csudharsanan commented on code in PR #3043:
URL: https://github.com/apache/helix/pull/3043#discussion_r2125211887
##########
helix-core/src/main/java/org/apache/helix/controller/stages/MessageGenerationPhase.java:
##########
@@ -290,6 +315,113 @@ private void generateMessage(final Resource resource,
final BaseControllerDataPr
} // end of for-each-partition
}
+ /**
+ * Check if a state is a top state
+ * @param state The state to check
+ * @param stateModelDef The state model definition
+ * @return True if it's a top state, false otherwise
+ */
+ private boolean isTopState(String state, StateModelDefinition stateModelDef)
{
+ return stateModelDef.getTopState().contains(state);
+ }
+
+ /**
+ * Check if a state is a second top state
+ * @param state The state to check
+ * @param stateModelDef The state model definition
+ * @return True if it's a second top state, false otherwise
+ */
+ private boolean isSecondTopState(String state, StateModelDefinition
stateModelDef) {
+ return stateModelDef.getSecondTopStates().contains(state);
+ }
+
+ /**
+ * Check if a state transition is already in the pending messages
+ * @param resourceName The resource name
+ * @param partition The partition
+ * @param instanceName The instance name
+ * @param fromState The from state
+ * @param toState The to state
+ * @param pendingMessages The list of pending messages
+ * @return True if the state transition is already in pending messages,
false otherwise
+ */
+ private boolean isInPendingMessages(String resourceName, Partition
partition, String instanceName,
+ String fromState, String toState, List<Message> pendingMessages) {
+
+ for (Message message : pendingMessages) {
+ if (message.getResourceName().equals(resourceName)
+ && message.getPartitionName().equals(partition.getPartitionName())
+ && message.getTgtName().equals(instanceName) &&
message.getFromState().equals(fromState)
+ && message.getToState().equals(toState)) {
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ /**
+ * Check if a state transition is upward
+ * @param fromState The from state
+ * @param toState The to state
+ * @param stateModelDef The state model definition
+ * @return True if it's an upward state transition, false otherwise
+ */
+ private boolean isUpwardStateTransition(String fromState, String toState,
+ StateModelDefinition stateModelDef) {
+
+ if (fromState == null || toState == null) {
+ return false;
+ }
+
+ Map<String, Integer> statePriorityMap =
stateModelDef.getStatePriorityMap();
+
+ Integer fromStateWeight = statePriorityMap.get(fromState);
+ Integer toStateWeight = statePriorityMap.get(toState);
+
+ if (fromStateWeight == null || toStateWeight == null) {
+ return false;
+ }
+
+ return toStateWeight < fromStateWeight;
+ }
+
+ /**
+ * Get pending upward state transition messages from non-second top state to
second top or top
+ * state
+ * @param resourceName The resource name
+ * @param partition The partition
+ * @param currentStateOutput The current state output
+ * @param stateModelDef The state model definition
+ * @return List of pending messages for upward state transitions
+ */
+ private List<Message> getPendingUpwardStateTransitionMessages(String
resourceName,
+ Partition partition, CurrentStateOutput currentStateOutput,
+ StateModelDefinition stateModelDef) {
+ List<Message> pendingUpwardSTMessages = new ArrayList<>();
+
+ // Instance -> PendingMessage
+ Map<String, Message> pendingMessages =
+ currentStateOutput.getPendingMessageMap(resourceName, partition);
+
+ if (pendingMessages != null && !pendingMessages.isEmpty()) {
+ for (Message message : pendingMessages.values()) {
+ String fromState = message.getFromState();
+ String toState = message.getToState();
+
+ // Check if it's an upward state transition from non-second top state
to second top or top
+ // state
+ if (isUpwardStateTransition(fromState, toState, stateModelDef)
+ && !isSecondTopState(fromState, stateModelDef)
+ && (isSecondTopState(toState, stateModelDef) ||
isTopState(toState, stateModelDef))) {
Review Comment:
Both are valid scenarios, this implementation doesn't support adding
metadata for state models OFFLINE -> ONLINE and OFFLINE --> BOOTSTRAP (ST from
4th priority -> 3rd Priority).
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