What is Flinks primary API language?

[Ilya Karpov]

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?

Re: What is Flinks primary API language?

[Yun Tang]

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 
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?

Re: What is Flinks primary API language?

[Ilya Karpov]

Thanks Yun Tang, we will keep that in mind!

> 26 марта 2019 г., в 11:27, Yun Tang  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 
> 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?