jiajunwang commented on a change in pull request #1124:
URL: https://github.com/apache/helix/pull/1124#discussion_r456156072
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File path:
helix-core/src/main/java/org/apache/helix/controller/stages/CurrentStateComputationStage.java
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@@ -77,15 +84,19 @@ public void process(ClusterEvent event) throws Exception {
String instanceName = instance.getInstanceName();
String instanceSessionId = instance.getEphemeralOwner();
- // update pending messages
- Map<String, Message> messages = cache.getMessages(instanceName);
- Map<String, Message> relayMessages =
cache.getRelayMessages(instanceName);
- updatePendingMessages(instance, messages.values(), currentStateOutput,
relayMessages.values(), resourceMap);
-
// update current states.
Map<String, CurrentState> currentStateMap =
cache.getCurrentState(instanceName,
instanceSessionId);
updateCurrentStates(instance, currentStateMap.values(),
currentStateOutput, resourceMap);
+
+ Map<String, Map<String, Message>> existingStaleMessages =
cache.getStaleMessages();
+ currentStateOutput.setStaleMessageMap(existingStaleMessages);
+ // update pending messages
+ Map<String, Message> messages = cache.getMessages(instanceName);
+ Map<String, Message> relayMessages =
cache.getRelayMessages(instanceName);
+ updatePendingMessages(instance, messages.values(), currentStateOutput,
+ relayMessages.values(), resourceMap, existingStaleMessages);
+ cache.setStaleMessages(currentStateOutput.getStaleMessageMap());
Review comment:
I got the first point. Should be fine. Thanks for the explanation.
Regarding the leadership switch, the new leader won't know your cached
value. So it will treat the previous message ( "first M->S message") as not
stale. In general, if you have any logic depends on the cache, then the
leadership switch will be troublesome.
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