DavidHLPL's personal AI knowledge base, using LLMs to organize traceable technical and engineering knowledge.https://davidhlp.github.ioenhttps://davidhlp.github.io/blog/legacy/information/en/chronicle/?lang=enhttps://davidhlp.github.io/blog/legacy/information/en/chronicle/?lang=enchronicle.yaml · src/content/information/en/chronicle.yamlMon, 05 Oct 2026 05:34:00 GMTeninformationhttps://davidhlp.github.io/blog/legacy/information/en/introduction/?lang=enhttps://davidhlp.github.io/blog/legacy/information/en/introduction/?lang=enHelian Peng (David) · src/content/information/en/introduction.mdMon, 05 Oct 2026 05:34:00 GMTeninformationhttps://davidhlp.github.io/blog/legacy/information/en/kb-index/?lang=enhttps://davidhlp.github.io/blog/legacy/information/en/kb-index/?lang=enKnowledge Base Index · src/content/information/en/kb-index.mdMon, 05 Oct 2026 05:34:00 GMTeninformationhttps://davidhlp.github.io/blog/legacy/information/en/kb-log/?lang=enhttps://davidhlp.github.io/blog/legacy/information/en/kb-log/?lang=enKnowledge Base Operation Log · src/content/information/en/kb-log.mdMon, 05 Oct 2026 05:34:00 GMTeninformationhttps://davidhlp.github.io/blog/legacy/information/en/linkroll/?lang=enhttps://davidhlp.github.io/blog/legacy/information/en/linkroll/?lang=enlinkroll.mdx · src/content/information/en/linkroll.mdxMon, 05 Oct 2026 05:34:00 GMTeninformationhttps://davidhlp.github.io/blog/legacy/information/en/policy/?lang=enhttps://davidhlp.github.io/blog/legacy/information/en/policy/?lang=enPrivacy Policy · src/content/information/en/policy.mdMon, 05 Oct 2026 05:34:00 GMTeninformationhttps://davidhlp.github.io/blog/legacy/note/en/database-written-test-review/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/database-written-test-review/?lang=enA database written-test review as a verifiable chain of judgments: separate SQL semantics from dialects, handle NULLs, duplicates, and empty results, then bring Kettle and very large table operations down to sharding, recovery, reconciliation, and risk control.Sat, 12 Sep 2026 16:00:00 GMT数据库SQLOracleMySQLSpark SQLKettleETL笔试复盘ennotehttps://davidhlp.github.io/blog/legacy/note/en/resicache-early-expiration-cas/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/resicache-early-expiration-cas/?lang=enHow ResiCache uses cache-value versions, Redis Lua CAS, and the normal miss path to prevent an old asynchronous job from modifying a newer cache value.Tue, 08 Sep 2026 16:00:00 GMTResiCacheRedisEarlyExpirationCASConcurrencyennotehttps://davidhlp.github.io/blog/legacy/note/en/resicache-handler-chain-and-observer/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/resicache-handler-chain-and-observer/?lang=enHow ResiCache's current line uses HandlerResult, handler snapshots, in-lock fragments, and observer scope tokens to preserve control-flow and lifecycle boundaries in a cache responsibility chain.Tue, 08 Sep 2026 16:00:00 GMTResiCacheJavaChainOfResponsibilityObserverThreadLocalConcurrencyennotehttps://davidhlp.github.io/blog/legacy/note/en/resicache-serialization-migration/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/resicache-serialization-migration/?lang=enWhy wire format, type trust, and migration of existing data must be designed together, based on ResiCache's secure deserialization and migration engine.Tue, 08 Sep 2026 16:00:00 GMTResiCacheRedisSerializationSecurityMigrationennotehttps://davidhlp.github.io/blog/legacy/note/en/resicache-single-flight/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/resicache-single-flight/?lang=enWhat single-flight, distributed locking, double-checking, and failure-result modeling each solve in ResiCache's load path—and what they cannot guarantee.Tue, 08 Sep 2026 16:00:00 GMTResiCacheRedisSingleFlightConcurrencyDistributedLockennotehttps://davidhlp.github.io/blog/legacy/note/en/resicache/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/resicache/?lang=enExamines five designs in pinned source and boundary tests: responsibility chains, single-flight, versioned early expiration, whitelist serialization, and observer lifecycles, while