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From "Richard Martin (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-3654) JDBC Master/Slave : Slave cannot acquire lock when the master loose database connection.
Date Mon, 09 Jan 2012 17:22:40 GMT

    [ https://issues.apache.org/jira/browse/AMQ-3654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13182642#comment-13182642
] 

Richard Martin commented on AMQ-3654:
-------------------------------------

Thanks for the suggestion, i tried to set the property lockKeepAlivePeriod to 3s with this
configuration :

<jdbcPersistenceAdapter lockKeepAlivePeriod="3000"  dataDirectory="${activemq.base}/data"
dataSource="#oracle-ds" />

But it didn't work. When the network connection on the master is lost, the lock is still present
in the database. Any other idea which can solve the network failure test ?

Do you think, i can use the jdbc mode configured with useDatabaseLock="false" ? It seem to
be a master/master solution. We need to have a HA Solution with no message lost. With the
shared database, the message are stored in the same place. So if the master1 fail, the message
is stored in the database and our client switch to the master2 and he can consume the message.
Is it correct or i must use a Jdbc master/slave with useDatabaseLock="true" to have a HA solution
?
                
> JDBC Master/Slave : Slave cannot acquire lock when the master loose database connection.
> ----------------------------------------------------------------------------------------
>
>                 Key: AMQ-3654
>                 URL: https://issues.apache.org/jira/browse/AMQ-3654
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.5.0
>         Environment: Unix/Redhat 5.6
> ActiveMQ 5.5.0
> Oracle 10G
>            Reporter: Richard Martin
>            Priority: Critical
>             Fix For: 5.6.0
>
>
> Our configuration is JDBC Master/Slave with one master and one slave. When the master
is started, he acquire the database lock.
> Then when the slave is started, he wait to acquire the database lock. When the master
loose the network connection to the database, the lock in the database is not removed and
the slave connot acquire the database lock. In this situation, the master is unable to respond
to client (due to network failure)
> and the slave is not started because he can't acquire the database lock.
> When the master is killed, the slave can't acquire the database lock too. After the network
connection is restored, when the master starts, it cannot
> acquire lock to the database (because the lod lock is always present) so now, we have
two slaves and no master.
> Please, refer to this issue which is the same problem : AMQ-1958 

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