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https://issues.apache.org/jira/browse/HDDS-6083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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István Fajth reassigned HDDS-6083:
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Assignee: István Fajth
> Fix flakyness of tests around nodefailures
> ------------------------------------------
>
> Key: HDDS-6083
> URL: https://issues.apache.org/jira/browse/HDDS-6083
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: István Fajth
> Assignee: István Fajth
> Priority: Major
>
> We haven't seen much occurance, but what we have seen a couple of times
> already is this:
> {code}
> Error:
> testWriteShouldSuccessIfLessThanParityNodesFail(org.apache.hadoop.ozone.client.TestOzoneECClient)
> Time elapsed: 0.116 s <<< FAILURE!
> java.lang.AssertionError: expected:<2> but was:<1>
> {code}
> Based on what I found I guess the problem can affect more things, but we have
> not seen much symptoms as we were so far lucky enough.
> It seems that the problem comes from [this
> line|https://github.com/apache/ozone/blob/HDDS-3816-ec/hadoop-ozone/client/src/test/java/org/apache/hadoop/ozone/client/MultiNodePipelineBlockAllocator.java#L55].
> If we are unlucky enough, and we get the same int twice, then we will have
> two pseudo DNs in the pipeline that gets the same client assigned. Which
> means that if we declare that node to fail, we get a secondary failure during
> failure handling, and the code is not prepared for that as of now, and also
> we swallow the exception in handleOutputStreamWrite inside ECKeyOutputStream,
> which we use from the handleStripeFailure method as well as during the
> regular write.
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