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Introduction

Linkis builds a layer of computation middleware between upper applications and underlying engines. By using standard interfaces such as REST/WS/JDBC provided by Linkis, the upper applications can easily access the underlying engines such as MySQL/Spark/Hive/Presto/Flink, etc., and achieve the intercommunication of user resources like unified variables, scripts, UDFs, functions and resource files at the same time.

As a computation middleware, Linkis provides powerful connectivity, reuse, orchestration, expansion, and governance capabilities. By decoupling the application layer and the engine layer, it simplifies the complex network call relationship, and thus reduces the overall complexity and saves the development and maintenance costs as well.

Since the first release of Linkis in 2019, it has accumulated more than 700 trial companies and 1000+ sandbox trial users, which involving diverse industries, from finance, banking, tele-communication, to manufactory, internet companies and so on. Lots of companies have already used Linkis as a unified entrance for the underlying computation and storage engines of the big data platform.

Features

• Support for diverse underlying computation storage engines : Spark, Hive, Python, Shell, Flink, JDBC, Pipeline, Sqoop, OpenLooKeng, Presto, ElasticSearch, Trino, SeaTunnel, etc.;

• Support for diverse language : SparkSQL, HiveSQL, Python, Shell, Pyspark, Scala, JSON and Java;

• Powerful computing governance capability : It can provide task routing, load balancing, multi-tenant, traffic control, resource control and other capabilities based on multi-level labels;

• Support full stack computation/storage engine : The ability to receive, execute and manage tasks and requests for various compute and storage engines, including offline batch tasks, interactive query tasks, real-time streaming tasks and data lake tasks;

• Unified context service : supports cross-user, system and computing engine to associate and manage user and system resource files (JAR, ZIP, Properties, etc.), result sets, parameter variables, functions, UDFs, etc., one setting, automatic reference everywhere;

• Unified materials : provides system and user level material management, can share and flow, share materials across users, across systems;

• Unified data source management : provides the ability to add, delete, check and change information of Hive, ElasticSearch, Mysql, Kafka, MongoDB and other data sources, version control, connection test, and query metadata information of corresponding data sources;

• Error code capability : provides error codes and solutions for common errors of tasks, which is convenient for users to locate problems by themselves;

Engine Type

Download

Please go to the Linkis Releases Page to download a compiled distribution or a source code package of Linkis.

Compile and Deploy

For more detailed guidance see:

• [Backend Compile]
• [Management Console Build]

Note: If you want use `-Dlinkis.build.web=true` to build  linkis-web image, you need to compile linkis-web first.

## compile backend
### Mac OS/Linux

# 1. When compiling for the first time, execute the following command first
./mvnw -N install

# 2. make the linkis distribution package
# - Option 1: make the linkis distribution package only
./mvnw clean install -Dmaven.javadoc.skip=true -Dmaven.test.skip=true

# - Option 2: make the linkis distribution package and docker image
#   - Option 2.1: image without mysql jdbc jars
./mvnw clean install -Pdocker -Dmaven.javadoc.skip=true -Dmaven.test.skip=true
#   - Option 2.2: image with mysql jdbc jars
./mvnw clean install -Pdocker -Dmaven.javadoc.skip=true -Dmaven.test.skip=true -Dlinkis.build.with.jdbc=true

# - Option 3: linkis distribution package and docker image (included web)
./mvnw clean install -Pdocker -Dmaven.javadoc.skip=true -Dmaven.test.skip=true -Dlinkis.build.web=true

# - Option 4: linkis distribution package and docker image (included web and ldh (hadoop all in one for test))
./mvnw clean install -Pdocker -Dmaven.javadoc.skip=true -Dmaven.test.skip=true -Dlinkis.build.web=true -Dlinkis.build.ldh=true -Dlinkis.build.with.jdbc=true

### Windows
mvnw.cmd -N install
mvnw.cmd clean install -Dmaven.javadoc.skip=true -Dmaven.test.skip=true

## compile web
cd linkis/linkis-web
npm install
npm run build

Bundled with MySQL JDBC Driver

Due to the MySQL licensing restrictions, the MySQL Java Database Connectivity (JDBC) driver is not bundled with the official released linkis image by default. However, at current stage, linkis still relies on this library to work properly. To solve this problem, we provide a script which can help to creating a custom image with mysql jdbc from the official linkis image by yourself, the image created by this tool will be tagged as linkis:with-jdbc by default.

$> LINKIS_IMAGE=linkis:1.3.1 
$> ./linkis-dist/docker/scripts/make-linkis-image-with-mysql-jdbc.sh

Please refer to Quick Deployment to do the deployment.

Examples and Guidance

• User Manual
• Engine Usage Documents
• API Documents

Documentation & Vedio

• The documentation of linkis is in Linkis-Website Git Repository
• Meetup videos on Bilibili

Architecture

Linkis services could be divided into three categories: computation governance services, public enhancement services and microservice governance services

• The computation governance services, support the 3 major stages of processing a task/request: submission -> preparation -> execution
• The public enhancement services, including the material library service, context service, and data source service
• The microservice governance services, including Spring Cloud Gateway, Eureka and Open Feign

Below is the Linkis architecture diagram. You can find more detailed architecture docs in Linkis-Doc/Architecture.

Contributing

Contributions are always welcomed, we need more contributors to build Linkis together. either code, or doc, or other supports that could help the community.
For code and documentation contributions, please follow the contribution guide.

Contact Us

• Any questions or suggestions please kindly submit an issue.
• By mail dev@linkis.apache.org
• You can scan the QR code below to join our WeChat group to get more immediate response

Who is Using Linkis

We opened an issue [Who is Using Linkis] for users to feedback and record who is using Linkis.
Since the first release of Linkis in 2019, it has accumulated more than 700 trial companies and 1000+ sandbox trial users, which involving diverse industries, from finance, banking, tele-communication, to manufactory, internet companies and so on.