danny0405 commented on code in PR #13229:
URL: https://github.com/apache/hudi/pull/13229#discussion_r2084428098


##########
hudi-spark-datasource/hudi-spark/src/test/java/org/apache/hudi/table/action/rollback/TestMergeOnReadRollbackActionExecutor.java:
##########
@@ -110,52 +111,57 @@ public void testMergeOnReadRollbackActionExecutor(boolean 
isUsingMarkers) throws
     assertEquals(1, secondPartitionCommit2LogFiles.size());
     HoodieTable table = this.getHoodieTable(metaClient, cfg);
 
-    //2. rollback
-    HoodieInstant rollBackInstant = 
INSTANT_GENERATOR.createNewInstant(isUsingMarkers ? 
HoodieInstant.State.INFLIGHT : HoodieInstant.State.COMPLETED,
-        HoodieTimeline.DELTA_COMMIT_ACTION, "002");
-    BaseRollbackPlanActionExecutor mergeOnReadRollbackPlanActionExecutor =
-        new BaseRollbackPlanActionExecutor(context, cfg, table, "003", 
rollBackInstant, false,
-            cfg.shouldRollbackUsingMarkers(), false);
-    mergeOnReadRollbackPlanActionExecutor.execute().get();
-    MergeOnReadRollbackActionExecutor mergeOnReadRollbackActionExecutor = new 
MergeOnReadRollbackActionExecutor(
-        context,
-        cfg,
-        table,
-        "003",
-        rollBackInstant,
-        true,
-        false);
-    //3. assert the rollback stat
-    Map<String, HoodieRollbackPartitionMetadata> rollbackMetadata = 
mergeOnReadRollbackActionExecutor.execute().getPartitionMetadata();
-    assertEquals(2, rollbackMetadata.size());
-
-    for (Map.Entry<String, HoodieRollbackPartitionMetadata> entry : 
rollbackMetadata.entrySet()) {
-      HoodieRollbackPartitionMetadata meta = entry.getValue();
-      assertEquals(0, meta.getFailedDeleteFiles().size());
-      assertEquals(1, meta.getSuccessDeleteFiles().size());
+    try (SparkRDDWriteClient client = getHoodieWriteClient(cfg)) {
+      // create client so that timeline server starts
+      // Wait for embedded timeline server port to be ready
+      Thread.sleep(1000);

Review Comment:
   Can you elaborate why the timeline server is needed here?



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