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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-4705) Add keep alive support to shared file locker
Date Fri, 30 Aug 2013 14:21:51 GMT

    [ https://issues.apache.org/jira/browse/AMQ-4705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754718#comment-13754718
] 

Gary Tully commented on AMQ-4705:
---------------------------------

currently keepAlive is a no op for the shared file locker. It does not delegate to channel
fileLock isValid so it does not see any failure of even the acquisiton by the slave.
having it check validity will help in this case and cause the master to die.
                
> Add keep alive support to shared file locker
> --------------------------------------------
>
>                 Key: AMQ-4705
>                 URL: https://issues.apache.org/jira/browse/AMQ-4705
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Message Store
>    Affects Versions: 5.8.0
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>              Labels: kahadb, netapp, nfsv4, shared-file-lock
>             Fix For: 5.9.0
>
>
> issue on nsfv4 with a master slave configuration, where both the slave and the master
could obtain a lock.
> The following events occurred:
> * master locks the file - does no more i/o to it – it's passive wrt the lock
> * slave asks every 10 seconds if it can get the lock nfs come back and say no, someone
has it
> * nfs dies not nicely
>  ** nfsv4 is stateful - no callback for locks. It has a grace period 30 seconds to let
all clients had locks reclaims locked
> * master does not realize it needs to reclaim the lock and continues under the assumption
it has the lock.
> * After 30 sec grace period, slave comes in and asks for the lock and it receives it.

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