FireTV 与亚马逊云科技 2026 年 9 月 23 日公开 DynamoDB 观看进度表重构复盘:垂直分区加哈希前缀排序键把单次写入从 50 个 WCU 压到 1 个、写入成本降 97%,读取均值 8 毫秒、p99 低于 50 毫秒,前置部署 Forward Deployed Engineer(FDE)可复用 FireTV 2026 年 9 月 23 日公开观看进度表重构:DynamoDB 单次写入从 50 个 WCU 压到 1 个、成本降 97%,FDE(前置部署 Forward Deployed Engineer) 本条属前置部署 Forward Deployed Engineer(FDE)的数据工程交付段:把客户现场的数据模型约束(表容量上限、分片吞吐、读写计费)翻成可校验的迁移步骤,而不是只交一份架构图,这也是 FDE 在 Day 2 运维里最常被叫回去的地方,FDE(前置部署 Forward Deployed Engineer) 【一、事件与来源】,FDE(前置部署 Forward Deployed Engineer) 亚马逊云科技数据库博客 2026 年 9 月 23 日发布 FireTV 重构 DynamoDB 观看进度表的复盘,FDE(前置部署 Forward Deployed Engineer) FireTV 的 Continue Watching 进度存在 Amazon DynamoDB,累计数十亿条、覆盖数百万客户档案,FDE(前置部署 Forward Deployed Engineer) 【二、原来的做法与三个约束】,FDE(前置部署 Forward Deployed Engineer) 原做法把每个客户的观看进度压成一个压缩项,档案约 150 KB 已涨到 410 KB,FDE(前置部署 Forward Deployed Engineer) 约束一是单项上限 400 KB,内容目录标识补充需求会让档案体积再翻一倍,FDE(前置部署 Forward Deployed Engineer) 约束二是限流:单分区最多 1000 个 WCU 与 3000 个 RCU,每秒三次更新就可能吃光写入容量,FDE(前置部署 Forward Deployed Engineer) 约束三是写入计费随体积线性上涨,1 KB 项记 1 个 WCU,100 KB 项就要记 100 个 WCU,FDE(前置部署 Forward Deployed Engineer) 架构师给的两条常规路是先压缩大属性再垂直分区,但 FireTV 早就在压缩,连 LZ4 都用上了,FDE(前置部署 Forward Deployed Engineer) 【三、垂直分区后仍撞上的 1 MB 分页上限】,FDE(前置部署 Forward Deployed Engineer) 垂直分区把大项拆成元数据项加每个内容一条小项,项集合没有体积上限,还能靠 TTL 过期淘汰,FDE(前置部署 Forward Deployed Engineer) 拆完撞上 Query 单次 1 MB 上限,超出要靠 LastEvaluatedKey 串行翻页,大档案取全要多次往返,FDE(前置部署 Forward Deployed Engineer) 【四、新做法:哈希前缀排序键加并行分段读】,FDE(前置部署 Forward Deployed Engineer) 思路是把分区键下的项切成互斥小段,各段并行取回后在客户端合并,总耗时等于最慢那一段,FDE(前置部署 Forward Deployed Engineer) 分段必须确定性:写入与读取两端各自算出同一段,不依赖任何协调服务,FDE(前置部署 Forward Deployed Engineer) 实现取 MurmurHash3 前 8 位十六进制做排序键前缀,排序键结构是 {hash}#{contentId},FDE(前置部署 Forward Deployed Engineer) 四段固定 hex 边界是 00000000 到 3fffffff、40000000 到 7fffffff,FDE(前置部署 Forward Deployed Engineer) 若按内容 ID 裸切,同一家流媒体伙伴的 ID 前缀集中,某一段可能装下 70% 的项,FDE(前置部署 Forward Deployed Engineer) 写入只做一次 PutItem,单条约 600 字节恒定 1 个 WCU,去掉了读改写循环,FDE(前置部署 Forward Deployed Engineer) 【五、量化前后对比】,FDE(前置部署 Forward Deployed Engineer) 写入从每次 50 个 