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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