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https://issues.apache.org/jira/browse/BEAM-881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15629499#comment-15629499
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Francis UPTON commented on BEAM-881:
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I think the issue we are trying to address here is to provide a means of having 
IOs and generic Ptransforms all being able to work together without 
point-to-point conversions. One way to do this is use Avro IndexRecords. 
However there are others. The important thing is provide a means to get to a 
common interoperable format that supports hierarchical data. Without this, all 
transformations between IOs and PTransform components will have to be 
point-to-point and this will not scale.

> Provide a PTransform in IOs providing a "standard" Avro IndexedRecord
> ---------------------------------------------------------------------
>
>                 Key: BEAM-881
>                 URL: https://issues.apache.org/jira/browse/BEAM-881
>             Project: Beam
>          Issue Type: New Feature
>          Components: sdk-java-extensions
>            Reporter: Jean-Baptiste Onofré
>            Assignee: Jean-Baptiste Onofré
>
> Now, each IO is using a different data format. For instance, the 
> {{JmsIO.Read}} provides a {{PCollection}} of {{JmsRecord}} (and 
> {{JmsIO.Write}} expects also a {{JmsRecord}}), {{KafkaIO.Read}} provides a 
> {{PCollection}} of {{KafkaRecord}}.
> It could appear a bit "complex" for users to manipulate such kind of data 
> format: some users may expect kind of standard format.
> Without modifying the existing IO, we could add a {{PTransform}} (as part of 
> the IO) that an user can optionally use. This transform will convert the IO 
> data format (let say {{JmsRecord}} for instance) to a standard Avro 
> {{IndexedRecord}}.



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