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https://issues.apache.org/jira/browse/ARTEMIS-2716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17362898#comment-17362898
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Francesco Nigro edited comment on ARTEMIS-2716 at 6/14/21, 5:33 PM:
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I'm going to:
# *remove the initial loop on primary start*: a primary start should succeed
or fail (with errors) and it's key for admin purposes. Admins are supposed to
check broker/machine state before restarting, so it's not just an automated
operation, but need to be supervised
# *deprecate/document allow-failback*: allow-failback == false turn a
failing-back primary into a backup that can just error out on failover errors.
In the classic replication failing-back master forget its Node ID if any error
happen on failover and restart as an empty backup. On broker restart, it got a
different NodeID and become live.
The latter is just enforce what the primary role is meant to be: mostly a live
candidate and an occasional backup, ready to failback ASAP.
This change is debatable and we can open a discussion on the PR about it too.
was (Author: nigrofranz):
I'm going to:
# *remove the initial loop on primary start*: a primary start should succeed or
fail (with errors) and it's key for admin purposes. Admins are supposed to
check broker/machine state before restarting, so it's not just an automated
operation, but need to be supervised
# *deprecate/document allow-failback*: allow-failback == false turn a
failing-back primary into a backup that can just error out on failover errors.
In the classic replication failing-back master forget its Node ID if any error
happen on failover and restart as an empty backup. On broker restart, it got a
different NodeID and become live.
> Implements pluggable Quorum Vote
> --------------------------------
>
> Key: ARTEMIS-2716
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2716
> Project: ActiveMQ Artemis
> Issue Type: New Feature
> Reporter: Francesco Nigro
> Assignee: Francesco Nigro
> Priority: Major
> Attachments: backup.png, primary.png
>
> Time Spent: 16h
> Remaining Estimate: 0h
>
> This task aim to ideliver a new Quorum Vote mechanism for artemis with the
> objectives:
> # to make it pluggable
> # to cleanly separate the election phase and the cluster member states
> # to simplify most common setups in both amount of configuration and
> requirements (eg "witness" nodes could be implemented to support single
> master-slave pairs)
> Post-actions to help people adopt it, but need to be thought upfront:
> # a clean upgrade path for current HA replication users
> # deprecate or integrate the current HA replication into the new version
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