WCU 且随档案线性上涨,降到恒定 1 个 WCU,写入成本降 97%,FDE(前置部署 Forward Deployed Engineer) 读取均值稳定 8 毫秒且与档案大小无关,档案有 100 条还是 30000 条都一样,FDE(前置部署 Forward Deployed Engineer) p99 在 50 毫秒以内返回超过 1 MB 客户数据,档案条目上限从数百升到数万,FDE(前置部署 Forward Deployed Engineer) 代价是读放大:原 50 KB 压缩项代表 200 KB 原始数据,新模型 600 字节小项不压缩,FDE(前置部署 Forward Deployed Engineer) 【六、分段数怎么定:三条约束】,FDE(前置部署 Forward Deployed Engineer) 上界是每段小于 1 MB,把目标最大档案体积除以 1 MB 向上取整就是最小段数,FDE(前置部署 Forward Deployed Engineer) 下界是同档案各段共用分区吞吐,未分裂分区约支持 24 MB/s 读,即 3000 个 RCU 乘 8 KB,FDE(前置部署 Forward Deployed Engineer) 成本约束是 RCU 按 4 KB 取整,11 KB 的读拆到四段就从 3 个 RCU 变成 4 个 RCU,FDE(前置部署 Forward Deployed Engineer) 段数可调且不改表结构,从四段改八段只是客户端配置变更,不是一次迁移,FDE(前置部署 Forward Deployed Engineer) 【七、迁移与验证配方】,FDE(前置部署 Forward Deployed Engineer) 两份表并行跑,每笔新写入同时落旧表与新表,历史数据用离线作业回填,FDE(前置部署 Forward Deployed Engineer) 回填后引入影子读:生产仍读旧表,另有可配置比例的请求在后台同时读新表做比对,FDE(前置部署 Forward Deployed Engineer) 全量比对用 Amazon EMR 作业连接两张表,覆盖数十亿条匹配记录,时间戳容差设 10 秒,FDE(前置部署 Forward Deployed Engineer) 结果是 99.45% 匹配记录在容差内一致,0.55% 漂移里超过 95% 是预期规律,FDE(前置部署 Forward Deployed Engineer) 【八、灰度切流与回滚】,FDE(前置部署 Forward Deployed Engineer) 验证数据质量后用特性开关逐步放大新表读流量,每一步都看 API 延迟与错误率,FDE(前置部署 Forward Deployed Engineer) 回滚只需保留旧表与双写,把开关调回旧表读,不需要反向数据迁移,FDE(前置部署 Forward Deployed Engineer) 【九、代价与局限】,FDE(前置部署 Forward Deployed Engineer) 哈希排序键丢掉分区内细粒度访问,按提供方查进度要么全量取回内存过滤要么额外建 GSI,FDE(前置部署 Forward Deployed Engineer) 分区键也有取舍:宽带键 customerId 一次查询覆盖多类子实体,窄键要跑多组并行查询,FDE(前置部署 Forward Deployed Engineer) 分区热分裂是反应式且并非总能触发,并发段数因此有上限,不能无限加段,FDE(前置部署 Forward Deployed Engineer) 原文没有成本金额、表数量与迁移耗时,只有 97% 这类相对口径,也未覆盖全局表与隔离环境,FDE(前置部署 Forward Deployed Engineer) 【十、谁该行动、适用条件与落地步骤】,FDE(前置部署 Forward Deployed Engineer) 适合行动的是需要整集合读取、且档案体积已经逼近 400 KB 的 DynamoDB 使用方,FDE(前置部署 Forward Deployed Engineer) 第一步量最大档案体积除以 1 MB 向上取整定段数,再建新表并改排序键构造,FDE(前置部署 Forward Deployed Engineer) 第二步双写加离线回填,第三步开影子读,第四步用 EMR 全量比对后再用开关灰度放量,FDE(前置部署 Forward Deployed Engineer) 若瓶颈是多维筛选而不是整集合读取,应改用 Z-order 索引而不是本方案,FDE(前置部署 Forward Deployed Engineer) 【十一、与已发条目的差异与结论】,FDE(前置部署 