Justin Leet created METRON-728:
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Summary: ReaderSpliteratorTest fails randomly and extremely rarely
Key: METRON-728
URL: https://issues.apache.org/jira/browse/METRON-728
Project: Metron
Issue Type: Bug
Affects Versions: 0.3.1
Reporter: Justin Leet
See logs at
https://travis-ci.org/justinleet/incubator-metron/builds/203298348
I was able to reproduce this locally by calling
{{testActuallyParallel_mediumBatch}} in a {{while(true)}} loop. It can also
occur in {{testActuallyParallel_mediumBatchImplicitlyParallel()}}. I also had
to add
{{forkJoinPool.shutdownNow();}} to the end of the test, because otherwise OOM
errors occur.
My current assumption is that there's no guarantee you ever actually end up
running in parallel, so in extremely rare cases you just end up running one
thread.
I've had it vary wildly when I hit it, from within a second or two to running
for over a minute before an assertion failure occurs.
We could just alter the assertion to be {code}Assert.assertTrue(threads.size()
<= (int) Math.ceil(9.0 / 2) && threads.size() >= 1);{code}
This defeats the purpose of testing the parallelism a bit, but if there's no
guarantee we actually get parallelism there's not a fantastic way to test it.
Given the extreme rarity, we might want to just live with the fact that
occasionally {{threads.size() >= 1}} hits the threads.size() == 1 case on the
two tests.
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