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https://issues.apache.org/jira/browse/BEAM-10549?focusedWorklogId=467101&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-467101
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ASF GitHub Bot logged work on BEAM-10549:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 06/Aug/20 06:59
Start Date: 06/Aug/20 06:59
Worklog Time Spent: 10m
Work Description: saavannanavati commented on a change in pull request
#12352:
URL: https://github.com/apache/beam/pull/12352#discussion_r466145176
##########
File path: sdks/python/apache_beam/runners/common.py
##########
@@ -1340,6 +1342,17 @@ def process_outputs(
self.per_element_output_counter.add_input(0)
return
+ if isinstance(results, (dict, str, unicode, bytes)):
+ results_type = type(results).__name__
+ raise TypeCheckError(
+ 'Returning a %s from a ParDo or FlatMap is '
+ 'discouraged. Please use list("%s") if you really '
+ 'want this behavior.' % (results_type, results))
+ elif not isinstance(results, collections.Iterable):
Review comment:
Out of curiosity, why is this check slow? Also, if we remove it, how
should we give the user the relevant error message?
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Issue Time Tracking
-------------------
Worklog Id: (was: 467101)
Time Spent: 2h (was: 1h 50m)
> Improve Runtime Type Checking Performance
> -----------------------------------------
>
> Key: BEAM-10549
> URL: https://issues.apache.org/jira/browse/BEAM-10549
> Project: Beam
> Issue Type: Improvement
> Components: sdk-py-core
> Reporter: Saavan Nanavati
> Assignee: Saavan Nanavati
> Priority: P2
> Time Spent: 2h
> Remaining Estimate: 0h
>
> The performance gain will come from moving the runtime type check from a
> decorator to OperationCounters.
>
> This has (2) improvements:
> # Cython optimizable
> # Sampling is a built-in feature
>
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