dmvk commented on a change in pull request #18644:
URL: https://github.com/apache/flink/pull/18644#discussion_r800894514



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/dispatcher/Dispatcher.java
##########
@@ -630,10 +630,24 @@ JobManagerRunner createJobManagerRunner(JobGraph 
jobGraph, long initializationTi
 
     @Override
     public CompletableFuture<Acknowledge> cancelJob(JobID jobId, Time timeout) 
{
-        Optional<JobManagerRunner> maybeJob = getJobManagerRunner(jobId);
+        boolean isGloballyTerminated;
+        try {
+            isGloballyTerminated = jobResultStore.hasJobResultEntry(jobId);

Review comment:
       This makes me thing that the JRS interface should have been asynchronous 
as we can potentially block the RPC threads here 🤔 




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