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From "Mike Drob (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-4343) DurabilityIT.testWriteSpeed can fail on slow hardware
Date Tue, 14 Jun 2016 17:40:27 GMT
Mike Drob created ACCUMULO-4343:
-----------------------------------

             Summary: DurabilityIT.testWriteSpeed can fail on slow hardware
                 Key: ACCUMULO-4343
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4343
             Project: Accumulo
          Issue Type: Bug
          Components: test
    Affects Versions: 1.7.1
            Reporter: Mike Drob
            Assignee: Mike Drob
             Fix For: 1.7.2, 1.8.0


When running the ITs, I will sometimes (~30%) get a failure that looks something like

{noformat}
java.lang.AssertionError: log should be faster than flush
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.assertTrue(Assert.java:41)
	at org.apache.accumulo.test.functional.DurabilityIT.testWriteSpeed(DurabilityIT.java:103)

2016-06-14 04:37:17,774 [functional.DurabilityIT] INFO : Attempt durations: [533, 573, 613,
664, 852]
2016-06-14 04:37:20,538 [functional.DurabilityIT] INFO : Attempt durations: [466, 470, 490,
494, 528]
2016-06-14 04:37:23,310 [functional.DurabilityIT] INFO : Attempt durations: [433, 464, 500,
512, 513]
2016-06-14 04:37:25,447 [functional.DurabilityIT] INFO : Attempt durations: [338, 345, 348,
383, 441]
sync 613 flush 490 log 500 none 348
{noformat}

I think this is a result of my hardware being oversubscribed, or just generally not running
on a beefy enough machine.

Instead of comparing medians, maybe we could compare mins, medians, and maxs, and assert that
at least two of the three are ordered? I don't want to play too many funny games with the
statistics here, but I also don't want the test to fail due to my specific hardware limitations.



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