Github user tumativ commented on a diff in the pull request:
https://github.com/apache/zookeeper/pull/689#discussion_r234415866
--- Diff:
zookeeper-server/src/main/java/org/apache/zookeeper/server/watch/WatcherCleaner.java
---
@@ -50,6 +50,8 @@
private volatile boolean stopped = false;
private final Object cleanEvent = new Object();
+ private final Object produserAndConsumerLock = new Object();
--- End diff --
done---
