dmvk commented on a change in pull request #18689:
URL: https://github.com/apache/flink/pull/18689#discussion_r805206533



##########
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,

Review comment:
       There is a similar method in the `Failure` class. I guess giving the 
parameter a more descriptive name would do the trick
   
   ```
       /**
        * Convert the failure into an {@link ExceptionHistoryEntry}.
        *
        * @param findExecutionFn Function that looks up additional information 
on the {@link
        *     ExecutionVertexID}, which can be used for constructing the {@link 
ExceptionHistoryEntry}.
        * @return The {@link ExceptionHistoryEntry} derived for this failure.
        */
       public abstract ExceptionHistoryEntry toExceptionHistoryEntry(
               Function<ExecutionVertexID, Execution> findExecutionFn);
   ```
   
   One additional thought about naming getters, it's good to distinguish 
between getters that return an actual value (`getXXX`) and getters that return 
an optional (`findXXX`).




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