kerneltime commented on a change in pull request #2591:
URL: https://github.com/apache/ozone/pull/2591#discussion_r697880904



##########
File path: 
hadoop-hdds/server-scm/src/test/java/org/apache/hadoop/hdds/scm/container/placement/algorithms/TestSCMContainerPlacementRackAware.java
##########
@@ -524,4 +527,28 @@ public void 
testvalidateContainerPlacementSingleRackCluster() {
     assertTrue(stat.isPolicySatisfied());
     assertEquals(0, stat.misReplicationCount());
   }
+
+  @Test
+  public void testOutOfServiceNodesNotSelected() {
+    // Set all the nodes to out of service
+    for (DatanodeInfo dn : dnInfos) {
+      dn.setNodeStatus(new NodeStatus(DECOMMISSIONED, HEALTHY));
+    }
+
+    for (int i=0; i<10; i++) {
+      // Set a random DN to in_service and ensure it is always picked
+      int index = new Random().nextInt(dnInfos.size());
+      dnInfos.get(index).setNodeStatus(NodeStatus.inServiceHealthy());
+      try {
+        List<DatanodeDetails> datanodeDetails =
+            policy.chooseDatanodes(null, null, 1, 0, 0);
+        Assert.assertEquals(dnInfos.get(index), datanodeDetails.get(0));
+      } catch (SCMException e) {
+        // If we get SCMException: No satisfied datanode to meet the ... this 
is

Review comment:
       Should we add a check at the end to make sure that 
`policy.chooseDatanodes` worked at least once? Or retry the test until it 
worked once.




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