richardstartin commented on a change in pull request #8443:
URL: https://github.com/apache/pinot/pull/8443#discussion_r840059632



##########
File path: 
pinot-core/src/test/java/org/apache/pinot/core/util/trace/TraceContextTest.java
##########
@@ -102,19 +102,21 @@ public void runJob() {
     for (Future future : futures) {
       future.get();
     }
-
+    // to check uniqueness of traceIds
+    Set<String> traceIds = new HashSet<>();
     Queue<TraceContext.Trace> traces = 
TraceContext.REQUEST_TO_TRACES_MAP.get(requestId);
     Assert.assertNotNull(traces);
     Assert.assertEquals(traces.size(), NUM_CHILDREN_PER_REQUEST + 1);
     for (TraceContext.Trace trace : traces) {
       // Trace Id is not deterministic because it relies on the order of 
runJob() getting called
       List<TraceContext.Trace.LogEntry> logs = trace._logs;
+      traceIds.add(trace._traceId);
       Assert.assertEquals(logs.size(), requestId + 1);
       for (TraceContext.Trace.LogEntry log : logs) {
         Assert.assertTrue(expectedTraces.contains(log.toJson().toString()));
       }
     }
-
+    Assert.assertEquals(traceIds.size(), NUM_CHILDREN_PER_REQUEST + 1);

Review comment:
       👍🏻 




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