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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