Hi Daniel,

The answer to you original question is you can just keyBy[1] by e.g. the machineId and then computations on KeyedStream are applied independently for each key.



[1] https://ci.apache.org/projects/flink/flink-docs-release-1.7/dev/stream/operators/#datastream-transformations

On 31/01/2019 12:55, Daniel Krenn wrote:
I don't get what happened here. Did Selvaraj just hijack this question? Or what is going on?

Am Di., 29. Jan. 2019 um 17:01 Uhr schrieb Selvaraj chennappan <selvarajchennappan@gmail.com>:
I think there is misunderstanding . I want to compare raw json and transformed record . 
Hence I need two consumer and merge the stream for comparison.
I have  pipeline defined . pipeline does source(kafka) ,transformation,dedup and persisting to DB .

Before reaching to DB task lots of transformation is applied on the pipeline  Therefore want to validate the record with raw json message which is available in kafka  with the transformed record.

Hence I want to know How to do that in flink. 

On Tue, Jan 29, 2019 at 8:54 PM Puneet Kinra <puneet.kinra@customercentria.com> wrote:
Hi Selvaraj

In your pojo add data member as status or something like that,now set it error in case it is invaild .pass the output of flatmap
to split opertor there you can split the stream 

On Tue, Jan 29, 2019 at 6:39 PM Selvaraj chennappan <selvarajchennappan@gmail.com> wrote:
UseCase:- We have kafka consumer to read messages(json ) then it applies to flatmap  for transformation based on the rules ( rules are complex ) and convert it to pojo .
We want to verify the record(pojo) is valid by checking field by field of that record .if record is invalid due to transformation rules  then move to error topic otherwise send to DB.

I thought of Implementing like adding another consumer to read json message  and compare json message attributes with transformed record attributes . 

Hence I need to join/coprocess these two streams to validate then decide whether persist to db or sending to error topic.

Please let me know if you need more information.

On Tue, Jan 29, 2019 at 6:21 PM miki haiat <miko5054@gmail.com> wrote:
Im not sure if i got your question correctly, can you elaborate more on your use case 


Selvaraj C


Puneet Kinra


Selvaraj C