metaswirl commented on a change in pull request #18689:
URL: https://github.com/apache/flink/pull/18689#discussion_r804431631



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/adaptive/StateWithExecutionGraph.java
##########
@@ -148,6 +162,33 @@ public Logger getLogger() {
         return logger;
     }
 
+    protected Throwable extractError(TaskExecutionStateTransition 
taskExecutionStateTransition) {
+        Throwable cause = 
taskExecutionStateTransition.getError(userCodeClassLoader);
+        if (cause == null) {
+            cause = new FlinkException("Unknown failure cause. Probably 
related to FLINK-21376.");
+        }
+        return cause;
+    }
+
+    protected Optional<ExecutionVertexID> extractExecutionVertexID(
+            TaskExecutionStateTransition taskExecutionStateTransition) {
+        return 
executionGraph.getExecutionVertexId(taskExecutionStateTransition.getID());
+    }
+
+    protected static Optional<RootExceptionHistoryEntry> convertFailures(
+            Function<ExecutionVertexID, Optional<ExecutionVertex>> lookup,
+            List<Failure> failureCollection) {
+        if (failureCollection.isEmpty()) {
+            return Optional.empty();
+        }
+        Failure first = failureCollection.remove(0);
+        Set<ExceptionHistoryEntry> entries = new HashSet<>();
+        for (Failure failure : failureCollection) {
+            entries.add(failure.toExceptionHistoryEntry(lookup));

Review comment:
       Your comment made me think. The concurrentExceptions are stored by 
`RootHistoryExceptionEntry` as a set. As we cannot (do not want to) change 
this, we need to enforce it. I will change the code accordingly. 




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