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From "Patrick Hunt (JIRA)" <j...@apache.org>
Subject [jira] Updated: (ZOOKEEPER-117) threading issues in Leader election
Date Tue, 09 Sep 2008 18:11:44 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-117?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Patrick Hunt updated ZOOKEEPER-117:
-----------------------------------

    Status: Open  (was: Patch Available)

There is a potential race condition with this code:

1) say leader shutdown is called
2) shutdown will call cnxAcceptor.halt()
3) acceptor is currently blocked on accept (for up to 1 sec)
4) shutdown method completes, including shutting down entire followers set (followerhandlers)
5) accept call in acceptor returns true (socket != null)
6) acceptor now adds followerhandler to followers set

> threading issues in Leader election
> -----------------------------------
>
>                 Key: ZOOKEEPER-117
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-117
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: server
>            Reporter: Patrick Hunt
>            Assignee: Flavio Paiva Junqueira
>         Attachments: ZOOKEEPER-117.patch
>
>
> Leader.lead() creates a new thread that can never terminate (short of restarting vm)
> naked notifyall in lead() method - what is the condition variable? Best if set inside
the sync block

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