elastic_ L01_ summary

Reading guide

This article mainly introduces Elasticsearch What is it? 、 What advantages does it have 、 Application scenarios and development history .

1、 What is it? ？

Elasticsearch It's based on Lunece Open source distributed real-time search and analysis engine

2、 advantage

• Good query performance
• Distributed design , Good scalability
• Support the integration of multiple languages
• A complete ecosystem and a large number of examples of Internet companies

3、 Application scenarios

• Search for
• Log analysis
• Index analysis
• Safety analysis

4、 development history

0.4—2010
1.0—2014
2.0—2015

5.0—2016

• Lucene 6.x Support for , Half the disk space

6.x—2017

• Luncene 7.x
• new function ： Cross cluster replication ; Index Lifecycle Management ;SQL Support for
• More friendly upgrades and data migration
• performance optimization ： Excellent new method for storing sparse fields , Reduced storage success , Sort when indexing , Speed up sorting query performance

7.x—2019

• Lucene 8.0
• Officially abolish multiple indexes under a single index Type Support for
• Major improvement ：7.1 Start ,Security Features are free to use
• ECK-Elasticsearch Operator on Kubernates
• new function ：Feature-Complete High Level EST Client
• performance optimization ： default Primary Shard Number by 5 Change it to 1, avoid Over Sharding; Faster Top K