separating repository evidence from production performance claims.Tue, 08 Sep 2026 16:00:00 GMTResiCacheSpringCacheRedisConcurrencySingleFlightSerializationCASEarlyExpirationLLMennotehttps://davidhlp.github.io/blog/legacy/note/en/ulticode-async-execution-contract/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/ulticode-async-execution-contract/?lang=enHow UltiCode lets synchronous previews and asynchronous execution share a contract, using idempotency keys, SHA-256 fingerprints, a state machine, and memory limits to constrain long-running jobs.Tue, 08 Sep 2026 16:00:00 GMTUltiCodeOnlineJudgeAsyncIdempotencyFingerprintStateMachineJudge0LLMennotehttps://davidhlp.github.io/blog/legacy/note/en/ulticode-ci-supply-chain/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/ulticode-ci-supply-chain/?lang=enHow UltiCode organizes zero-infra static contracts, layered verification, Trivy, SBOM, provenance, and Cosign into traceable delivery gates.Tue, 08 Sep 2026 16:00:00 GMTUltiCodeCIStaticCheckIntegrationTestTrivySBOMCosignProvenanceLLMennotehttps://davidhlp.github.io/blog/legacy/note/en/ulticode-core-bounded-testbed/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/ulticode-core-bounded-testbed/?lang=enHow UltiCode Core's owner-context manager uses opt-in, an allowlist, bounded startup, and close-once handoff to keep a modular monolith a reversible topology testbed.Tue, 08 Sep 2026 16:00:00 GMTUltiCodeModularMonolithLifecycleClassLoaderAllowlistFailClosedTestingLLMennotehttps://davidhlp.github.io/blog/legacy/note/en/ulticode-docker-sandbox/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/ulticode-docker-sandbox/?lang=enWhat UltiCode's D-form execution path says about Docker resource and security parameters, fail-closed seccomp handling, and the distinction between user and infrastructure errors.Tue, 08 Sep 2026 16:00:00 GMTUltiCodeOnlineJudgeDockerSeccompSandboxResourceLimitErrorHandlingLLMennotehttps://davidhlp.github.io/blog/legacy/note/en/ulticode-fenced-singleton-lease/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/ulticode-fenced-singleton-lease/?lang=enWhy an expiry time alone is insufficient, and how UltiCode's fenced_job_leases and reconciliation-run writes invalidate an old executor at the database boundary.Tue, 08 Sep 2026 16:00:00 GMTUltiCodeFencedLeaseDistributedLockReconciliationCASMySQLConcurrencyLLMennotehttps://davidhlp.github.io/blog/legacy/note/en/ulticode-generation-attempt-fence/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/ulticode-generation-attempt-fence/?lang=enHow UltiCode uses generations, attemptIds, leases, and conditional updates to stop rejudges, timeouts, or old workers from overwriting newer state.Tue, 08 Sep 2026 16:00:00 GMTUltiCodeOnlineJudgeGenerationAttemptIdLeaseCASConcurrencyLLMennotehttps://davidhlp.github.io/blog/legacy/note/en/ulticode-outbox-redis-streams/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/ulticode-outbox-redis-streams/?lang=enHow UltiCode uses a database outbox, atomic Redis Streams delivery, retries/dead letters, and PEL recovery to turn a judging message into recoverable state.Tue, 08 Sep 2026 16:00:00 GMTUltiCodeOnlineJudgeOutboxRedisStreamsRetryDeadLetterIdempotencyLLMennotehttps://davidhlp.github.io/blog/legacy/note/en/ulticode-owner-and-facts/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/ulticode-owner-and-facts/?lang=enHow UltiCode's owner boundaries and SubmissionFactsSnapshot turn the source, capture time, and schema version of cross-service facts into an explicit contract.Tue, 08 Sep 2026 16:00:00 GMTUltiCodeOnlineJudgeDataOwnerContractPortProjectionSnapshotLLMennotehttps://davidhlp.github.io/blog/legacy/note/en/ulticode-owner-local-audit-inbox/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/ulticode-owner-local-audit-inbox/?lang=enHow Auth/App local audit outboxes, owner-specific Redis Streams, and an Admin consumer inbox handle double writes, duplicate delivery, lease recovery, and eventual consistency across owners.Tue, 08 Sep 2026 16:00:00 