While putting up patches for HADOOP-17169
<https://issues.apache.org/jira/browse/HADOOP-17169> I noticed that the
unit tests in trunk, specifically in HDFS, are incredibly unstable. Every
time I put up a new patch, 4-8 unit tests failed with failures that were
completely unrelated to the patch. I'm pretty confident in that since the
patch is simply changing variable names. I also ran the unit tests locally
and they would pass (or fail intermittently).

Is there an effort to stabilize the unit tests? I don't know if these are
bugs or if they're bad tests. But in either case, it's bad for the
stability of the project.

Eric

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