ChenSammi commented on a change in pull request #2591:
URL: https://github.com/apache/ozone/pull/2591#discussion_r698129289
##########
File path:
hadoop-hdds/server-scm/src/test/java/org/apache/hadoop/hdds/scm/container/placement/algorithms/TestSCMContainerPlacementRackAware.java
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@@ -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:
The networkTopology doesn't have the node healthy information currently.
There is chance that chooseDatanodes will throw exception after 3 internal
retries that it cannot find a proper node that is healthy if there are two many
unhealthy nodes in the cluster. One improvement I can think of is add the the
healthy status and storage space full status into the NetworkTopology. And I
agree with @sodonnel , we can discuss it in another JIRA.
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