Abacn commented on code in PR #29979:
URL: https://github.com/apache/beam/pull/29979#discussion_r1450923209


##########
runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/DataflowExecutionStateSampler.java:
##########
@@ -117,7 +117,8 @@ public Optional<ActiveMessageMetadata> 
getActiveMessageMetadataForWorkId(String
     return Optional.ofNullable(null);
   }
 
-  public Map<String, IntSummaryStatistics> 
getProcessingDistributionsForWorkId(String workId) {
+  public synchronized Map<String, IntSummaryStatistics> 
getProcessingDistributionsForWorkId(
+      String workId) {
     if (!activeTrackersByWorkId.containsKey(workId)) {

Review Comment:
   ```suggestion
       // synchronized to avoid race condition of accessing 
activeTrackersByWorkId 
       if (!activeTrackersByWorkId.containsKey(workId)) {
   ```



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