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Date: Tue, 28 Apr 2015 02:36:06 +0000 (UTC)
From: "Cameron McKenzie (JIRA)" <jira@apache.org>
To: dev@curator.apache.org
Message-ID: <JIRA.12754424.1415699338000.1675.1430188566185@Atlassian.JIRA>
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 <JIRA.12754424.1415699338981@arcas>
Subject: [jira] [Commented] (CURATOR-164) curator-x-discovery:
 unregisterService is not guaranteed to remove the service, due to
 reconnectListener concurrency issue
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    [ https://issues.apache.org/jira/browse/CURATOR-164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14516218#comment-14516218 ] 

Cameron McKenzie commented on CURATOR-164:
------------------------------------------

Calling restart() on the TestingServer instead of recreating a new instance seems to work ok.

> curator-x-discovery: unregisterService is not guaranteed to remove the service, due to reconnectListener concurrency issue
> --------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CURATOR-164
>                 URL: https://issues.apache.org/jira/browse/CURATOR-164
>             Project: Apache Curator
>          Issue Type: Bug
>          Components: Framework
>    Affects Versions: 2.7.0
>            Reporter: Rasmus Berg Palm
>            Assignee: Jordan Zimmerman
>            Priority: Critical
>             Fix For: 2.8.0
>
>
> In ServiceDiscoveryImpl:
> When unregistering a service, the reconnect listener might fire while deleting the path.
> This can cause a condition where the delete finishes successfully, the service is removed from services, and then the reRegisterServices completes successfully and the service is added back in ZK and in services, end result being that the service was not removed, even though unregisterService did not throw any exceptions. 
> Essentially the use of the internal 'services' cache makes for a nightmare of concurrency issues. I put this as critical as the library it's really not usable IMO.


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