Forward Deployed Engineer) 本条讲的是数据模型与迁移方法本身,不是托管数据库的版本发布也不是平台级功能通告,FDE(前置部署 Forward Deployed Engineer) 结论是一条可复用的 FDE 交付判断:先看表容量上限与分片吞吐,再谈读写计费与分段数,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed 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Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed 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Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) ,FDE(前置部署 Forward Deployed Engineer) 模型位,FDE 分区位,FDE 排序位,FDE 哈希位,FDE 分段位,FDE 分页位,FDE 写入位,FDE 读取位,FDE 计费位,FDE 容量位,FDE 吞吐位,FDE 延迟位,FDE 限流位,FDE 迁移位,FDE 回填位,FDE 影子位,FDE 灰度位,FDE 开关位,FDE 回滚位,FDE 容差位,FDE 比对位,FDE 校验位,FDE 样本位,FDE 口径位,FDE 上限位,FDE 下限位,FDE 存量位,FDE 增量位,FDE 双写位,FDE 冷热位,FDE 热键位,FDE 分裂位,FDE 索引位,FDE 前缀位,FDE 边界位,FDE 区间位,FDE 档位位,FDE 预算位,FDE 成本位,FDE 单价位,FDE 取整位,FDE 聚合位,FDE 串行位,FDE 并行位,FDE 合并位,FDE 档案位,FDE 条目位,FDE 属性位,FDE 压缩位,FDE 解压位,FDE 保留位,FDE 过期位,FDE 淘汰位,FDE 幂等位,FDE 版本位,FDE 快照位,FDE 排查位,FDE 报错位,FDE 绕法位,FDE 步骤位,FDE 配置位,FDE 参数位,FDE 交付位,FDE 现场位,FDE 客户位,FDE 平台位,FDE 证据位,FDE 结论位,FDE 局限位,FDE 例外位,FDE 门槛位,FDE 周期位,FDE 频次位,FDE 顺序位,FDE 清单位,FDE 观测位,FDE 告警位,FDE 降级位,FDE 熔断位,FDE 核基数,FDE 核口径,FDE 核样本,FDE 核区间,FDE 核中位,FDE 核均值,FDE 核来源,FDE 核署名,FDE 核定义,FDE 核边界,FDE 核例外,FDE 核增幅,FDE 核降幅,FDE 核倍数,FDE 核缺口,FDE 核偏差,FDE 核频次,FDE 核占比,FDE 核周期,FDE 核门槛,FDE 核原文,FDE 核公告,FDE 核方法,FDE 核规律,FDE 核历史,FDE 核标题,FDE 核摘要,FDE 核索引,FDE 核锚点,FDE 核候选,FDE 核选题,FDE 核配额,FDE 核清单,FDE 核结论,FDE 核证据,FDE 核因果,FDE 核外推,FDE 核量级,FDE 核预算,FDE 核采购,FDE 核交付,FDE 核客户,FDE 核场景,FDE 核地区,FDE 核行业,FDE 核编制,FDE 核转化,FDE 核留存,FDE 核时长,FDE 核梯队,FDE 核品牌,FDE 核定价,FDE 核条款,FDE 核数据,FDE 核模型,FDE 核现场,FDE 核培训,FDE 核资产,FDE 核供应,FDE 核议价,FDE 查基数,FDE 查口径,FDE 查样本,FDE 查区间,FDE 查中位,FDE 查均值,FDE 查来源,FDE 查署名,FDE 查定义,FDE 查边界,FDE 查例外,FDE 查增幅,FDE 查降幅,FDE 查倍数,FDE 查缺口,FDE 查偏差,FDE 查频次,FDE 查占比,FDE 查周期,FDE 查门槛,FDE 查原文,FDE 查公告,FDE 查方法,FDE 查规律,FDE 查历史,FDE 查标题,FDE 查摘要,FDE 查索引,FDE 查锚点,FDE 查候选,FDE 查选题,FDE 查配额,FDE 查清单,FDE 查结论,FDE 查证据,FDE 查因果,FDE 查外推,FDE 查量级,FDE 查预算,FDE 查采购,FDE 查交付,FDE 查客户,FDE 查场景,FDE 查地区,FDE 查行业,FDE 查编制,FDE 查转化,FDE 查留存,FDE 查时长,FDE 查梯队,FDE 查品牌,FDE 查定价,FDE 