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https://issues.apache.org/jira/browse/QPID-5409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Keith Wall resolved QPID-5409.
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Resolution: Fixed
> [Java Broker] Add support for multi-node HA cluster into BDB JE HA message
> store
> --------------------------------------------------------------------------------
>
> Key: QPID-5409
> URL: https://issues.apache.org/jira/browse/QPID-5409
> Project: Qpid
> Issue Type: Improvement
> Components: Java Broker
> Reporter: Alex Rudyy
> Fix For: 0.29
>
>
> The Java Qpid Broker currently supports only 2-nodes HA cluster with BDB JE
> message store. This JIRA aims to extend the current HA functionality and add
> support for multi-node HA cluster into BDB JE message store.
> Here is the list of high-level requirements for the HA multi-node support:
> # Only persistent messages are to be replicated. Transient messages will be
> lost on failover.
> # System must support clusters formed of an arbitrary number of nodes
> # System must continue to support clusters formed of two nodes. Existing
> public interfaces (notably JMX and existing virtualhost.xml format) must be
> retained (though may be deprecated) to allow existing users a convenient
> upgrade path.
> # System must allow a user to completely configure a new node via the
> web-management interface.
> # System must allow a user to monitor the nodes of the cluster in order to
> ascertain its health and perform day to day operations for via the
> web-management interface.
> ## expose statistics to allow the health of the cluster to be established
> (exact details to be determined: could be low level like DbPing or something
> more abstract)
> # System must be amenable to monitoring by third-party tools. The Broker
> should emit clear operational log messages as it transitions between states.
> These messages will be targeted at the end-user.
> # System must permit a mode of operation whereby the user (or other external
> agent) determines which virtual host becomes active following a store
> failover. In this mode of operation, following a failure, the store nodes in
> the cluster will elect a new master and the replica node will still sync-up
> with the new master node, but the system will not automatically mark the
> virtual host corresponding to the master as active. The user will then
> transfer the master to the desired location and make the virtualhost as
> active, allowing business traffic to recommence.
> # System must permit a mode of operation whereby the election of a store node
> as master also causes the corresponding virtual host to become active.
> # System must allow a user to influence a node's electability. These
> features will allow a customer whose cluster spans primary/DR sites to keep
> the active virtual hosts on the primary site in normal situations by
> favouring failover within the primary site.Specifically, this will allow:
> ## making a node unelectable - the node, even though it remains part of the
> cluster, will never be elected as master)
> ## making a node more likely to be elected master than other nodes - that
> is, if two or more nodes have an equally up to date set of transactions, the
> node with the highest priority will be elected master
> ## node electability settings must survive restart,
> ## node electability settings must be alterable at run-time.
> # System must allow a user to alter quorum. This feature is required in
> extraordinary situations where the system is required to continue to operate
> despite the loss of sufficient nodes to mean there is no longer simple
> majority.
> # System must allow the user to move the active virtual host from one node to
> another. This feature will help a user to restore a system to its BAU state
> following an extraordinary situation.
> # System must provide a user with a read-only view Queue when the underlying
> store is in a replica state. This must provide at least queue name and queue
> depth. This feature will allow a user to be able to see that replication is
> indeed functioning.
> # System must allow all HA operations to be allowed/denied according to rules
> in the ACL.
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