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https://issues.apache.org/jira/browse/HDFS-4751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang updated HDFS-4751:
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Attachment: hdfs-4751-1.patch
Teensy patch attached. Synchronizing on the DFSClient should make it safe.
I couldn't repro this race locally, but this is a known issue in Mockito [1]
and this test has flaked on an Apache daily build before too.
[1]: https://code.google.com/p/mockito/issues/detail?id=203
> TestLeaseRenewer#testThreadName flakes
> --------------------------------------
>
> Key: HDFS-4751
> URL: https://issues.apache.org/jira/browse/HDFS-4751
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Affects Versions: 3.0.0, 2.0.5-beta
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Priority: Minor
> Attachments: hdfs-4751-1.patch
>
>
> Seen internally and during upstream trunk builds, error like the following:
> {noformat}
> Error Message:
> Unfinished stubbing detected here: -> at
> org.apache.hadoop.hdfs.TestLeaseRenewer.testThreadName(TestLeaseRenewer.java:197)
> E.g. thenReturn() may be missing. Examples of correct stubbing:
> when(mock.isOk()).thenReturn(true);
> when(mock.isOk()).thenThrow(exception);
> doThrow(exception).when(mock).someVoidMethod(); Hints: 1. missing
> thenReturn() 2. although stubbed methods may return mocks, you cannot inline
> mock creation (mock()) call inside a thenReturn method (see issue 53)
> Stack Trace:
> org.mockito.exceptions.misusing.UnfinishedStubbingException:
> Unfinished stubbing detected here:
> -> at
> org.apache.hadoop.hdfs.TestLeaseRenewer.testThreadName(TestLeaseRenewer.java:197)
> {noformat}
> I believe it's due to mocking while being concurrently accessed by another
> thread.
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