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src/tests/resource_offers_tests.cpp (line 77)
<https://reviews.apache.org/r/44989/#comment186925>

    Not yours, but do we actually need 10 agents here? I guess this also 
contributed to the slowdown mentioned.



src/tests/resource_offers_tests.cpp (line 102)
<https://reviews.apache.org/r/44989/#comment186926>

    Aren't you missing a Clock::settle() here?


- Joerg Schad


On March 18, 2016, 6:55 p.m., Greg Mann wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/44989/
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> 
> (Updated March 18, 2016, 6:55 p.m.)
> 
> 
> Review request for mesos, Adam B and Joerg Schad.
> 
> 
> Bugs: MESOS-4849
>     https://issues.apache.org/jira/browse/MESOS-4849
> 
> 
> Repository: mesos
> 
> 
> Description
> -------
> 
> Fixed a race in the resource offers tests.
> 
> Adding HTTP credentials to `StartSlave` in 'src/tests/mesos.cpp' has exposed 
> a race condition in ResourceOffersTest.ResourceOfferWithMultipleSlaves. The 
> test quickly runs `StartSlave` 10 times to create 10 agents. Under the 
> covers, `StartSlave` writes data to disk, and it seems that with the 
> additional data being written to disk for HTTP credentials, the filesystem 
> operations for one `StartSlave` call were not completing before the next call.
> 
> By settling the clock in between each invocation of `StartSlave`, this patch 
> fixes the race. The test is slower, but it is now reliable. Running the test 
> 3 times, the old implementation gives an average runtime of 265ms, while the 
> new one runs in an average of 359ms.
> 
> 
> Diffs
> -----
> 
>   src/tests/resource_offers_tests.cpp 
> 1cf292ee7931207596f8f06677386bef5965ef15 
> 
> Diff: https://reviews.apache.org/r/44989/diff/
> 
> 
> Testing
> -------
> 
> `GTEST_FILTER="ResourceOffersTest.ResourceOfferWithMultipleSlaves" 
> bin/mesos-tests.sh --gtest_repeat=1000 --gtest_break_on_failure=1` was used 
> to test on both OSX and Ubuntu 14.04.
> 
> 
> Thanks,
> 
> Greg Mann
> 
>

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