GMTUltiCodeAuditDataOwnerOutboxInboxRedisStreamsEventualConsistencyIdempotencyLLMennotehttps://davidhlp.github.io/blog/legacy/note/en/ulticode/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/ulticode/?lang=enA source-based study of owner boundaries, snapshots, recoverable delivery, result fencing, Docker isolation, asynchronous contracts, and supply-chain gates, with explicit evidence limits.Tue, 08 Sep 2026 16:00:00 GMTUltiCodeOnlineJudgeDDDPortProjectionOutboxRedisStreamsDockerSeccompCILLMennotehttps://davidhlp.github.io/blog/legacy/note/en/hindsight-local-deployment/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/hindsight-local-deployment/?lang=enDocuments the local compute split for the Vectorize Hindsight memory hub (AMD GPU inference plus CPU embedding), the UID 1000 permission model, and Docker Compose container orchestration.Sat, 22 Aug 2026 16:00:00 GMTHindsightDockerOllamaROCmBGE-M3Architectureennotehttps://davidhlp.github.io/blog/legacy/note/en/hindsight-omp-codex-integration/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/hindsight-omp-codex-integration/?lang=enExplains the FastMCP stdio bridge state machine, Git-root-adaptive dynamic Bank routing, and dual-client configuration used to give OMP and Codex unified access to Hindsight memory.Sat, 22 Aug 2026 16:00:00 GMTHindsightOMPCodexFastMCPMCPDynamicRoutingennotehttps://davidhlp.github.io/blog/legacy/note/en/hindsight-troubleshooting/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/hindsight-troubleshooting/?lang=enSummarizes seven typical failure modes in Hindsight local deployment and Agent integration (wrong package, permissions, timeout, routing, lost Session, and workspace drift) with a troubleshooting matrix.Sat, 22 Aug 2026 16:00:00 GMTHindsightTroubleshootingDockerPermissionsFastMCPOllamaennotehttps://davidhlp.github.io/blog/legacy/note/en/docker-fundamentals/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/docker-fundamentals/?lang=enDistills Docker image layers, common commands, volumes, networking, and Compose suitability and boundaries.Thu, 20 Aug 2026 16:00:00 GMTDockerContainerComposeImageVolumeNetworkennotehttps://davidhlp.github.io/blog/legacy/note/en/frontend-mybatis-essays/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/frontend-mybatis-essays/?lang=enArchived collection of frontend, MyBatis and environment troubleshooting notes. Original evidence remains in immutable raw snapshots.Thu, 20 Aug 2026 16:00:00 GMTVueMyBatisUniAppCacheEssayennotehttps://davidhlp.github.io/blog/legacy/note/en/hbase-foundation-and-ops/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/hbase-foundation-and-ops/?lang=enConverges logical/physical models, architecture, table design, and operational tooling; clarifies trade-offs vs RDBMS.Thu, 20 Aug 2026 16:00:00 GMTHBaseBigDataDataModelArchitectureShellJavaAPIennotehttps://davidhlp.github.io/blog/legacy/note/en/java-concurrency-deepdive/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/java-concurrency-deepdive/?lang=enCenters on CAS to connect atomics, locks, thread coordination, and reference types with cost boundaries.Thu, 20 Aug 2026 16:00:00 GMTJavaJUCCASConcurrencyLockThreadennotehttps://davidhlp.github.io/blog/legacy/note/en/mysql-storage-and-deadlock/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/mysql-storage-and-deadlock/?lang=enDistinguishes engine capabilities from deadlock log paths with minimal checks.Thu, 20 Aug 2026 16:00:00 GMTMySQLStorageEngineInnoDBDeadlockennotehttps://davidhlp.github.io/blog/legacy/note/en/redis-business-patterns/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/redis-business-patterns/?lang=enAnchors on consistency, mutual exclusion, and messaging semantics to distill reusable business patterns.Thu, 20 Aug 2026 16:00:00 GMTRedisCacheDistributedLockMessageQueueFeedSeckillennotehttps://davidhlp.github.io/blog/legacy/note/en/redis-heima-practice/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/redis-heima-practice/?lang=enCondenses 200+ pages of course material into a checklist, flagging version and experimental gaps.Thu, 20 Aug 2026 16:00:00 