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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/07/09 19:01:01 UTC
[jira] [Work logged] (BEAM-9629) JdbcIO seems to run out of
connections in the connection pool and freezes pipeline
[ https://issues.apache.org/jira/browse/BEAM-9629?focusedWorklogId=456765&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-456765 ]
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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