[jira] [Created] (HDFS-10666) Über-jira: Unit tests should not depend on nondeterministic behavior using fixed sleep interval

["Mingliang Liu (JIRA)" <ji...@apache.org>]

Mingliang Liu created HDFS-10666:
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             Summary: Über-jira: Unit tests should not depend on nondeterministic behavior using fixed sleep interval
                 Key: HDFS-10666
                 URL: https://issues.apache.org/jira/browse/HDFS-10666
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: test
    Affects Versions: 3.0.0-alpha2
            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 {{MiniDFSCluster}}, e.g. {{trigger\{BlockReports,HeartBeats,DeletionReports\}}}
* fails fast if specific exceptions are caught
* _ad-hoc fixes_ (TBD)

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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