yihua commented on code in PR #6383:
URL: https://github.com/apache/hudi/pull/6383#discussion_r946041860


##########
hudi-timeline-service/src/main/java/org/apache/hudi/timeline/service/handlers/marker/MarkerCreationDispatchingRunnable.java:
##########
@@ -66,8 +66,9 @@ public void run() {
 
     // Only fetch pending marker creation requests that can be processed,
     // i.e., that markers can be written to a underlying file
-    for (String markerDir : markerDirStateMap.keySet()) {
-      MarkerDirState markerDirState = markerDirStateMap.get(markerDir);
+    for (Map.Entry<String, MarkerDirState> entry : 
markerDirStateMap.entrySet()) {
+      String markerDir = entry.getKey();
+      MarkerDirState markerDirState = entry.getValue();

Review Comment:
   +1.  @novisfff could you use HUDI-4574 which is the original ticket for the 
timeline-server-based marker issue?  I was investigating the issue and 
identified the same thread-safe problem.



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