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https://issues.apache.org/jira/browse/BEAM-2988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546672#comment-17546672
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Kenneth Knowles commented on BEAM-2988:
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This issue has been migrated to https://github.com/apache/beam/issues/18518
> PubSub subscriptions automatically created in Python DirectRunner not
> reliably cleaned up
> -----------------------------------------------------------------------------------------
>
> Key: BEAM-2988
> URL: https://issues.apache.org/jira/browse/BEAM-2988
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Charles Chen
> Priority: P3
>
> In the Python DirectRunner, we attempt to garbage-collect
> automatically-created PubSub subscriptions here
> (https://github.com/apache/beam/blob/446f311746b74bdfb420ba71d76097d683fde9a1/sdks/python/apache_beam/runners/direct/transform_evaluator.py#L370).
> However, this mechanism may not succeed, since it is called on the __del__
> method when other references may have already been garbage-collected. We
> should further investigate the mechanism here and attempt to make it more
> reliable.
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