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https://issues.apache.org/jira/browse/BEAM-9629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17121604#comment-17121604
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Kenneth Knowles commented on BEAM-9629:
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This issue is assigned but has not received an update in 30 days so it has been 
labeled "stale-assigned". If you are still working on the issue, please give an 
update and remove the label. If you are no longer working on the issue, please 
unassign so someone else may work on it. In 7 days the issue will be 
automatically unassigned.

> JdbcIO seems to run out of connections in the connection pool and freezes 
> pipeline
> ----------------------------------------------------------------------------------
>
>                 Key: BEAM-9629
>                 URL: https://issues.apache.org/jira/browse/BEAM-9629
>             Project: Beam
>          Issue Type: Bug
>          Components: io-java-jdbc
>    Affects Versions: 2.19.0
>         Environment: Dataflow, Direct Runner on macOS Catalina.
>            Reporter: Boris Shilov
>            Assignee: Ismaël Mejía
>            Priority: P2
>              Labels: performance, stale-assigned
>             Fix For: 2.23.0
>
>
> Greetings,
> I am using JdbcIO via the Scala wrappers provided in the Scio project. I am 
> trying to read a few dozen tables in parallel from MySQL, but above 8 
> concurrent SELECT operations the pipeline freezes. With help of the Scio 
> maintainers we've been able to isolate the issue as likely originating in 
> JdbcIO running out of connections in the connection pool and idling 
> indefinitely. The issue occurs both on the Direct Runner and Dataflow.
> Please see linked issue for more context: 
> https://github.com/spotify/scio/issues/2774



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