[jira] [Commented] (ZOOKEEPER-1214) QuorumPeer should unregister only its previsously registered MBeans instead of use MBeanRegistry.unregisterAll() method.

["Michi Mutsuzaki (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-1214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494297#comment-13494297 ] 

Michi Mutsuzaki commented on ZOOKEEPER-1214:
--------------------------------------------

Ping!

--Michi
                
> QuorumPeer should unregister only its previsously registered MBeans instead of use MBeanRegistry.unregisterAll() method.
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-1214
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1214
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: quorum
>            Reporter: César Álvarez Núñez
>            Assignee: César Álvarez Núñez
>             Fix For: 3.5.0
>
>         Attachments: ZOOKEEPER-1214.patch, ZOOKEEPER-1214.patch, ZOOKEEPER-1214.patch
>
>
> When a QuorumPeer thread dies, it is unregistering *all* ZKMBeanInfo MBeans previously registered on its java process; including those that has not been registered by itself.
> It does not cause any side effect in production environment where each server is running on a separate java process; but fails when using "org.apache.zookeeper.test.QuorumUtil" to programmatically start up a zookeeper server ensemble and use its provided methods to force Disconnected, SyncConnected or SessionExpired events; in order to perform some basic/functional testing.
> Scenario:
> * QuorumUtil qU = new QuorumUtil(1); // It creates a 3 servers ensemble.
> * qU.startAll(); // Startup all servers: 1 Leader + 2 Followers
> * qU.shutdown\(i\); // i is a number from 1 to 3. It shutdown one server.
> The last method causes that a QuorumPeer will die, invoking the MBeanRegistry.unregisterAll() method.
> As a result, *all* ZKMBeanInfo MBeans are unregistered; including those belonging to the other QuorumPeer instances.
> When trying to restart previous server (qU.restart\(i\)) an AssertionError is thrown at MBeanRegistry.register(ZKMBeanInfo bean, ZKMBeanInfo parent) method, causing the QuorumPeer thread dead.
> To solve it:
> * MBeanRegistry.unregisterAll() method has been removed.
> * QuorumPeer only unregister its ZKMBeanInfo MBeans.

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