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https://issues.apache.org/jira/browse/BEAM-9629?focusedWorklogId=456765&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-456765
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ASF GitHub Bot logged work on BEAM-9629:
----------------------------------------
Author: ASF GitHub Bot
Created on: 09/Jul/20 19:00
Start Date: 09/Jul/20 19:00
Worklog Time Spent: 10m
Work Description: lukecwik opened a new pull request #12209:
URL: https://github.com/apache/beam/pull/12209
* Make the default max connections to be unlimited. This mirrors the 2.17
and earlier behavior since we used to create one DataSource per execution
thread (and hence one connection).
* Move connection fetching to @ProcessElement to not hold a connection for
empty bundles.
* Make sure that finalize() closes the connection so that it is returned to
the pool if the bundle fails.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 456765)
Remaining Estimate: 0h
Time Spent: 10m
> 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: 2.18.0, 2.19.0, 2.21.0, 2.22.0
> Environment: Dataflow, Direct Runner on macOS Catalina.
> Reporter: Boris Shilov
> Assignee: Luke Cwik
> Priority: P2
> Labels: performance
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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