Github user Randgalt commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/136#discussion_r132579217
  
    --- 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()) {
    +                Map<Watcher, Type> thisWatchers = 
watchTable.get(localPath);
    +                if (thisWatchers == null || thisWatchers.isEmpty()) {
    +                    continue;
                     }
    -                return null;
    -            }
    -            for (Watcher w : watchers) {
    -                HashSet<String> paths = watch2Paths.get(w);
    -                if (paths != null) {
    -                    paths.remove(path);
    +                Iterator<Entry<Watcher, Type>> iterator = 
thisWatchers.entrySet().iterator();
    +                while (iterator.hasNext()) {
    +                    Entry<Watcher, Type> entry = iterator.next();
    +                    Type entryType = entry.getValue();
    +                    Watcher watcher = entry.getKey();
    +                    if (entryType == Type.PERSISTENT) {
    +                        if ( type != EventType.NodeChildrenChanged ) {
    +                            watchers.add(watcher);
    --- End diff --
    
    The problem is that it makes 3.5.4 clients incompatible with 3.5.3 servers. 
That might make sense for 3.6.0 but it's unreasonable for .x.N release.


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