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https://issues.apache.org/jira/browse/HDFS-10666?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mingliang Liu updated HDFS-10666:
---------------------------------
    Affects Version/s:     (was: 3.0.0-alpha2)
     Target Version/s: 3.0.0-alpha2
          Description: 
There have been dozens of intermittent failing unit tests because they depend 
on fixed-interval sleep to wait for conditions to reach before assertion. This 
umbrella jira is to replace these sleep statements with:
* {{GenericTestUtils.waitFor()}} to retry the conditions/assertions
* Trigger internal state change of code to test, e.g. for {{MiniDFSCluster}} we 
can trigger {BlockReports,HeartBeats,DeletionReports}
* Fails fast if specific exceptions are caught
* Coordinate the JUnit thread with activities of the internal threads
* _ad-hoc fixes_...

p.s. I don't know how closures in Java 8 comes into play but I'd like to see 
any effort.

  was:
There have been dozens of intermittent failing unit tests because they depend 
on fixed-interval sleep to wait for conditions to reach before assertion. This 
umbrella jira is to replace these sleep statements with:
* {{GenericTestUtils.waitFor()}} to retry the conditions/assertions
* Trigger internal state change of {{MiniDFSCluster}}, e.g. trigger 
{BlockReports,HeartBeats,DeletionReports}
* Fails fast if specific exceptions are caught
* Coordinate the JUnit thread with activities of the internal threads
* _ad-hoc fixes_...

p.s. I don't know how closures in Java 8 comes into play but I'd like to see 
any effort.


> Über-jira: Unit tests should not use fixed sleep interval to wait for 
> conditions
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-10666
>                 URL: https://issues.apache.org/jira/browse/HDFS-10666
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>            Reporter: Mingliang Liu
>            Assignee: Mingliang Liu
>
> There have been dozens of intermittent failing unit tests because they depend 
> on fixed-interval sleep to wait for conditions to reach before assertion. 
> This umbrella jira is to replace these sleep statements with:
> * {{GenericTestUtils.waitFor()}} to retry the conditions/assertions
> * Trigger internal state change of code to test, e.g. for {{MiniDFSCluster}} 
> we can trigger {BlockReports,HeartBeats,DeletionReports}
> * Fails fast if specific exceptions are caught
> * Coordinate the JUnit thread with activities of the internal threads
> * _ad-hoc fixes_...
> p.s. I don't know how closures in Java 8 comes into play but I'd like to see 
> any effort.



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