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Flaky test_missing_data_errant_worker #5961

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merged 1 commit into from
Mar 18, 2022
Merged

Flaky test_missing_data_errant_worker #5961

merged 1 commit into from
Mar 18, 2022

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crusaderky
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#5883 introduced a (to my superficial opinion) genuine use case where Worker.close() would never return, as demonstrated by test_missing_data_errant_worker which was hanging very frequently on the line await w1.close() after it.

@graingert could you review and merge today?
@fjetter feel free to reinstate and tweak after the release

@crusaderky crusaderky self-assigned this Mar 18, 2022
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graingert approved these changes Mar 18, 2022
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looks like a clean revert

#5883 introduced a (to my superficial opinion) genuine use case where Worker.close() would never return

I'm not sure what use case this is though

@crusaderky
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I'm not sure what use case this is though

w1 is being closed while there's a gather_dep in progress to copy data from w1 to w3

@jsignell jsignell mentioned this pull request Mar 18, 2022
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Unit Test Results

       12 files  +       2         12 suites  +2   5h 54m 16s ⏱️ + 1h 41m 20s
  2 665 tests  -        1    2 579 ✔️  -        4    80 💤  -     1  6 ❌ +4 
13 029 runs  +2 644  12 385 ✔️ +2 506  637 💤 +134  7 ❌ +4 

For more details on these failures, see this check.

Results for commit d72d87a. ± Comparison against base commit 2d3fddc.

@crusaderky crusaderky merged commit 0dab526 into dask:main Mar 18, 2022
@crusaderky crusaderky deleted the revert_5883 branch March 18, 2022 20:20
@fjetter fjetter mentioned this pull request Apr 8, 2022
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mrocklin pushed a commit that referenced this pull request Apr 29, 2022
@fjetter
Unblock event loop while waiting for ThreadpoolExecutor to shut down (#…
70e1fca 
…6091)

This reinstates #5883
which was reverted in #5961 / #5932

I could confirm the flakyness of `test_missing_data_errant_worker` after this change and am reasonably certain this is caused by #5910 which causes a closing worker to be restarted such that, even after `Worker.close` is done, the worker still appears to be partially up. 

The only reason I can see why this change promotes this behaviour is that if we no longer block the event loop while the threadpool is closing, this opens a much larger window for incoming requests to come in and being processed while close is running.

Closes #6239
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@graingert graingert graingert approved these changes

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Flaky test_missing_data_errant_worker
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