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https://issues.apache.org/jira/browse/BEAM-4177?focusedWorklogId=96809&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-96809
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ASF GitHub Bot logged work on BEAM-4177:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 30/Apr/18 18:37
            Start Date: 30/Apr/18 18:37
    Worklog Time Spent: 10m 
      Work Description: melap commented on issue #430: [BEAM-4177] Clarify 
thread contraint in Programming Guide 4.3.2
URL: https://github.com/apache/beam-site/pull/430#issuecomment-385489414
 
 
   @asfgit merge

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 96809)
    Time Spent: 0.5h  (was: 20m)

> 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: 0.5h
>  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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