Umbrella task: Clean up HDFS unit tests for timing-sensitive conditions,
improve both condition stimulators and condition detection loops
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Key: HDFS-1852
URL: https://issues.apache.org/jira/browse/HDFS-1852
Project: Hadoop HDFS
Issue Type: Test
Components: test
Affects Versions: 0.22.0
Reporter: Matt Foley
Both namenode and datanode have multiple background threads responsible for
detecting and responding to time-changing conditions, such as corrupt replicas,
under- or over-replicated blocks, etc. The unit tests that attempt to exercise
these threads often duplicate complex combinations of actions, and use "wait
for" or "wait until" loops to detect the results. The quality and robustness
of these loops vary widely, and some problematic ones cause recurring
intermittent false positives in Hudson. This is an umbrella task for a set of
bugs to be opened, to clean up these usages and move the common ones to
DFSTestUtil.
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