GMTRedisHeimaDistributedCacheMultiLevelCacheBestPracticeennotehttps://davidhlp.github.io/blog/legacy/note/en/redis-persistence-principle/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/redis-persistence-principle/?lang=enDistinguishes snapshot vs append-only recovery and performance boundaries.Thu, 20 Aug 2026 16:00:00 GMTRedisPersistenceRDBAOFDataStructurePrincipleennotehttps://davidhlp.github.io/blog/legacy/note/en/spark-bigdata-ecosystem/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/spark-bigdata-ecosystem/?lang=enCompares batch/stream engines and Spark runtime modes.Thu, 20 Aug 2026 16:00:00 GMTSparkHadoopBigDataHBaseClusterennotehttps://davidhlp.github.io/blog/legacy/note/en/spring-cloud-and-boot/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/spring-cloud-and-boot/?lang=enAnchors on service discovery to distill call-chain contracts.Thu, 20 Aug 2026 16:00:00 GMTSpringBootSpringCloudMicroservicesGatewayTransactionObservabilityennotehttps://davidhlp.github.io/blog/legacy/note/en/hindsight-local-deployment-and-agent-integration/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/hindsight-local-deployment-and-agent-integration/?lang=enHistorical integrated page, split into deployment, agent integration and troubleshooting pages. Retained as an archive guide.Mon, 17 Aug 2026 12:00:00 GMTHindsightMemoryOMPCodexMCPOllamaROCmBGE-M3ArchitectureTroubleshootingennotehttps://davidhlp.github.io/blog/legacy/note/en/omp-headroom-provider-proxy/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/omp-headroom-provider-proxy/?lang=enDocuments how OMP Headroom Bridge uses an external controller to maintain the coexistence boundaries between a loopback Headroom, OMP provider routes, the native Codex CLI/Desktop Responses provider, and Claude Code/cc-switch.Thu, 13 Aug 2026 14:18:29 GMTOMPHeadroomCodexOpenCodeClaudeCodeProxyRoutingsystemdSecurityennotehttps://davidhlp.github.io/blog/legacy/note/en/headroom-cc-switch-coexistence/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/headroom-cc-switch-coexistence/?lang=enSynthesizes pinned project commits and runtime evidence: how Headroom 8787 receives Claude Code Messages before cc-switch 15721, keeping the OMP path isolated, a single synthesis responsibility, and a rollback-safe systemd security boundary.Thu, 13 Aug 2026 07:31:11 GMTHeadroomcc-switchClaudeCodeOMPAnthropicOpenAIProxyRoutingSecurityCompressionennotehttps://davidhlp.github.io/blog/legacy/note/en/database-schema-drift/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/database-schema-drift/?lang=enExplains why Flyway validate cannot replace an actual Schema check, and uses the three views of migration history, actual schema, and application query to distinguish checksum drift, external DDL, Unknown column, and residue from a failed migration.Wed, 12 Aug 2026 16:00:00 GMTFlywayMySQLSchema DriftMigrationDatabaseTroubleshootingennotehttps://davidhlp.github.io/blog/legacy/note/en/dubbo-nacos-runtime/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/dubbo-nacos-runtime/?lang=enBased on Apache Dubbo 3.3.6 and official Nacos materials, describes the minimal boundaries of interface-level/application-level registration names, metadata, group/version matching, startup checks, and a real Nacos smoke test.Wed, 12 Aug 2026 16:00:00 GMTApache DubboNacosService DiscoveryRegistryRPCSmoke Testennotehttps://davidhlp.github.io/blog/legacy/note/en/jjwt-013-security-api/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/jjwt-013-security-api/?lang=enExplains the recommended algorithm heuristic of signWith(Key), the two-argument explicit-algorithm API, the SecretKey/PublicKey type boundaries of verifyWith, and the migration path for the audience builder in JJWT 0.13.0.Wed, 12 Aug 2026 16:00:00 GMTJJWTJWTJWSSecurityHS256RS256Authenticationennotehttps://davidhlp.github.io/blog/legacy/note/en/kb-session-ingest-contract/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/kb-session-ingest-contract/?lang=enPins the minimal contract of the KB session ingestion pipeline at commit c0ae74e: identity/content-hash-driven incremental