jj314 commented on PR #63:
URL: 
https://github.com/apache/flink-connector-mongodb/pull/63#issuecomment-4295637144

   Hello @rmetzger thanks for running the workflow. 
   
   I think the reason for the failure in `writeConcernZero` test case might be 
that with write concern zero we don't wait for the write to be flushed and 
acknowledged. So when the assert happened the the write was not flushed yet and 
the document not visible. 
   
   According to [MongoDB 
documentation](https://www.mongodb.com/docs/manual/reference/configuration-options/#mongodb-setting-storage.journal.commitIntervalMs)
 the default commit interval is 100 ms. I saw in the logs that the time between 
the insert and the assertion was failure was 10 ms in github CI. Locally where 
I could not reproduce the test faillure, 143 ms pass between the insert and the 
end of the test.
   
   To make the test more consistent, I changed it so it checks repeatedly with 
a timeout of 10 seconds. Can you please try running the workflow again?


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