[jira] [Created] (HBASE-29566) TestPrefetch.testPrefetchWithDelay seems flakey

["Wellington Chevreuil (Jira)" <ji...@apache.org>]

Wellington Chevreuil created HBASE-29566:
--------------------------------------------

             Summary: TestPrefetch.testPrefetchWithDelay seems flakey
                 Key: HBASE-29566
                 URL: https://issues.apache.org/jira/browse/HBASE-29566
             Project: HBase
          Issue Type: Bug
            Reporter: Wellington Chevreuil


Noticed this TestPrefetch.testPrefetchWithDelay failing intermittently at branch-2.6 at least. 

{noformat}
java.lang.AssertionError: Prefetch delay has not been expired yet
	at org.junit.Assert.fail(Assert.java:89)
	at org.junit.Assert.assertTrue(Assert.java:42)
	at org.apache.hadoop.hbase.io.hfile.TestPrefetch.testPrefetchWithDelay(TestPrefetch.java:330)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
{noformat}

I believe the problem is in the while condition block:
{noformat}
...
    while (!reader.prefetchStarted()) {
      assertTrue("Prefetch delay has not been expired yet",
        getElapsedTime(startTime) < PrefetchExecutor.getPrefetchDelay());
    }
...
{noformat}
We are assuming prefetch will start right away the delay, but this may not be guaranteed.



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