查条款,FDE 查数据,FDE 查模型,FDE 查现场,FDE 查培训,FDE 查资产,FDE 查供应,FDE 查议价,FDE 量基数,FDE 量口径,FDE 量样本,FDE 量区间,FDE 量中位,FDE 量均值,FDE 量来源,FDE 量署名,FDE 量定义,FDE 量边界,FDE 量例外,FDE 量增幅,FDE 量降幅,FDE 量倍数,FDE 量缺口,FDE 量偏差,FDE 量频次,FDE 量占比,FDE 量周期,FDE 量门槛,FDE 量原文,FDE 量公告,FDE 量方法,FDE 量规律,FDE 量历史,FDE 量标题,FDE 量摘要,FDE 量索引,FDE 量锚点,FDE 量候选,FDE 量选题,FDE 量配额,FDE 量清单,FDE 量结论,FDE 量证据,FDE 量因果,FDE 量外推,FDE 量量级,FDE 量预算,FDE 量采购,FDE 量交付,FDE 量客户,FDE 量场景,FDE 量地区,FDE 量行业,FDE 量编制,FDE 量转化,FDE 量留存,FDE 量时长,FDE 量梯队,FDE 量品牌,FDE 量定价,FDE 量条款,FDE 量数据,FDE 量模型,FDE 量现场,FDE 量培训,FDE 量资产,FDE 量供应,FDE 量议价,FDE 比基数,FDE 比口径,FDE 比样本,FDE 比区间,FDE 比中位,FDE 比均值,FDE 比来源,FDE 比署名,FDE 比定义,FDE 比边界,FDE 比例外,FDE 比增幅,FDE 比降幅,FDE 比倍数,FDE 比缺口,FDE 比偏差,FDE 比频次,FDE 比占比,FDE 比周期,FDE 比门槛,FDE 比原文,FDE 比公告,FDE 比方法,FDE 比规律,FDE 比历史,FDE 比标题,FDE 比摘要,FDE 比索引,FDE 比锚点,FDE 比候选,FDE 比选题,FDE 比配额,FDE 比清单,FDE 比结论,FDE 比证据,FDE 比因果,FDE 比外推,FDE 比量级,FDE 比预算,FDE 比采购,FDE 比交付,FDE 比客户,FDE 比场景,FDE 比地区,FDE 比行业,FDE 比编制,FDE 比转化,FDE 比留存,FDE 比时长,FDE 比梯队,FDE 比品牌,FDE 比定价,FDE 比条款,FDE 比数据,FDE 比模型,FDE 比现场,FDE 比培训,FDE 比资产,FDE 比供应,FDE 比议价,FDE 读基数,FDE 读口径,FDE 读样本,FDE 读区间,FDE 读中位,FDE 读均值,FDE 读来源,FDE 读署名,FDE 读定义,FDE 读边界,FDE 读例外,FDE 读增幅,FDE 读降幅,FDE 读倍数,FDE 读缺口,FDE 读偏差,FDE 读频次,FDE 读占比,FDE 读周期,FDE 读门槛,FDE 读原文,FDE 读公告,FDE 读方法,FDE 读规律,FDE 读历史,FDE 读标题,FDE 读摘要,FDE 读索引,FDE 读锚点,FDE 读候选,FDE 读选题,FDE 读配额,FDE 读清单,FDE 读结论,FDE 读证据,FDE 读因果,FDE 读外推,FDE 读量级,FDE 读预算,FDE 读采购,FDE 读交付,FDE 读客户,FDE 读场景,FDE 读地区,FDE 读行业,FDE 读编制,FDE 读转化,FDE 读留存,FDE 读时长,FDE 读梯队,FDE 读品牌,FDE 读定价,FDE 读条款,FDE 读数据,FDE 读模型,FDE 读现场,FDE 读培训,FDE 读资产,FDE 读供应,FDE 读议价,FDE 算基数,FDE 算口径,FDE 算样本,FDE 算区间,FDE 算中位,FDE 算均值,FDE 算来源,FDE 算署名,FDE 算定义,FDE 算边界,FDE 算例外,FDE 算增幅,FDE 算降幅,FDE 算倍数,FDE 算缺口,FDE 算偏差,FDE 算频次,FDE 算占比,FDE 算周期,FDE 算门槛,FDE 算原文,FDE 算公告,FDE 算方法,FDE 算规律,FDE 算历史,FDE 算标题,FDE 算摘要,FDE 算索引,FDE 算锚点,FDE 算候选,FDE 算选题,FDE 算配额,FDE 算清单,FDE 算结论,FDE 算证据,FDE 算因果,FDE 算外推,FDE 算量级,FDE 算预算,FDE 算采购,FDE 算交付,FDE 算客户,FDE 算场景,FDE 算地区,FDE 算行业,FDE 算编制,FDE 算转化,FDE 算留存,FDE 算时长,FDE 算梯队,FDE 算品牌,FDE 算定价,FDE 算条款,FDE 算数据,FDE 算模型,FDE 算现场,FDE 算培训,FDE 算资产,FDE 算供应,FDE 算议价,FDE 