reuse, no reuse of failed records, redaction v19, internal control-plane filtering, partial checkpoint resume, and immutable raw manifest validation, and clarifies placeholder semantics and redaction boundaries.Wed, 12 Aug 2026 16:00:00 GMTKnowledge BaseIngestionRedactionHashingManifestRaw Evidenceennotehttps://davidhlp.github.io/blog/legacy/note/en/mcp-codebase-memory-workflow/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/mcp-codebase-memory-workflow/?lang=enThe boundary and error codes between the MCP 2026-07-28 modern per-request _meta and the legacy initialize handshake, plus the codebase-memory-mcp v0.10.2 graph-search workflow: graph results are not a completeness proof, and negative conclusions must return to coverage and source code.Wed, 12 Aug 2026 16:00:00 GMTMCPSpecificationKnowledge GraphCode IntelligenceWorkflowCodebase Memoryennotehttps://davidhlp.github.io/blog/legacy/note/en/microservice-data-ownership/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/microservice-data-ownership/?lang=enEstablishes an order for determining data ownership with service-private data, bounded context, saga, transactional outbox, and expand-migrate-contract, so a shared physical database, a shared schema, and service autonomy are not conflated.Wed, 12 Aug 2026 16:00:00 GMTMicroservicesBounded ContextData OwnershipDatabase-per-ServiceSagaTransactional OutboxStrangler Figennotehttps://davidhlp.github.io/blog/legacy/note/en/multi-service-readiness/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/multi-service-readiness/?lang=enUses a decision table to distinguish six concepts in multi-service orchestration — process startup, business readiness, ordering, dependency establishment, and failure/restart propagation — and gives the minimal combinations and verification paths for Compose healthcheck/depends_on and systemd After/Wants/Requires.Wed, 12 Aug 2026 16:00:00 GMTDocker Composesystemddepends_onhealthcheckReadinessOrchestrationennotehttps://davidhlp.github.io/blog/legacy/note/en/redis-jackson-java-time/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/redis-jackson-java-time/?lang=enExplains why the default JsonJacksonCodec and GenericJackson2JsonRedisSerializer fail at write time for LocalDateTime, that the Redisson default codec is actually Kryo5Codec, and the three-layer decision path for troubleshooting write-read asymmetry.Wed, 12 Aug 2026 16:00:00 GMTRedisRedissonJacksonJavaTimeLocalDateTimeSpring Data RedisSerializationennotehttps://davidhlp.github.io/blog/legacy/note/en/resicache-observer-nested-execution/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/resicache-observer-nested-execution/?lang=enDistills from a public ResiCache fixed commit the boundaries of the observer lifecycle, lock-held fragments, per-call scope tokens, and ThreadLocal snapshot isolation, to avoid nested execution re-firing hooks or polluting concurrent state.Wed, 12 Aug 2026 16:00:00 GMTJavaObserverThreadLocalConcurrencyRedisCacheReentrantennotehttps://davidhlp.github.io/blog/legacy/note/en/testcontainers-docker-api/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/testcontainers-docker-api/?lang=enExplains how Testcontainers 1.20.6 falls back to 1.32 for an unknown Docker API version, why DOCKER_API_VERSION should not borrow Docker CLI experience, and how to distinguish version incompatibility from a missing Docker environment starting from the earliest 400 error.Wed, 12 Aug 2026 16:00:00 GMTTestcontainersDockerdocker-javaAPI-VersionMobyDiagnosticsennotehttps://davidhlp.github.io/blog/legacy/note/en/headroom-compress-retrieve-contract/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/headroom-compress-retrieve-contract/?lang=enPins the Headroom 0.34.0 /v1/compress and /v1/retrieve request, response, and mode boundaries, and explains why mocks and real loopback contract tests must share one schema.Tue, 11 Aug 2026 16:00:00 GMTHeadroomAPICompressionCCRContract TestingAgentennotehttps://davidhlp.github.io/blog/legacy/jotting/en/kb-ingest-todo/?lang=enhttps://davidhlp.github.io/blog/legacy/jotting/en/kb-ingest-todo/?lang=enSources