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https://issues.apache.org/jira/browse/AMQ-4122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13585841#comment-13585841
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st.h commented on AMQ-4122:
---------------------------
Gary, I can confirm expected behavior when applying your changes. Thanks.
However, I would suggest the following changes:
- modify the documentation to show the correct configuration. currently it
shows {{lockKeepAlivePeriod="10000" lockAcquireSleepInterval="5000"}}, which
has been the config I used for the tests.
- in case lockAcquireSleepInterval < lockKeepAlivePeriod, at least log a
warning.
> Lease Database Locker failover broken
> -------------------------------------
>
> Key: AMQ-4122
> URL: https://issues.apache.org/jira/browse/AMQ-4122
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 5.7.0
> Environment: Java 7u9, SUSE 11, Mysql
> Reporter: st.h
> Assignee: Gary Tully
> Fix For: 5.8.0
>
> Attachments: activemq-kyle.xml, activemq.xml, activemq.xml,
> AMQ4122.patch, mysql.log
>
>
> We are using ActiveMQ 5.7.0 together with a mysql database and could not
> observe correct failover behavior with lease database locker.
> It seems that there is a race condition, which prevents the correct failover
> procedure.
> We noticed that when starting up two instances, both instance are becoming
> master.
> We did several test, including the following and could not observe intended
> functionality:
> - shutdown all instances
> - manipulate database lock that one node has lock and set expiry time in
> distance future
> - start up both instances. both instances are unable to acquire lock, as the
> lock hasn't expired, which should be correct behavior.
> - update the expiry time in database, so that the lock is expired.
> - first instance notices expired lock and becomes master
> - when second instance checks for lock, it also updates the database and
> becomes master.
> To my understanding the second instance should not be able to update the
> lock, as it is held by the first instance and should not be able to become
> master.
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