Message Handling with Boolean Algebra Ben Deane / CppCon / 2024-09-16 1Alternative Title "The Unreasonable Effectiveness of Boolean Algebra in Software Design, Showing the Particular Application of of a Message Handling Library, with an Excursion into the Roots of Programming" 2Frontmatter No AI/LLM was used in the creation of this talk. Code is simplified for slides; may have some errors in this talk is about The workings of a message-handling library. How messages and the fields in them are specified. Efficiently identifying (with matchers) a message coming off the wire. The role of Boolean

address these pain points: ● End-to-end : The test framework validates the end (client) to end (broker/exchange) algo behavior. ● Controlled external dependencies : All external dependencies system. It sets up an internal test version of the system with a collection of components, a mocked message channel, and mocked dependencies. ● A BDD layer: Using cpp-cucumber (open source), this layer

Implementations 13 Bloomberg Dependency Injection System Analysis Component Injection Trade Security Broker Pricing Sizing Sending Execute Trade Cancel Trade Reprice Trade Dependency Injection Data bidYield_, askYield_); //... } protected: // ExtraFields std::optional<Broker> bidBroker_; std::optional<Broker> askBroker_; std::optional bidYield_; std::optional askYield_; const std::optional& LocalAsk, const std::optional<Broker>& bidBroker, const std::optional<Broker>& askBroker, const std::optional& bidYield,

.. 逻辑资源按需扩缩容 MQ集群 MQ集群 根据Load等Metrics做 出扩容决策 PV1 Broker1 PV2 Broker2 PV3 Broker3 PV4 Broker4 MQ集群 根据Load等 Metrics做出 扩容决策 PV1 PV3 Broker1 PV2 PV4 Broker2 漂移 物理资源按需扩缩容 高级能力-云原生中间件-应用的基石-MQ为例-2-Mesh化 Citadel Mixer Pliot Galley Injector MQ Broker Envoy MQ Broker Envoy MQ Broker Envoy 注册 Service Service Service Pub sub Pub sub Pub sub xDS Config • MQ Broker把Envoy作为 它与服务之间的代理 • Envoy拓展兼容了PubSub 通信的协议，比如

to the Region information output by the region command in pd-ctl #8412 @zeminzhou • Optimize the message that returns when you call the PD API to delete the TTL configuration #8450 @lhy1024 • Optimize query read requests to reduce the impact on other requests #8457 @nolouch • Optimize the error message that returns when you misconfigure PD microservices #52912 @rleungx • Add the --name startup parameter a new monitoring metric min safe ts #17307 @mittalrishabh • Reduce the memory usage of the peer message channel #16229 @Connor1996 • TiFlash • Support generating ad hoc heap profiling in SVG format #9320

logs #53645 @dveeden • TiCDC • Support directly outputting raw events when the downstream is a Message Queue (MQ) or cloud storage #11211 @CharlesCheung96 2.2.5 Bug fixes • TiDB • Fix the issue that incorrectly in the monitoring dashboard #17133 @King-Dylan • Fix the issue that setting the gRPC message compression method via grpc- �→ compression-type does not take effect on messages sent from TiKV recommended that you avoid mix- ing default and custom values to prevent encountering the Duplicated Error message. • You can use the tidb_allow_remove_auto_inc system variable to allow or forbid removing the AUTO_INCREMENT

you query INFORMATION_ �→ SCHEMA.TIKV_REGION_STATUS #52013 @JmPotato • Fix the incorrect error message displayed when an invalid default value is specified for a column #51592 @danqixu • Fix the issue @wjhuang2016 • TiKV • Fix the issue that resolve-ts is blocked when a stale Region peer ignores the GC message #16504 @crazycs520 • Fix the issue that inactive Write Ahead Logs (WALs) in RocksDB might corrupt recommended that you avoid mix- ing default and custom values to prevent encountering the Duplicated Error message. • You can use the tidb_allow_remove_auto_inc system variable to allow or forbid removing the AUTO_INCREMENT

· · · · · · · · · 1195 7.6.7 When I use TiCDC to replicate messages to Kafka, Kafka returns the Message was too large error. Why? · · · · · · · · · · · · · · · · · · · · · · · · · · · · 1195 7.6.8 How higher?1206 7.7.12 When TiCDC replicates data to Kafka, can I control the maximum size of a single message in TiDB? · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 1206 7.7.13 If I modify · · · · · · · · · · · · · · · · · · · · 1206 7.7.14 When TiCDC replicates data to Kafka, does a message contain multiple types of data changes?· · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

storage #11396 @3AceShowHand Before v8.4.0, when the Claim-Check feature is enabled (by setting large-message �→ -handle-option to claim-check), TiCDC encodes and stores both the key and value fields in the LIKE statement can not be used for cached tables #56134 @tiancaiamao • Fix the confusing warning message for FORMAT() expressions in CTE #56198 @dveeden • Fix the issue that column type restrictions are recommended that you avoid mix- ing default and custom values to prevent encountering the Duplicated Error message. • You can use the tidb_allow_remove_auto_inc system variable to allow or forbid removing the AUTO_INCREMENT

@3pointer * 优化 PITR 日志的输出格式，并在日志中新增 RestoreTS 字段 #53645 @dveeden – TiCDC * 支 持 当 下 游 为 消 息 队 列 (Message Queue, MQ) 或 存 储 服 务 时 直 接 输 出 原 始 事 件 #11211 @CharlesCheung96 2.2.5 错误修复 • TiDB – 修复当 SQL 语句包含 `created_at` + INTERVAL 3 MONTH; 4.6.4.1.4 TTL 和生成列 TTL 可以和生成列一起使用，用来表达更加复杂的过期规则。例如： CREATE TABLE message ( id int PRIMARY KEY, created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP, image bool, expire_at TIMESTAMP { "ErrCode": 36027, "ErrClass": "sync-unit", "ErrScope": "internal", "ErrLevel": "high", "Message": "startLocation: [position: (mysql-bin.000001, 2022), gtid-set:09bec856-ba95-11 �→ ea-850a-58f2b4af5188:1-9