Github user afine commented on a diff in the pull request:
https://github.com/apache/zookeeper/pull/136#discussion_r132023758
--- Diff: src/java/main/org/apache/zookeeper/server/WatchManager.java ---
@@ -97,23 +102,44 @@ synchronized void removeWatcher(Watcher watcher) {
Set<Watcher> triggerWatch(String path, EventType type, Set<Watcher>
supress) {
WatchedEvent e = new WatchedEvent(type,
KeeperState.SyncConnected, path);
- HashSet<Watcher> watchers;
+ Set<Watcher> watchers = new HashSet<>();
+ PathIterator pathIterator = new PathIterator(path);
synchronized (this) {
- watchers = watchTable.remove(path);
- if (watchers == null || watchers.isEmpty()) {
- if (LOG.isTraceEnabled()) {
- ZooTrace.logTraceMessage(LOG,
- ZooTrace.EVENT_DELIVERY_TRACE_MASK,
- "No watchers for " + path);
+ for (String localPath : pathIterator.asIterable()) {
--- End diff --
I'm not sure if we should consider a potential performance impact for tall
data trees since we now always iterate all the way up every time a watcher is
triggered.
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