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Posted to user@flink.apache.org by Ilya Karpov <id...@gmail.com> on 2019/03/26 07:21:14 UTC

What is Flinks primary API language?

Hello,
our dev-team is choosing a language for developing Flink jobs. Most likely that we will use flink-streaming api (at least in the very beginning). Because of Spark jobs developing experience we had before the choice for now is scala-api. However recently I’ve found a ticket(https://issues.apache.org/jira/browse/FLINK-11063 <https://issues.apache.org/jira/browse/FLINK-11063>) with discussion(https://cwiki.apache.org/confluence/display/FLINK/Flink+Improvement+Proposals <https://cwiki.apache.org/confluence/display/FLINK/Flink+Improvement+Proposals>) where java-api can become the first class citizen to overcome shortcomings java/scala interoperability, and another one(https://issues.apache.org/jira/browse/FLINK-6756 <https://issues.apache.org/jira/browse/FLINK-6756>) about absence of api methods in scala-api. That makes me think that java-api becomes a prior. We are both comfortable with java and scala, but we want to implement Flink jobs and support utilities dependent on api that progresses faster. Is java-api such a one? Is java the main implementation language of Flink internals and api, and scala is a (or gravitates to be) java-api wrapper?

Re: What is Flinks primary API language?

Posted by Ilya Karpov <id...@gmail.com>.

Thanks Yun Tang, we will keep that in mind!

> 26 марта 2019 г., в 11:27, Yun Tang <my...@live.com> написал(а):
> 
> Hi Llya
> 
> I believe Java is the main implementation language of Flink internals, flink-core is the kernel module and implemented in Java.
> 
> What's more:
> FILP6: Replace Scala implemented JobManager.scala and TaskManager.scala to new JobMaster.java and TaskExecutor.java
> FILP32: Make flink-table Scala free.
> 
> But for API level, from my point of view, I have never heard any plan to stop supporting Scala.
> 
> Best
> Yun Tang
> 
> 
> 
> From: Ilya Karpov <id...@gmail.com>
> Sent: Tuesday, March 26, 2019 15:21
> To: user@flink.apache.org
> Subject: What is Flinks primary API language?
>  
> Hello,
> our dev-team is choosing a language for developing Flink jobs. Most likely that we will use flink-streaming api (at least in the very beginning). Because of Spark jobs developing experience we had before the choice for now is scala-api. However recently I’ve found a ticket(https://issues.apache.org/jira/browse/FLINK-11063 <https://issues.apache.org/jira/browse/FLINK-11063>) with discussion(https://cwiki.apache.org/confluence/display/FLINK/Flink+Improvement+Proposals <https://cwiki.apache.org/confluence/display/FLINK/Flink+Improvement+Proposals>) where java-api can become the first class citizen to overcome shortcomings java/scala interoperability, and another one(https://issues.apache.org/jira/browse/FLINK-6756 <https://issues.apache.org/jira/browse/FLINK-6756>) about absence of api methods in scala-api. That makes me think that java-api becomes a prior. We are both comfortable with java and scala, but we want to implement Flink jobs and support utilities dependent on api that progresses faster. Is java-api such a one? Is java the main implementation language of Flink internals and api, and scala is a (or gravitates to be) java-api wrapper?

Re: What is Flinks primary API language?

Posted by Yun Tang <my...@live.com>.

Hi Llya

I believe Java is the main implementation language of Flink internals, flink-core is the kernel module and implemented in Java.

What's more:
FILP6: Replace Scala implemented JobManager.scala and TaskManager.scala to new JobMaster.java and TaskExecutor.java
FILP32: Make flink-table Scala free.

But for API level, from my point of view, I have never heard any plan to stop supporting Scala.

Best
Yun Tang



________________________________
From: Ilya Karpov <id...@gmail.com>
Sent: Tuesday, March 26, 2019 15:21
To: user@flink.apache.org
Subject: What is Flinks primary API language?

Hello,
our dev-team is choosing a language for developing Flink jobs. Most likely that we will use flink-streaming api (at least in the very beginning). Because of Spark jobs developing experience we had before the choice for now is scala-api. However recently I’ve found a ticket(https://issues.apache.org/jira/browse/FLINK-11063) with discussion(https://cwiki.apache.org/confluence/display/FLINK/Flink+Improvement+Proposals) where java-api can become the first class citizen to overcome shortcomings java/scala interoperability, and another one(https://issues.apache.org/jira/browse/FLINK-6756) about absence of api methods in scala-api. That makes me think that java-api becomes a prior. We are both comfortable with java and scala, but we want to implement Flink jobs and support utilities dependent on api that progresses faster. Is java-api such a one? Is java the main implementation language of Flink internals and api, and scala is a (or gravitates to be) java-api wrapper?