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https://issues.apache.org/jira/browse/BEAM-8088?focusedWorklogId=300776&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-300776
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ASF GitHub Bot logged work on BEAM-8088:
----------------------------------------
Author: ASF GitHub Bot
Created on: 24/Aug/19 23:20
Start Date: 24/Aug/19 23:20
Worklog Time Spent: 10m
Work Description: chadrik commented on pull request #9426: [BEAM-8088]
Track PCollection boundedness in python sdk
URL: https://github.com/apache/beam/pull/9426
As far as I can tell Python does not care about boundedness of PCollections
even in streaming mode, but external transforms _do_. In my ongoing effort to
get PubsubIO external transforms working I discovered that I could not generate
an unbounded write.
My pipeline looks like this:
```python
(
pipe
| 'PubSubInflow' >>
external.pubsub.ReadFromPubSub(subscription=subscription, with_attributes=True)
| 'PubSubOutflow' >> external.pubsub.WriteToPubSub(topic=OUTPUT_TOPIC,
with_attributes=True)
)
```
The PCollections returned from the external Read are Unbounded, as expected,
but python is responsible for creating the intermediate PCollection, which is
always Bounded, and thus external Write generated by Java is always Bounded.
If I'm on the right track here I'll make some tests. It's good enough to
get my external tests working.
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Issue Time Tracking
-------------------
Worklog Id: (was: 300776)
Remaining Estimate: 0h
Time Spent: 10m
> PCollection boundedness should be tracked and propagated
> --------------------------------------------------------
>
> Key: BEAM-8088
> URL: https://issues.apache.org/jira/browse/BEAM-8088
> Project: Beam
> Issue Type: Improvement
> Components: sdk-py-core
> Reporter: Chad Dombrova
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> As far as I can tell Python does not care about boundedness of PCollections
> even in streaming mode, but external transforms _do_. In my ongoing effort
> to get PubsubIO external transforms working I discovered that I could not
> generate an unbounded write.
> My pipeline looks like this:
> {code:python}
> (
> pipe
> | 'PubSubInflow' >>
> external.pubsub.ReadFromPubSub(subscription=subscription,
> with_attributes=True)
> | 'PubSubOutflow' >>
> external.pubsub.WriteToPubSub(topic=OUTPUT_TOPIC, with_attributes=True)
> )
> {code}
> The PCollections returned from the external Read are Unbounded, as expected,
> but python is responsible for creating the intermediate PCollection, which is
> always Bounded, and thus external Write is always Bounded.
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