Github user aledsage commented on a diff in the pull request:

    https://github.com/apache/incubator-brooklyn/pull/571#discussion_r27614430
  
    --- Diff: 
policy/src/test/java/brooklyn/policy/ha/ServiceFailureDetectorTest.java ---
    @@ -312,6 +316,54 @@ public void 
testReportsFailureWhenAlreadyOnFireOnRegisteringPolicy() throws Exce
             assertHasEventEventually(HASensors.ENTITY_FAILED, 
Predicates.<Object>equalTo(e1), null);
         }
         
    +    @Test(groups="Integration") // Has a 1.5 second wait
    +    public void testRepublishedFailure() throws Exception {
    +        Duration republishPeriod = Duration.millis(100);
    +
    +        e1.addEnricher(EnricherSpec.create(ServiceFailureDetector.class)
    +                
.configure(ServiceFailureDetector.ENTITY_FAILED_REPUBLISH_TIME, 
republishPeriod));
    +            
    +        // Set the entity to healthy
    +        e1.setAttribute(TestEntity.SERVICE_UP, true);
    +        ServiceStateLogic.setExpectedState(e1, Lifecycle.RUNNING);
    +        EntityTestUtils.assertAttributeEqualsEventually(e1, 
Attributes.SERVICE_STATE_ACTUAL, Lifecycle.RUNNING);
    +        
    +        // Make the entity fail;
    +        ServiceStateLogic.ServiceProblemsLogic.updateProblemsIndicator(e1, 
"test", "foo");
    +        EntityTestUtils.assertAttributeEqualsEventually(e1, 
TestEntity.SERVICE_STATE_ACTUAL, Lifecycle.ON_FIRE);
    +        assertHasEventEventually(HASensors.ENTITY_FAILED, 
Predicates.<Object>equalTo(e1), null);
    +
    +        TimeUnit.SECONDS.sleep(1);
    +        
    +        // Now recover
    +        ServiceStateLogic.ServiceProblemsLogic.clearProblemsIndicator(e1, 
"test");
    +        EntityTestUtils.assertAttributeEqualsEventually(e1, 
TestEntity.SERVICE_STATE_ACTUAL, Lifecycle.RUNNING);
    +        assertHasEventEventually(HASensors.ENTITY_RECOVERED, 
Predicates.<Object>equalTo(e1), null);
    +        
    +        TimeUnit.MILLISECONDS.sleep(500);
    +
    +        //can't assert number of republish events due to jitter, warn 
below if it deviates from expectation
    +        assertTrue(events.size() > 2, "events="+events);
    +
    +        SensorEvent<FailureDescriptor> prevEvent = null;
    +        for (SensorEvent<FailureDescriptor> event : events) {
    +            if (prevEvent != null) {
    +                long repeatOffset = event.getTimestamp() - 
prevEvent.getTimestamp();
    +                long deviation = Math.abs(repeatOffset - 
republishPeriod.toMilliseconds());
    +                if (deviation > republishPeriod.toMilliseconds()/10 &&
    --- End diff --
    
    Same here: very time sensitive. We might well get a 10ms starvation of the 
required thread when running on a cloud test server.
    
    For this kind of time test (to avoid false negatives), I resorted to number 
that were more like republishPeriod being at least 1 second (rather than 
100ms), and accepting anything up to 500ms difference.
    
    If we start running our integration tests on apache hardware, we might find 
that will sometimes fail as well!


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