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https://github.com/nextbreakpoint/flink-client

Java library for managing Apache Flink via the Monitoring REST API
https://github.com/nextbreakpoint/flink-client

flink java openapi

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Java library for managing Apache Flink via the Monitoring REST API

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README 

        
# flink-client



This library provides a Java client for managing Apache Flink via the [Monitoring REST API](https://ci.apache.org/projects/flink/flink-docs-stable/monitoring/rest_api.html).



The client is generated with [Swagger Codegen](https://swagger.io/tools/swagger-codegen/) from an OpenAPI specification file.



## License



The library is distributed under the terms of BSD 3-Clause License.



    Copyright (c) 2019-2021, Andrea Medeghini

    All rights reserved.

    

    Redistribution and use in source and binary forms, with or without

    modification, are permitted provided that the following conditions are met:

    

    * Redistributions of source code must retain the above copyright notice, this

      list of conditions and the following disclaimer.

    

    * Redistributions in binary form must reproduce the above copyright notice,

      this list of conditions and the following disclaimer in the documentation

      and/or other materials provided with the distribution.

    

    * Neither the name of the library nor the names of its

      contributors may be used to endorse or promote products derived from

      this software without specific prior written permission.

    

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE

    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

    OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.



## How to get the binaries



The library is available in Maven Central Repository, and GitHub.



If you are using Maven, add this dependency to your POM:



    

        com.nextbreakpoint

        com.nextbreakpoint.flinkclient

        1.0.4

            



## How to generate the code



Generate the code from the [OpenAPI specification](https://github.com/nextbreakpoint/flink-client/blob/master/flink-openapi.yaml) using Maven:



    mvn clean compile



## How to build the library



Build the library using Maven:



    mvn clean package



## How to run the tests



Make sure you have Docker installed and create the required bridge network:



    docker network create flink-test 

 

Run the tests using Maven:



    mvn clean verify



## Documentation



Create the Flink client:



    FlinkApi api = new FlinkApi();



Configure host and port of the server:



    api.getApiClient().setBasePath("http://localhost:8081");



Configure socket timeouts:



    api.getApiClient().getHttpClient().setConnectTimeout(20000, TimeUnit.MILLISECONDS)

    api.getApiClient().getHttpClient().setWriteTimeout(30000, TimeUnit.MILLISECONDS)

    api.getApiClient().getHttpClient().setReadTimeout(30000, TimeUnit.MILLISECONDS)



Optionally enable debugging:



    api.getApiClient().setIsDebugging(true)



Get Flink cluster configuration:



    DashboardConfiguration config = api.showConfig();



Show list of uploaded jars:



    JarListInfo jars = api.listJars();



Upload a jar which contain a Flink job:



    JarUploadResponseBody result = api.uploadJar(new File("flink-job.jar"));



Run an uploaded jar which some arguments:



    JarRunResponseBody response = api.runJar("bf4afb3b-d662-435e-b465-5ddb40d68379_flink-job.jar", true, null, "--INPUT A --OUTPUT B", null, "your-main-class", null);



Get status of all jobs:



    JobIdsWithStatusOverview jobs = api.getJobs();



Get details of a job:



    JobDetailsInfo details = api.getJobDetails("f370f5421e5254eed8d6fc6673829c83");



Terminate a job:



    api.terminateJob("f370f5421e5254eed8d6fc6673829c83", "cancel");



For all the remaining operations see documentation of Monitoring REST API or see [OpenAPI specification file](https://github.com/nextbreakpoint/flink-client/blob/master/flink-openapi.yaml).



## Flink compatibility



The current version of the library has been tested against Flink 1.10.0, but the library is known to work with older versions.   

The library is compatible with Flink Monitoring REST API v1, which didn't change for long time (at least since Flink 1.7).

The library should be compatible with newer versions too, unless a breaking change is introduced in the Flink Monitoring REST API. 



## Known limitations



The library has integration tests with a code coverage of 90%. 

Few endpoints don't have tests and not all fields in the responses are currently verified.