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https://issues.apache.org/jira/browse/BEAM-6389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17547551#comment-17547551
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Kenneth Knowles commented on BEAM-6389:
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This issue has been migrated to https://github.com/apache/beam/issues/19288
> Sources using Metrics.counter fail with 'Can't pickle ... DelegatingCounter'
> ----------------------------------------------------------------------------
>
> Key: BEAM-6389
> URL: https://issues.apache.org/jira/browse/BEAM-6389
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Affects Versions: 2.9.0
> Reporter: Matthew Willson
> Priority: P3
>
> This fails under Python 2.7 but works fine under Python 3 – looks like an
> easy fix.
> I am reading from a beam.io.utils.CountingSource:
> {{beam.io.Read(beam_io_utils.CountingSource(NUM_ROWS))}}
> This fails under python 2.7 with:
> Python exception: Can't pickle <class
> 'apache_beam.metrics.metric.DelegatingCounter'>: attribute lookup
> apache_beam.metrics.metric.DelegatingCounter failed
> Looks like this is because DelegatingCounter is actually an inner class
> defined inside apache_beam.metrics.metric.Metric. Under Python 3 pickling can
> resolve it under its qualified name
> apache_beam.metrics.metric.Metric.DelegatingCounter, but not in Python 2. A
> fix would be to move it to a top-level class in that module.
> This also applies to other sources which use Metrics.counter.
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