[JENKINS-55287] update exception warning for failure to load flow node (#589)

* update exception warning for failure to load flow node

* check durability first

* update error message

Author: Carroll Chiou

src/main/java/org/jenkinsci/plugins/workflow/cps/CpsFlowExecution.java

@@ -676,7 +676,14 @@ protected synchronized void initializeStorage() throws IOException {
                 h.setForDeserialize(storage.getNode(entry.getValue()));
                 heads.put(h.getId(), h);
             } else {
-                throw new IOException("Tried to load head FlowNodes for execution "+this.owner+" but FlowNode was not found in storage for head id:FlowNodeId "+entry.getKey()+":"+entry.getValue());
+                FlowDurabilityHint durabilitySetting = getDurabilityHint();
+                if (durabilitySetting != FlowDurabilityHint.MAX_SURVIVABILITY) {
+                    throw new AbortException("Cannot resume build because FlowNode " + entry.getValue() + " for FlowHead " + entry.getKey() + " could not be loaded. " +
+                            "This is expected to happen when using the " + durabilitySetting + " durability setting and Jenkins is not shut down cleanly. " +
+                            "Consider investigating to understand if Jenkins was not shut down cleanly or switching to the MAX_SURVIVABILITY durability setting which should prevent this issue in most cases.");
+                } else {
+                    throw new AbortException("Cannot resume build because FlowNode " + entry.getValue() + " for FlowHead " + entry.getKey() + " could not be loaded.");
+                }
             }
         }
         headsSerial = null;