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https://issues.apache.org/jira/browse/BEAM-8557?focusedWorklogId=341296&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-341296
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ASF GitHub Bot logged work on BEAM-8557:
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                Author: ASF GitHub Bot
            Created on: 11/Nov/19 13:23
            Start Date: 11/Nov/19 13:23
    Worklog Time Spent: 10m 
      Work Description: sunjincheng121 commented on issue #9991: [BEAM-8557]Add 
log for the dropped unknown response
URL: https://github.com/apache/beam/pull/9991#issuecomment-552443631
 
 
   R: @kennknowles  I have updated the PR, is that make sense to you :) Welcome 
any feedback.
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 341296)
    Time Spent: 1h 50m  (was: 1h 40m)

> Clean up useless null check.
> ----------------------------
>
>                 Key: BEAM-8557
>                 URL: https://issues.apache.org/jira/browse/BEAM-8557
>             Project: Beam
>          Issue Type: Sub-task
>          Components: runner-core, sdk-java-harness
>            Reporter: sunjincheng
>            Assignee: sunjincheng
>            Priority: Major
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> I think we do not need null check here:
> [https://github.com/apache/beam/blob/master/runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/control/FnApiControlClient.java#L151]
> Because before the the `onNext` call, the `Future` already put into the queue 
> in `handle` method.
>  
> I found the test as follows:
> {code:java}
>  @Test
>  public void testUnknownResponseIgnored() throws Exception{code}
> I do not know why we need test this case? I think it would be better if we 
> throw the Exception for an UnknownResponse, otherwise, this may hidden a 
> potential bug. 
> Please correct me if there anything I misunderstand @kennknowles
>  



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