证（401，0.15 s）。检查：
bun run lint、bun run typecheck通过。bun run test：923 个文件、9400 个用例通过。bun run test:v1：91 个文件、392 个用例通过。bun run openapi:check、bun run openapi:lint通过。bunx vitest run --config tests/configs/memory-aware.config.mts --coverage：176 个用例通过，行覆盖率 91.5%。bun run build：在干净 worktree 中构建通过。新增与调整的测试：
memory-aware-switch.test.ts：关闭时超额租约与增长成功、不申请跨进程授权、排队请求在关闭后放行、正文不落盘、零额度读取并解压 2 MiB 正文、门控子限额只在开启时生效、关闭时门控队列立即放行、开关变化通知只在状态改变时触发。memory-aware-retained-lease.test.ts：持有量估算公式；JSON、非 JSON、multipart 请求经ProxySession.fromContext解析后body_materialize收缩到持有量、解析期间峰值仍完整预留、响应结束后归零。server-memory-resources.test.ts：v2 成员与祖先组扣除inactive_file、缺少memory.stat时按原值、扣除后不为负、v1 用量与 memsw 扣除total_inactive_file。proxy-handler-public-errors.test.ts：开关由系统设置驱动；关闭时零额度也进入守卫链；设置读取失败与旧查询结果不改变进程状态。enabled: true构造 governor，继续覆盖开启时的全部机制。🤖 Generated with Claude Code