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https://issues.apache.org/jira/browse/BEAM-1323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16046775#comment-16046775
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Stephen Sisk commented on BEAM-1323:
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+1 to eugene's comment. I don't believe we can reliably do this in jdbc IO in a
way that works across databases - thus, any implementation of this proposal
would likely result in bad experiences for many users.
Unless you have a concrete proposal that we can prove works across many
databases, I think we should close this issue.
> Add parallelism/splitting in JdbcIO
> -----------------------------------
>
> Key: BEAM-1323
> URL: https://issues.apache.org/jira/browse/BEAM-1323
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-extensions
> Reporter: Jean-Baptiste Onofré
> Assignee: Jean-Baptiste Onofré
>
> Now, the JDBC IO is basically a {{DoFn}} executed with a {{ParDo}}. So, it
> means that parallelism is "limited" and executed on one executor.
> We can imagine to create several JDBC {{BoundedSource}}s splitting the SQL
> query in subset (for instance using row id paging or any "splitting/limit"
> we can figure based on the original SQL query) (something similar to what
> Sqoop is doing).
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