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https://issues.apache.org/jira/browse/BEAM-14429?focusedWorklogId=769764&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-769764
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ASF GitHub Bot logged work on BEAM-14429:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 12/May/22 17:06
Start Date: 12/May/22 17:06
Worklog Time Spent: 10m
Work Description: y1chi merged PR #17609:
URL: https://github.com/apache/beam/pull/17609
Issue Time Tracking
-------------------
Worklog Id: (was: 769764)
Time Spent: 3.5h (was: 3h 20m)
> SyntheticUnboundedSource(with SDF) produce duplicate records when split with
> DEFAULT_DESIRED_NUM_SPLITS
> -------------------------------------------------------------------------------------------------------
>
> Key: BEAM-14429
> URL: https://issues.apache.org/jira/browse/BEAM-14429
> Project: Beam
> Issue Type: Bug
> Components: io-common
> Reporter: Yichi Zhang
> Assignee: Yichi Zhang
> Priority: P1
> Fix For: 2.40.0
>
> Time Spent: 3.5h
> Remaining Estimate: 0h
>
> With the default 20 split, the num records produced by
> Read.from(SyntheticUnboundedSource) is always larger than the numRecords
> specified. the more splits the more actual number records produced is off.
> And the Read step tends to take longer time with more splits.
> [https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/io/Read.java#L512]
> The issue is manifested with java LoadTests on dataflow runner v2.
> Initial suspicion is that duplicate source readers for the same restriction
> and checkpoint were created by multiple UnboundedSourceAsSDFWrapperFns.
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