[ZOOKEEPER-2666] the watch function called many times when it should be called once

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.4.5
• Component/s: c client, server

Environment

ubuntu 14.04
zookeeper 3.4.5, it's installed by apt-get

• Assignee: Unassigned
• Reporter: ZHE CHEN
• Created: 16/Jan/17 05:51
• Updated: 23/Jan/17 22:38

Description

We have a service A, which has 2 instances A1 and A2.
We also have another 2 services, B and C. B has 2 instances B1 and B2. C has 2 instances C1 and C2.

A1 and A2 both register child watch for B and C. 2 individual watches, of course.

I restart B1 and C1 nearly at the same time. Then, theoretically A1 and A2
both should receive 2 events about the child change of service B and C.
However, the real result is, A1 received the 2 children changes of service B and C separately, A2 only received the children change of service B. Moreover, A2 got the children change of service B many many times when service B only changed once at that time (I add auto re-registration so A2 can receive the event more than once).

Till now, it only happened once. If it happens again, maybe I will provide some logs.