Rakesh R created ZOOKEEPER-1858:
-----------------------------------
Summary: JMX checks - potential race conditions while stopping and
starting server
Key: ZOOKEEPER-1858
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1858
Project: ZooKeeper
Issue Type: Sub-task
Reporter: Rakesh R
Assignee: Rakesh R
I've noticed one potential case, where previously created zkclient session
immediately reconnected and publishing those beans while starting back the
zkserver and affecting zk#startup jmx checks.
Say, before stopping the server, there is a zk client session 0x143576544c50000
exists. While starting back the server, there could be possibility of seeing
the client sessions in jmx. Following is one such case. Please see below logs
which has taken from build
https://builds.apache.org/job/ZooKeeper-trunk-WinVS2008_java/642/
{code} [junit] 2014-01-03 09:18:12,809 [myid:] - INFO
[main-SendThread(127.0.0.1:11222):ClientCnxn$SendThread@1228] - Session
establishment complete on server 127.0.0.1/127.0.0.1:11222, sessionid =
0x143576544c50000, negotiated timeout = 30000
[junit] 2014-01-03 09:18:12,809 [myid:] - INFO
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:11222:ZooKeeperServer@617] - Established
session 0x143576544c50000 with negotiated timeout 30000 for client
/127.0.0.1:55377{code}
{code} [junit] 2014-01-03 09:18:12,391 [myid:] - INFO [main:JMXEnv@135] -
ensureOnly:[]
[junit] 2014-01-03 09:18:12,395 [myid:] - INFO [main:ClientBase@438] -
STARTING server
[junit] 2014-01-03 09:18:12,395 [myid:] - INFO [main:ClientBase@359] -
CREATING server instance 127.0.0.1:11222
[junit] 2014-01-03 09:18:12,395 [myid:] - INFO
[main:NIOServerCnxnFactory@94] - binding to port 0.0.0.0/0.0.0.0:11222
[junit] 2014-01-03 09:18:12,395 [myid:] - INFO [main:ClientBase@334] -
STARTING server instance 127.0.0.1:11222
[junit] 2014-01-03 09:18:19,030 [myid:] - INFO [main:JMXEnv@142] -
unexpected:org.apache.ZooKeeperService:name0=StandaloneServer_port-1,name1=Connections,name2=127.0.0.1,name3=0x143576544c50000
[junit] 2014-01-03 09:18:19,030 [myid:] - INFO [main:JMXEnv@142] -
unexpected:org.apache.ZooKeeperService:name0=StandaloneServer_port-1
[junit] 2014-01-03 09:18:19,030 [myid:] - INFO
[main:JUnit4ZKTestRunner$LoggedInvokeMethod@62] - TEST METHOD FAILED
testDefaultWatcherAutoResetWithChroot
[junit] junit.framework.AssertionFailedError: expected:<0> but was:<2>
[junit] at junit.framework.Assert.fail(Assert.java:47)
[junit] at junit.framework.Assert.failNotEquals(Assert.java:283)
[junit] at junit.framework.Assert.assertEquals(Assert.java:64)
[junit] at junit.framework.Assert.assertEquals(Assert.java:195)
[junit] at junit.framework.Assert.assertEquals(Assert.java:201)
[junit] at org.apache.zookeeper.test.JMXEnv.ensureOnly(JMXEnv.java:144)
[junit] at
org.apache.zookeeper.test.ClientBase.startServer(ClientBase.java:443)
[junit] at
org.apache.zookeeper.test.DisconnectedWatcherTest.testDefaultWatcherAutoResetWithChroot(DisconnectedWatcherTest.java:123)
[junit] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
{code}
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