Zookeeper Server's watch residue

[youweisheng]

Expected Behavior

According to Kazoo's documentation, after DataWatch returns False, the registered listener will be destroyed. Not only will Kazoo no longer trigger this listener, but when using wchp to view the zookeeper server, it should also not exist

Actual Behavior

According to Kazoo's documentation, after DataWatch returns False, the registered listener will be destroyed. However, in actual testing, it was found that although Kazoo will no longer trigger the listener, wchp can still find the listener in the zookeeper server

Snippet to Reproduce the Problem

COPY/PASTE the snippet here (omit any sensitive information)
from kazoo.client import KazooClient
import os
import time

zk_client = KazooClient(
hosts="127.0.0.1:9639",
timeout=4.0, # 连接超时时间
)
zk_client.start()
zk_client.create("/pos/test", b"123")
watch = zk_client.DataWatch("/pos/test")
@watch
def watch_node(data, stat):
if data:
return True
return False
os.system("echo wchp | nc 127.0.0.1 9639 | grep test")

print("wait...")
time.sleep(1)
zk_client.delete("/pos/test")
time.sleep(1)

os.system("echo wchp | nc 127.0.0.1 9639 | grep test")

Logs with logging in DEBUG mode

COPY/PASTE the result of the snippet here (omit any sensitive information)
[root@03f25057-e68e-59ba-b542-1864ef50dcc0 ~]# python3.6 test.py
/pos/test
wait...
/pos/test
[root@03f25057-e68e-59ba-b542-1864ef50dcc0 ~]#

Specifications

• Kazoo version: 2.9.0
• Result of pip list command:
• Zookeeper version:3.7.1
• Zookeeper configuration: put here any useful ZK configuration (authentication, encryption, number of ZK members, number of (concurrent?) clients, Java version, krb5 version, etc.)
  [root@03f25057-e68e-59ba-b542-1864ef50dcc0 conf]# cat zoo.cfg
  autopurge.purgeInterval=1
  initLimit=14
  syncLimit=2
  autopurge.snapRetainCount=40
  skipACL=yes
  snapCount=39000
  zookeeper.electionPortBindRetry=604800
  [zookeeper]=
  4lw.commands.whitelist=*
  tickTime=1500
  dataDir=/opt/zookeeper/data
  reconfigEnabled=true
  dataLogDir=/opt/zookeeper/datalog
  cnxTimeout=100
  preAllocSize=16384
  standaloneEnabled=false
  dynamicConfigFile=/opt/java/zookeeper/conf/zoo.cfg.dynamic.10000000c3

[root@03f25057-e68e-59ba-b542-1864ef50dcc0 conf]# cat zoo.cfg.dynamic.10000000c3

server.1=10.28.112.50:2888:3888:participant;0.0.0.0:9639

• Python version:3.6
• OS: centos