Github user bothejjms commented on the issue:
https://github.com/apache/zookeeper/pull/563
I have removed the test for now as I don't have a good way to test this
race condition. I can be reproduced easily by starting a server where the
globalOutstandingLimit is 1 and sending a lot exists requests. There is a good
chance that one session will stuck in a throttled state despite it has no
active requests.---
