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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, 10:58 AM:
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I'm going to:
# remove the initial loop on primary start: a primary start that check for live
server isn't supposed to be a non-admin automatic restart, especially if the
broker was stopped because of some failure: need inspection of the state of the
journal/machine and an admin would likely prefer an all-or-nothing (re)start
operation
ie start broker and await failback (or just become a backup) to happen
# deprecate/document allow-failback: allow-failback == false turn a
failing-back primary into a backup that can just error out on failover errors
NOTE:
For the latter, in the classic replication a master acting as a backup just
forget its Node ID if any error happen during a failover and restart as an
empty backup.
It's dangerous because on broker restart, the broker got a different NodeID and
can always succeed to become live (!!).
was (Author: nigrofranz):
I'm going to:
# remove the initial loop on primary start: a primary start that check for live
server isn't supposed to be a non-admin automatic restart, especially if the
broker was stopped because of some failure: need inspection of the state of the
journal/machine and an admin would likely prefer an all-or-nothing (re)start
operation
ie start broker and await failback (or just become a backup) to happen
# deprecate allow-failback: allow-failback == false turn a failing-back primary
into a backup that can just error out on failover errors
NOTE:
For the latter, in the classic replication a master acting as a backup just
forget its Node ID if any error happen during a failover and restart as an
empty backup.
It's dangerous because on broker restart, the broker got a different NodeID and
can always succeed to 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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