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https://issues.apache.org/jira/browse/BEAM-9934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17134410#comment-17134410
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Beam JIRA Bot commented on BEAM-9934:
-------------------------------------
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.
> Resolve differences in beam:metric:element_count:v1 implementations
> -------------------------------------------------------------------
>
> Key: BEAM-9934
> URL: https://issues.apache.org/jira/browse/BEAM-9934
> Project: Beam
> Issue Type: Bug
> Components: sdk-go, sdk-java-harness, sdk-py-harness
> Reporter: Luke Cwik
> Assignee: Luke Cwik
> Priority: P2
> Labels: stale-assigned
>
> The [element
> count|https://github.com/apache/beam/blob/d82d061aa303430f3d2853f397f3130fae6200cd/model/pipeline/src/main/proto/metrics.proto#L206]
> metric represents the number of elements within a PCollection and is
> interpreted differently across the Beam SDK versions.
> In the [Java
> SDK|https://github.com/apache/beam/blob/d82d061aa303430f3d2853f397f3130fae6200cd/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/data/PCollectionConsumerRegistry.java#L207]
> this represents the number of elements and includes how many windows those
> elements are in. This metric is incremented as soon as the element has been
> output.
> In the [Python
> SDK|https://github.com/apache/beam/blame/bfd151aa4c3aad29f3aea6482212ff8543ded8d7/sdks/python/apache_beam/runners/worker/opcounters.py#L247]
> this represents the number of elements and doesn't include how many windows
> those elements are in. The metric is also only incremented after the element
> has finished processing.
> The [Go
> SDK|https://github.com/apache/beam/blob/7097850daa46674b88425a124bc442fc8ce0dcb8/sdks/go/pkg/beam/core/runtime/exec/datasource.go#L260]
> does the same thing as Python.
> Traditionally in Dataflow this has always been the exploded window element
> count and the counter is incremented as soon as the element is output.
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