kaisun2000 commented on a change in pull request #924: WIP: fix
ZkHelixPropertyStore loses Zookeeper notification issue
URL: https://github.com/apache/helix/pull/924#discussion_r401187416
##########
File path:
zookeeper-api/src/main/java/org/apache/helix/zookeeper/zkclient/ZkClient.java
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@@ -1073,10 +1073,24 @@ protected void processStateChanged(WatchedEvent event)
{
fireStateChangedEvent(event.getState());
+ // This following is the case for sharedZkClient
if (!isManagingZkConnection()) {
+ /*
+ For SharedZkClient, we will not invoke fireNewSessionEvents and we will
invoke fireAllEvents
+ This keeps the same behavior as original SharedZkClient.
+ Invoking fireAllEvents is important to make sure HelixPropertyStore
working correctly.
+ */
+ if ((event.getState() == KeeperState.SyncConnected) &&
(!_isNewSessionEventFired) && (!"0"
+ .equals(getHexSessionId()))) {
+ fireAllEvents();
+ _isNewSessionEventFired = true;
+ } else if (event.getState() == KeeperState.Expired) {
+ _isNewSessionEventFired = false;
+ }
Review comment:
Good point.
Yes, this is another way to do it, thought about it.
Pro: concise
Con: hard to understand the intention. This may pave the way to another
hidden bug when people do refactoring next time, as how we get to this issue.
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