[jira] [Updated] (ZOOKEEPER-2435) miss event when the leader stop

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

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-2435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

BourneHan updated ZOOKEEPER-2435:
---------------------------------
    Attachment: zookeeper---221.out
                zookeeper---222.out

> miss event when the leader stop
> -------------------------------
>
>                 Key: ZOOKEEPER-2435
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2435
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: build
>    Affects Versions: 3.4.6
>            Reporter: BourneHan
>            Priority: Minor
>         Attachments: zookeeper---221.out, zookeeper---222.out
>
>
> Hi All, 
> In my projects, I use three ZooKeeper server as an ensemble:
> zk1 as a follower on 192.168.25.221,
> zk2 as a follower on 192.168.25.222,
> zk3 as the leader on 192.168.25.223.
> My two programs using ZooKeepers C client run on 192.168.25.221 and 192.168.25.222.
> When watched the ZOO_CONNECTED_STATE, my program will use the zookeeper to obtain a lock do the following:
> 1. Create a ZOO_EPHEMERAL | ZOO_SEQUENCE node under '/Lock/'.
> 2. Call getChildren( ) on the '/Lock/' node.
> 3. If the pathname created in step 1 has the lowest sequence number suffix, the program has the lock and do something,then release the lock simply delete the node created in step 1.
> 4. The program calls exists() with the watch flag set on the lowest sequence number node.
> 5. if exists( ) returns false, go to step 2. Otherwise, wait for a notification(ZOO_DELETED_EVENT) for the pathname from the previous step before going to step 2.
> When I stop a follower such as zk1/zk2, everything is ok, my programs on 192.168.25.221 and 192.168.25.222 do its work orderly under the lock's control.
> When I stop the leader such as zk3(I have restarted zk1/zk2), my program on 192.168.25.221 got the lock and release it normally, and my program on 192.168.25.222 detected existence of the node 
> created by the program on 192.168.25.221, but keep waiting and can't receive the ZOO_DELETED_EVENT notification.
> Does anyone else see the same problem？



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