and questions awaiting evidence review are ingestion candidates, not stable knowledge.Fri, 07 Aug 2026 00:00:00 GMTKnowledge BaseIngestTODOenjottinghttps://davidhlp.github.io/blog/legacy/note/en/llm-wiki-pattern/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/llm-wiki-pattern/?lang=enThe operating manual for DavidHLPL's personal AI knowledge base: raw sources, wiki pages, schema, and the ingest/query/lint loop.Fri, 07 Aug 2026 00:00:00 GMTLLMKnowledge BaseWikiRAGAgentennotehttps://davidhlp.github.io/blog/legacy/note/en/omp-headroom-persistence/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/omp-headroom-persistence/?lang=enSynthesizes Headroom route persistence when OMP rewrites runtime model caches: Named Profiles isolate intent and credentials, an external declaration can preserve route intent, model_cache remains rebuildable derived state, and the legacy reconciler is limited to isolated migration recovery. Current wrapper lifecycle and version dependencies are explicit.Wed, 05 Aug 2026 16:00:00 GMTOMPAgentHeadroomDevOpsLLMOperationsRoutingProxyCodexOpenCodeennotehttps://davidhlp.github.io/blog/legacy/note/en/headroom-single-port-evolution/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/headroom-single-port-evolution/?lang=enSynthesizes the Headroom single-port routing model: one loopback entry can serve explicitly configured custom providers and dynamic upstreams while preserving protocol differences. It separates OMP role selection, model_cache, request routing, and wrapper lifecycle and verifies each layer independently. Historical routes remain provisional.Fri, 31 Jul 2026 16:00:00 GMTOMPAgentHeadroomDevOpsLLMOperationsRoutingProxyCodexKimiMiniMaxZhipuennotehttps://davidhlp.github.io/blog/legacy/note/en/intranet-penetration-ssh-guide/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/intranet-penetration-ssh-guide/?lang=enA five-axis comparison of Cloudflare Tunnel, Tailscale, and FRP—connection direction, exposure, control plane, data plane, and recovery—with evidence-backed boundaries for mobile clients, ports, and systemd/linger.Fri, 31 Jul 2026 16:00:00 GMTIntranet PenetrationCloudflareTailscaleFRPSSHTermiussystemdDevOpsennotehttps://davidhlp.github.io/blog/legacy/note/en/omp-config-and-rules-guide/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/omp-config-and-rules-guide/?lang=enA reusable model for OMP configuration layers: modelRoles selects a role default, agentModelOverrides supplies a local exception, and fallbackChains recovers after failure; the page also separates Headroom, rule discovery, and model selection and gives an ordered validation method.Fri, 31 Jul 2026 16:00:00 GMTOMPAgentHeadroomDevOpsLLMOperationsRTKRulesConfigurationArchitectureennotehttps://davidhlp.github.io/blog/legacy/note/en/omp-hook-extension-guide/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/omp-hook-extension-guide/?lang=enTreats an OMP Hook as an event extension at a tool decision point: sendMessage supplies a soft nudge without blocking, a hard result can reject a call, and setStatus bridges state into the UI. Includes API boundaries, mock and live-session checks, and the explicit warning that a suggestion is not a security boundary.Fri, 24 Jul 2026 16:00:00 GMTAgentOMPCodebaseHooksDevOpsTUIPluginExtensionennotehttps://davidhlp.github.io/blog/legacy/note/en/mysql-performance-troubleshooting/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/mysql-performance-troubleshooting/?lang=enMap MySQL slowness, stalls, connection piles, and replication alerts to symptoms, metrics, layers, and safe mitigations across connections, locks, indexes, transactions, Buffer Pool, and I/O—without copying a full SOP.Tue, 30 Jun 2026 16:00:00 GMTMySQLDatabaseTroubleshootingPerformanceInnoDBOperationsennotehttps://davidhlp.github.io/blog/legacy/preface/en/2026-06-19-18-00-00/?lang=enhttps://davidhlp.github.io/blog/legacy/preface/en/2026-06-19-18-00-00/?lang=enJohn Johnson · 2026-06-19-18-00-00 · src/content/preface/en/2026-06-19-18-00-00.mdFri, 19 Jun 2026 10:00:00 