-
Schema Evolution
Schema Evolution on Write Type Promotions Schema Evolution on read Adding Columns Altering Columns Deleting Columns Renaming columns Schema Evolution in Action Related Reso... -
Why JDO?
The majority of applications need to persist (or store) data during their lifecycle. There are many ways of doing this with an application written in Java. If your datastore is ... -
HdfsFile
Support Those Engines Key Features Description Supported DataSource Info Sink Options Tips Task Example Simple: For orc file format simple config For text file format with ... -
3. ACL Management Guide
ACL Management Guide ACL Management Guide Authorization Modes Three primary modes for Kyuubi authorization are available by Submarine Spark Security : Storage-Based Authoriza... -
Structure of the book
The book is broken down into small “recipes” that aim to demonstrate a single concept at a time. Chapter installation provides instructions on how to install the necessary softwa... -
数据推送
OpenTSDB 协议 RemoteWrite 协议 推给客户端 在 采集器 章节可以看出，夜莺支持多种数据接收的接口（由 n9e-server 实现，推送数据就是推给 n9e-server 的 19000 端口），包括 OpenTSDB、Open-Falcon、RemoteWrite、Datadog 等协议。这节我们以 OpenTSDB 的数据接... -
Function
always comparator compose construct curry useWith flip groupBy identity invoker nAry once pipe tap binary unary ap empty of constructN converge always a → (... -
Object Retrieval
Retrieve an object from its identity Retrieve an object based on its Extent Retrieve an object based on a query criteria Any application will require access to persisted object... -
自监控
夜莺 5.x 版本有 n9e-webapi 和 n9e-server 两个模块，这俩模块都暴露了 /metrics 接口，所以，夜莺自身组件的监控，就有两个做法，做法一： 搞一个单独的 Prometheus，抓取 n9e-webapi 和 n9e-server 的 /metrics 的数据 在这个单独的 Prometheus 里配置 up 指标的告... -
List
all any append concat drop zipWith zip xprod uniq filter find flatten head indexOf join lastIndexOf map nth pluck prepend range reduce reduceRight reject re...
