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Posted to dev@activemq.apache.org by "Torsten Mielke (JIRA)" <ji...@apache.org> on 2015/02/06 14:06:34 UTC
[jira] [Commented] (AMQ-4705) Add keep alive support to shared file
locker
[ https://issues.apache.org/jira/browse/AMQ-4705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14309094#comment-14309094 ]
Torsten Mielke commented on AMQ-4705:
-------------------------------------
Kind of follow up problem: AMQ-5568
> 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 of 30 seconds to let all clients that had locks reclaim them as 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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