Github user maoling commented on the issue:
https://github.com/apache/zookeeper/pull/584
sorry ,too embarrassed.I was wrong about my previous opinion. look at my
thread-pool [unit
test](https://github.com/maoling/zookeeper/blob/ZOOKEEPER-3102/src/java/test/org/apache/zookeeper/server/DataTreeTest.java#L326)---
