[jira] [Created] (YARN-10672) All testcases in TestReservations are flaky

["Szilard Nemeth (Jira)" <ji...@apache.org>]

Szilard Nemeth created YARN-10672:
-------------------------------------

             Summary: All testcases in TestReservations are flaky
                 Key: YARN-10672
                 URL: https://issues.apache.org/jira/browse/YARN-10672
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Szilard Nemeth
            Assignee: Szilard Nemeth


Running a particular test in TestReservations 100 times never passes all the time.
For example, let's run testReservationNoContinueLook 100 times. For me, it produced 39 failed and 61 passed results.
Screenshot is attached.

Stacktrace: 
{code}
java.lang.AssertionError: 
Expected :2048
Actual   :0
<Click to see difference>

at org.junit.Assert.fail(Assert.java:89)
at org.junit.Assert.failNotEquals(Assert.java:835)
at org.junit.Assert.assertEquals(Assert.java:647)
at org.junit.Assert.assertEquals(Assert.java:633)
at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestReservations.testReservationNoContinueLook(TestReservations.java:642)
{code}

The test fails here: 
{code}
 // Start testing...
// Only AM
TestUtils.applyResourceCommitRequest(clusterResource,
    a.assignContainers(clusterResource, node_0,
        new ResourceLimits(clusterResource),
        SchedulingMode.RESPECT_PARTITION_EXCLUSIVITY), nodes, apps);
assertEquals(2 * GB, a.getUsedResources().getMemorySize());
{code}

With some debugging (patch attached), I realized that sometimes there are no registered nodes so the AM can't be allocated.



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