xyuanlu commented on a change in pull request #1362:
URL: https://github.com/apache/helix/pull/1362#discussion_r490407050
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File path:
helix-core/src/main/java/org/apache/helix/messaging/handling/HelixStateTransitionHandler.java
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@@ -463,6 +442,36 @@ public void onError(Exception e, ErrorCode code, ErrorType
type) {
}
+ // Verify the fromState and current state of the stateModel.
+ private void validateStaleMessage (boolean isPreCheck) throws Exception {
+ String fromState = _message.getFromState();
+ String toState = _message.getToState();
+ String partitionName = _message.getPartitionName();
+
+ // state in _currentStateDelta uses current state from state model. It has
the
+ // most up-to-date. current state. In case currentState in stateModel is
null,
+ // partition is in initial state and we using it as current state.
+ // Defined in HelixStateMachineEngine.
+ String state = _currentStateDelta.getState(partitionName);
+
+ if (toState.equalsIgnoreCase(state)) {
+ // To state equals current state, we can just ignore the message
+ throw new HelixDuplicatedStateTransitionException(String
Review comment:
If it already been processed (in READ or UNPROCESSABLE state) then we
would ignore the ST message before this check. (line 856 in HelixTaskExecutor)
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