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https://issues.apache.org/jira/browse/ZOOKEEPER-4251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17306499#comment-17306499
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Mohammad Arshad commented on ZOOKEEPER-4251:
--------------------------------------------
Failing test cases generally log error message as
{noformat}
java.lang.AssertionError: Unexpected bean exists! expected:<0> but was:<1>
at org.apache.zookeeper.test.WatcherTest.setUp(WatcherTest.java:84)
2021-03-11 05:38:43,909 [myid:] - INFO [main:JMXEnv@145] -
unexpected:org.apache.ZooKeeperService:name0=ReplicatedServer_id7,name1=replica.7,name2=Follower,name3=InMemoryDataTree
2021-03-11 05:38:43,909 [myid:] - ERROR [main:ZKTestCase$1@101] - FAILED
testWatcherCounte
{noformat}
JMX Bean name0=ReplicatedServer_id7 indicates that QuorumBean is not cleared
from a server with id 7. In test cases servers ids are starting with 1. So
this means this QuorumBean is not registered from test cases which is starting
7 servers. In whole zk I can find two test cases which are starting 7 servers
* ReconfigTest.testBulkReconfig
* ReconfigTest.testQuorumSystemChange
So definitely these test cases some how not cleaning up the QuorumBean.
I checked code, QuorumBean is cleaned when Quorum is shutdown
{code:java}
} finally {
LOG.warn("QuorumPeer main thread exited");
MBeanRegistry instance = MBeanRegistry.getInstance();
instance.unregister(jmxQuorumBean);
instance.unregister(jmxLocalPeerBean);
for (RemotePeerBean remotePeerBean : jmxRemotePeerBean.values()) {
instance.unregister(remotePeerBean);
}
jmxQuorumBean = null;
jmxLocalPeerBean = null;
jmxRemotePeerBean = null;
}
{code}
Above two test are shutting down the 7th servers, so this jmxQuorumBean from
7th servers should be cleaned up. But somehow this is not happening.
> Flaky test: org.apache.zookeeper.test.WatcherTest
> -------------------------------------------------
>
> Key: ZOOKEEPER-4251
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4251
> Project: ZooKeeper
> Issue Type: Sub-task
> Reporter: Mohammad Arshad
> Priority: Major
> Attachments: image-2021-03-16-12-24-27-480.png
>
>
> Flakyness=73.3% (11 / 15)
> !image-2021-03-16-12-24-27-480.png!
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