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https://issues.apache.org/jira/browse/BEAM-4177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16454322#comment-16454322
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John MacMillan commented on BEAM-4177:
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Added [Pull Request 430|https://github.com/apache/beam-site/pull/430]
> Clarify thread constraints in Programming Guide 4.3.2
> -----------------------------------------------------
>
> Key: BEAM-4177
> URL: https://issues.apache.org/jira/browse/BEAM-4177
> Project: Beam
> Issue Type: Improvement
> Components: website
> Reporter: John MacMillan
> Assignee: Melissa Pashniak
> Priority: Trivial
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In
> [4.3.2|https://beam.apache.org/documentation/programming-guide/#user-code-thread-compatibility],
> the sentence "Each instance of your function object is accessed by a single
> thread on a worker instance, unless you explicitly create your own threads"
> leaves some ambiguity about whether or not the instance is permanently tied
> to a single thread, or just restricted to being active on a single thread at
> a time.
> I suggest a minor change to:
> Each instance of your function object is accessed by a single thread at a
> time on a worker instance, unless you explicitly create your own threads.
> I will prepare a pull request with this change.
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