GMTenprefacehttps://davidhlp.github.io/blog/legacy/note/en/plugin-lifecycle-management/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/plugin-lifecycle-management/?lang=enA control-plane model for making plugin install, upgrade, uninstall, and rule delivery converge safely through a desired/current/ack/failure state machine, merged heartbeats, idempotent dispatch, canary circuit breakers, and explicit source assumptions about scale and endpoint capabilities.Mon, 01 Jun 2026 16:00:00 GMTDistributed SystemsArchitecture DesignEndpoint ManagementCanary ReleaseHigh Availabilityennotehttps://davidhlp.github.io/blog/legacy/note/en/uisa-architecture-design/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/uisa-architecture-design/?lang=enA synthesis of Enhanced UISA and the plugin-lifecycle source, reorganized around owner/boundary, sync protocol, reliability and idempotency, heterogeneous nodes, failure recovery, and trade-offs rather than an architecture-blog sequence. Scale and thresholds remain source assumptions, not production promises.Wed, 25 Mar 2026 00:00:00 GMTArchitectureDistributionSecurityInfrastructureSyncHybridCloudennotehttps://davidhlp.github.io/blog/legacy/note/en/containerd-tls-troubleshooting/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/containerd-tls-troubleshooting/?lang=enA layer-by-layer decision model for private-registry pull failures: separate certificate trust, containerd configuration, Kubernetes credentials, and node cache, then choose a production CA or a temporary skip_verify probe.Tue, 24 Feb 2026 16:00:00 GMTKubernetescontainerdTLSHarborOperationsTroubleshootingennotehttps://davidhlp.github.io/blog/legacy/note/en/java-internship-interview-blog-polished/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/java-internship-interview-blog-polished/?lang=enSynthesizes a capability model that moves from proving project ownership, through cache and asynchronous mechanisms, to production evidence for diagnosis, mitigation, and recovery.Tue, 24 Feb 2026 16:00:00 GMTJavaBackendInternship InterviewRedisDockerKafkaWebSocketJVMProduction Troubleshootingennotehttps://davidhlp.github.io/blog/legacy/note/en/java-online-performance-debug/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/java-online-performance-debug/?lang=enCompresses Java production incidents into a minimal decision tree from symptom and evidence to thread, GC, or code localization, followed by reversible mitigation and recovery.Tue, 24 Feb 2026 16:00:00 GMTLinuxOperationsSREPerformance TroubleshootingCPUJavaProduction IncidentArthasJVMHot-Swappingennotehttps://davidhlp.github.io/blog/legacy/preface/en/2026-01-01-00-00-00/?lang=enhttps://davidhlp.github.io/blog/legacy/preface/en/2026-01-01-00-00-00/?lang=enDonald Knuth · 2026-01-01-00-00-00 · src/content/preface/en/2026-01-01-00-00-00.mdThu, 01 Jan 2026 00:00:00 GMTenprefacehttps://davidhlp.github.io/blog/legacy/note/en/java-null-value/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/java-null-value/?lang=enExplains why a cache must distinguish a missing key from a business null, how NullValue prevents repeated negative lookups, and where singleton and serialization semantics stop.Tue, 07 Oct 2025 13:43:00 GMTJavaSpring CacheCachingNull ObjectDesign Patternsennotehttps://davidhlp.github.io/blog/legacy/note/en/java-atomic-boolean/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/java-atomic-boolean/?lang=enExplains when an atomic boolean state is needed, how compareAndSet combines checking with transition, and where CAS stops helping with multi-field invariants, contention, and coordination.Tue, 07 Oct 2025 12:25:00 GMTJavaConcurrencyAtomicBooleanCASJUCennotehttps://davidhlp.github.io/blog/legacy/note/en/java-auto-closeable/?lang=enhttps://davidhlp.github.io/blog/legacy/note/en/java-auto-closeable/?lang=enExplains AutoCloseable and try-with-resources through resource ownership, reverse close order, primary and suppressed exceptions, and the boundaries of idempotent cleanup.Tue, 07 Oct 2025 12:25:00 GMTJavaJDKException HandlingResource ManagementTry-With-Resourcesennote