[jira] [Work started] (HDFS-10666) Über-jira: Unit tests should not use fixed sleep interval to wait for conditions

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

     [ https://issues.apache.org/jira/browse/HDFS-10666?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HDFS-10666 started by Mingliang Liu.
--------------------------------------------
> 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
>    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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