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https://issues.apache.org/jira/browse/AMQ-5549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary Tully resolved AMQ-5549.
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Resolution: Fixed
Assignee: Gary Tully
Fix Version/s: 5.12.0
The window if closed via
https://git1-us-west.apache.org/repos/asf?p=activemq.git;a=commit;h=9bc602be
> Shared Filesystem Master/Slave using NFSv4 allows both brokers become active
> at the same time
> ---------------------------------------------------------------------------------------------
>
> Key: AMQ-5549
> URL: https://issues.apache.org/jira/browse/AMQ-5549
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker, Message Store
> Affects Versions: 5.10.1
> Environment: - CentOS Linux 6
> - OpenJDK 1.7
> - ActiveMQ 5.10.1
> Reporter: Heikki Manninen
> Assignee: Gary Tully
> Priority: Critical
> Fix For: 5.12.0
>
>
> Identical ActiveMQ master and slave brokers are installed on CentOS Linux 6
> virtual machines. There is a third virtual machine (also CentOS 6) providing
> an NFSv4 share for the brokers KahaDB.
> Both brokers are started and the master broker acquires file lock on the lock
> file and the slave broker sits in a loop and waits for a lock as expected.
> Also changing brokers work as expected.
> Once the network connection of the NFS server is disconnected both master and
> slave NFS mounts block and slave broker stops logging file lock re-tries.
> After a short while after bringing the network connection back the mounts
> come back and the slave broker is able to acquire the lock simultaneously.
> Both brokers accept client connections.
> In this situation it is also possible to stop and start both individual
> brokers many times and they are always able to acquire the lock even if the
> other one is already running. Only after stopping both brokers and starting
> them again is the situation back to normal.
> * NFS server:
> ** CentOS Linux 6
> ** NFS v4 export options: rw,sync
> ** NFS v4 grace time 45 seconds
> ** NFS v4 lease time 10 seconds
> * NFS client:
> ** CentOS Linux 6
> ** NFS mount options: nfsvers=4,proto=tcp,hard,wsize=65536,rsize=65536
> * ActiveMQ configuration (otherwise default):
> {code:xml}
> <persistenceAdapter>
> <kahaDB directory="${activemq.data}/kahadb">
> <locker>
> <shared-file-locker lockAcquireSleepInterval="1000"/>
> </locker>
> </kahaDB>
> </persistenceAdapter>
> {code}
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