标基数,FDE 标口径,FDE 标样本,FDE 标区间,FDE 标中位,FDE 标均值,FDE 标来源,FDE 标署名,FDE 标定义,FDE 标边界,FDE 标例外,FDE 标增幅,FDE 标降幅,FDE 标倍数,FDE 标缺口,FDE 标偏差,FDE 标频次,FDE 标占比,FDE 标周期,FDE 标门槛,FDE 标原文,FDE 标公告,FDE 标方法,FDE 标规律,FDE 标历史,FDE 标标题,FDE 标摘要,FDE 标索引,FDE 标锚点,FDE 标候选,FDE 标选题,FDE 标配额,FDE 标清单,FDE 标结论,FDE 标证据,FDE 标因果,FDE 标外推,FDE 标量级,FDE 标预算,FDE 标采购,FDE 标交付,FDE 标客户,FDE 标场景,FDE 标地区,FDE 标行业,FDE 标编制,FDE 标转化,FDE 标留存,FDE 标时长,FDE 标梯队,FDE 标品牌,FDE 标定价,FDE 标条款,FDE 标数据,FDE 标模型,FDE 标现场,FDE 标培训,FDE 标资产,FDE 标供应,FDE 标议价,FDE 记基数,FDE 记口径,FDE 记样本,FDE 记区间,FDE 记中位,FDE 记均值,FDE 记来源,FDE 记署名,FDE 记定义,FDE 记边界,FDE 记例外,FDE 记增幅,FDE 记降幅,FDE 记倍数,FDE 记缺口,FDE 记偏差,FDE 记频次,FDE 记占比,FDE 记周期,FDE 记门槛,FDE 记原文,FDE 记公告,FDE 记方法,FDE 记规律,FDE 记历史,FDE 记标题,FDE 记摘要,FDE 记索引,FDE 记锚点,FDE 记候选,FDE 记选题,FDE 记配额,FDE 记清单,FDE 记结论,FDE 记证据,FDE 记因果,FDE 记外推,FDE 记量级,FDE 记预算,FDE 记采购,FDE 记交付,FDE 记客户,FDE 记场景,FDE 记地区,FDE 记行业,FDE 记编制,FDE 记转化,FDE 记留存,FDE 记时长,FDE 记梯队,FDE 记品牌,FDE 记定价,FDE 记条款,FDE 记数据,FDE 记模型,FDE 记现场,FDE 记培训,FDE 记资产,FDE 记供应,FDE 记议价,FDE 留基数,FDE 留口径,FDE 留样本,FDE 留区间,FDE 留中位,FDE 留均值,FDE 留来源,FDE 留署名,FDE 留定义,FDE 留边界,FDE 留例外,FDE 留增幅,FDE 留降幅,FDE 留倍数,FDE 留缺口,FDE 留偏差,FDE 留频次,FDE 留占比,FDE 留周期,FDE 留门槛,FDE 留原文,FDE 留公告,FDE 留方法,FDE 留规律,FDE 留历史,FDE 留标题,FDE 留摘要,FDE 留索引,FDE 留锚点,FDE 留候选,FDE 留选题,FDE 留配额,FDE 留清单,FDE 留结论,FDE 留证据,FDE 留因果,FDE 留外推,FDE 留量级,FDE 留预算,FDE 留采购,FDE 留交付,FDE 留客户,FDE 留场景,FDE 留地区,FDE 留行业,FDE 留编制,FDE 留转化,FDE 留留存,FDE 留时长,FDE 留梯队,FDE 留品牌,FDE 留定价,FDE 留条款,FDE 留数据,FDE 留模型,FDE 留现场,FDE 留培训,FDE 留资产,FDE 留供应,FDE 留议价,FDE 补基数,FDE 补口径,FDE 补样本,FDE 补区间,FDE 补中位,FDE 补均值,FDE 补来源,FDE 补署名,FDE 补定义,FDE 补边界,FDE 补例外,FDE 补增幅,FDE 补降幅,FDE 补倍数,FDE 补缺口,FDE 补偏差,FDE 原始来源: https://aws.amazon.com/blogs/database/megabytes-in-milliseconds-how-firetv-uses-parallel-queries-and-vertical-partitioning-to-serve-millions-of-customers-in-amazon-dynamodb/ https://aws.amazon.com/blogs/database/use-vertical-partitioning-to-scale-data-efficiently-in-amazon-dynamodb/ https://aws.amazon.com/blogs/database/part-1-scaling-dynamodb-how-partitions-hot-keys-and-split-for-heat-impact-performance/