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https://issues.apache.org/jira/browse/BEAM-3884?focusedWorklogId=113354&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-113354
]
ASF GitHub Bot logged work on BEAM-3884:
----------------------------------------
Author: ASF GitHub Bot
Created on: 19/Jun/18 20:23
Start Date: 19/Jun/18 20:23
Worklog Time Spent: 10m
Work Description: robertwb commented on a change in pull request #5685:
[BEAM-3884] Use Impulse primitive for Read.
URL: https://github.com/apache/beam/pull/5685#discussion_r196565056
##########
File path: sdks/python/apache_beam/transforms/core.py
##########
@@ -1894,3 +1895,26 @@ def _create_source(serialized_values, coder):
from apache_beam.transforms.create_source import _CreateSource
return _CreateSource(serialized_values, coder)
+
+
+class Impulse(PTransform):
+ """Impulse primitive."""
+
+ def expand(self, pbegin):
+ if not isinstance(pbegin, pvalue.PBegin):
+ raise TypeError(
+ 'Input to Impulse transform must be a PBegin but found %s' %
pbegin)
+ return pvalue.PCollection(pbegin.pipeline)
+
+ def get_windowing(self, inputs):
+ return Windowing(GlobalWindows())
+
+ def infer_output_type(self, unused_input_type):
+ return type(None)
Review comment:
Why? I'd have thought Void would be the obvious choice here. (Changed to
bytes for consistency.)
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Issue Time Tracking
-------------------
Worklog Id: (was: 113354)
Time Spent: 1h (was: 50m)
> Python SDK supports Impulse as a primitive transform
> ----------------------------------------------------
>
> Key: BEAM-3884
> URL: https://issues.apache.org/jira/browse/BEAM-3884
> Project: Beam
> Issue Type: Sub-task
> Components: sdk-py-core
> Reporter: Ben Sidhom
> Assignee: Robert Bradshaw
> Priority: Major
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Portable runners require Impulse to be the only root nodes of pipelines. The
> Python SDK should provide this for pipeline construction.
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