jojochuang commented on code in PR #10648:
URL: https://github.com/apache/ozone/pull/10648#discussion_r3574814792
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hadoop-hdds/server-scm/src/test/java/org/apache/hadoop/hdds/scm/container/placement/algorithms/TestSCMContainerPlacementRackScatter.java:
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@@ -900,6 +919,34 @@ public void testAllNodesOnRackExcludedReducesRackCount2()
assertEquals(1, chosenNodes.size());
}
+ /**
+ * Within a single rack holding an emptier and a fuller datanode, the intra
+ * rack selection should prefer the less utilized node instead of choosing
+ * uniformly at random.
+ */
+ @Test
+ public void chooseNodeWithinRackPrefersLessUtilized() throws SCMException {
+ // Single rack with two datanodes.
+ setup(2, 2);
+ updateStorageInDatanode(0, 10, 90); // emptier node
+ updateStorageInDatanode(1, 90, 10); // fuller node
+
+ Map<DatanodeDetails, Integer> selectedCount = new HashMap<>();
+ selectedCount.put(datanodes.get(0), 0);
+ selectedCount.put(datanodes.get(1), 0);
+
+ for (int i = 0; i < 1000; i++) {
Review Comment:
A thousand times seems too much for a simple test. For the sake of saving
test run time, let's just run it 100 times:
```suggestion
for (int i = 0; i < 100; i++) {
```
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