Hbase secondary index + CDH + Lily

... 1. Change the table structure, allowing copying existing tables Disable 'tableName' Alter 'tableName', {NAME => 'fn', REPLICATION_SCOPE =>1} Enable 'tableName' Non-existent table Create ‘table‘,{NAME =>‘cf’, REPLICATION_SCOPE =>1} #1 indicates that replication is enabled, 0...


Big data storage, computing, application, visualization, and basic overview of data are here.

... The era of the future, must be the era of data. In the future, everything is recorded, everything is analyzed, and data will exist as assets. The relevant knowledge is as follows: 一, first said that various data storage data is a very general concept, but the first reaction in our minds...


Tone mapping evolution

... In recent years, with the development of shooting equipment, rendering methods and display devices, HDR will slowly become standard. Cameras and cameras can capture the effects of HDR, and HDR images can be produced during rendering. If the content needs to be displayed on the LDR...


Dubbo study summary (6) - Dubbo open source status and future planning

... This article is based on Zhu Yong teacher's speech at the Shanghai Dubbo Salon, intended to show you the most authentic and best-handed salon technology dry goods. 前言 大家好, I am very honored to have the opportunity to share this with you. Let me introduce myself first. My name is Zhu...


Elasticsearch 2.3.1 stand-alone and cluster installation 2 in 1 and elasticsearch use

... Features: 1. Inverted index (that is, indexed after word segmentation) 2. The installation process is very simple, you can use the decompression 3. There is no clear master node, build a cluster to add nodes (cluster is best 3 or more nodes) 4. The query is very fast The installation...


Gini coefficient calculation: sql (hive) implementation

... by the approximate method, how to calculate the Gini coefficient in sql. ------------------------------------------------------------------------------------------------- How to implement the Gini coefficient calculation in Python, you can check out my other article. -------------------...


Professional terminology nouns

... 一, RPC @RPC (Remote Procedure Call) - Remote procedure call, which is a protocol for requesting services from a remote computer program over a network without the need to understand the underlying network technology. The RPC protocol assumes that certain transport protocols exist, such...


The use of Model/View model in QT5

... This article does not explain the primary use of model/view qt introduces the Model/view structure, in order to improve the efficiency of big data refreshing such as traditional QTabelWidget. Since it is designed for high-efficiency display, we need to align the design ideas to...


On the elasticsearch and mysql data insertion

... <1>elasticsearch index is like mysql database; <2>elasticsearch type is like mysql table. <demand> When performing data insertion, if there is duplicate data insertion, it needs to be overwritten instead of appending: <3>elasticsearch's insertion method supports...


Dongfang Guoxin's practice and thinking on building a container cloud platform based on kubernetes_Kubernetes Chinese Community

... 分享客:Cui Dong This time, I share the theme of "Oriental Guoxin's practice and thinking on building container cloud platform based on Kubernetes 》. Let's talk about the background first. The software deployment method before Guoxin is to find a machine, throw the war package or the jar...