Marton Elek created HDDS-2214:
---------------------------------
Summary: TestSCMContainerPlacementRackAware has an intermittent
failure
Key: HDDS-2214
URL: https://issues.apache.org/jira/browse/HDDS-2214
Project: Hadoop Distributed Data Store
Issue Type: Improvement
Reporter: Marton Elek
Assignee: Marton Elek
For example from the nightly build:
{code:java}
<testcase name="testNoFallback[8]"
classname="org.apache.hadoop.hdds.scm.container.placement.algorithms.TestSCMContainerPlacementRackAware"
time="0.014">
<failure type="java.lang.AssertionError">java.lang.AssertionError
at org.junit.Assert.fail(Assert.java:86)
at org.junit.Assert.assertTrue(Assert.java:41)
at org.junit.Assert.assertTrue(Assert.java:52)
at
org.apache.hadoop.hdds.scm.container.placement.algorithms.TestSCMContainerPlacementRackAware.testNoFallback(TestSCMContainerPlacementRackAware.java:276)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
{code}
The problem is in the testNoFallback:
Let's say we have 11 nodes (from parameter) and we would like to choose 5 nodes
(hard coded in the test).
As the first two replicas are chosen from the same rack an all the other from
different racks it's not possible, so we except a failure.
But we have an assertion that the success count is at least 3. But this is true
only if the first two replicas are placed to the rack1 (5 nodes) or rack2
(5nodes). If the replica is placed to the rack3 (one node) it will fail
immediately:
Lucky case when we have success count > 3
{code:java}
rack1 -- node1
rack1 -- node2 -- FIRST replica
rack1 -- node3 -- SECOND replica
rack1 -- node4
rack1 -- node5
rack2 -- node6
rack2 -- node7 -- THIRD replica
rack2 -- node8
rack2 -- node9
rack2 -- node10
rack3 -- node11 -- FOURTH replica{code}
The specific case when we have success count == 1, as we can't choose the
second replica on rack3 (This is when the test is failing)
{code:java}
rack1 -- node1
rack1 -- node2
rack1 -- node3
rack1 -- node4
rack1 -- node5
rack2 -- node6
rack2 -- node7
rack2 -- node8
rack2 -- node9
rack2 -- node10
rack3 -- node11 -- FIRST replica{code}
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